Division B
Section 9.23. Wood Frame Construction
Section 9.23. Wood Frame Construction Copy linkAdd bookmark
9.23.1. Application Copy linkAdd bookmark
9.23.1.1. Limitations (See Note A-9.23.1.1.) Copy linkAdd bookmark
(1)This Section applies to constructions where wall, floor and roof planes are generally comprised of lumber frames of small repetitive structural members, or engineered components, and where
(a)roof and wall planes are clad, sheathed or braced on at least one side,
(b)the small repetitive structural members are spaced not more than 600 mm o.c.,
(c)the constructions do not serve as foundations,
(d)the specified live load on supported subfloors and floor framing does not exceed 2.4 kPa, and
(e)the span of any structural member does not exceed 12.20 m.
(See Note A-9.23.1.1.(1))
(2)Where the conditions in Sentence (1) are exceeded for wood construction, the design of the framing and fastening shall conform to Subsection 4.3.1.
9.23.2. General Copy linkAdd bookmark
9.23.2.1. Strength and Rigidity Copy linkAdd bookmark
(1)All members shall be so framed, anchored, fastened, tied and braced to provide the necessary strength and rigidity.
9.23.2.2. Protection from Decay Copy linkAdd bookmark
(1)Ends of wood joists, beams and other members framing into masonry or concrete shall be treated to prevent decay where the bottom of the member is at or below ground level, or a 12 mm air space shall be provided at the end and sides of the member.
(2)Air spaces required in Sentence (1) shall not be blocked by insulation, vapour barriers or airtight materials.
9.23.2.3. Protection from Dampness Copy linkAdd bookmark
(1)Except as permitted in Sentence (2), wood framing members that are not pressure-treated with a wood preservative and that are supported on concrete in contact with the ground or fill shall be separated from the concrete by not less than 0.05 mm polyethylene film or Type S roll roofing.
(2)Dampproofing material referred to in Sentence (1) is not required where the wood member is at least 150 mm above the ground.
9.23.2.4. Connections to Preservative-Treated Wood Copy linkAdd bookmark
(1)Except as provided in Sentence (3), connectors in contact with preservative-treated wood shall be made of
(a)hot-dipped, zinc-coated galvanized steel with a coating weight not less than Z550 conforming to ASTM A653 / A653M, “Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process,”
(b)a material that provides an equivalent level of corrosion protection to that provided by the material described in Clause (a), or
(c)stainless steel.
(2)Fasteners used to attach the connectors referred to in Sentence (1) shall be made of
(a)galvanized steel coated with zinc in accordance with ASTM A153 / A153M, “Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware,” or
(b)a material that provides an equivalent level of performance and is compatible with the connector.
(3)Connectors and fasteners that are in contact with wood that has been treated with a disodium octaborate tetrahydrate (SBX (DOT)) or zinc borate preservative and is installed in a dry interior environment are permitted to be made of uncoated carbon steel. (See Note A-9.23.2.4.(3))
9.23.2.5. Lumber Copy linkAdd bookmark
(1)Lumber shall conform to the appropriate requirements in Subsection 9.3.2.
9.23.3. Fasteners and Connectors Copy linkAdd bookmark
9.23.3.1. Standards for Nails and Screws Copy linkAdd bookmark
(1)Except as provided in Sentence (2) and unless otherwise indicated, nails specified in this Section shall be common steel wire nails or common spiral nails, conforming to
(a)ASTM F1667, “Standard Specification for Driven Fasteners: Nails, Spikes and Staples,” or
(b)CSA B111, “Wire Nails, Spikes and Staples.”
(2)Nails used to comply with Table 9.23.3.4. shall have a diameter not less than that stated in Table 9.23.3.1. (See Note A-9.23.3.1.(2))
(3)Wood screws specified in this Section shall conform to ANSI/ASME B18.6.1., “Wood Screws (Inch Series)”. (See Note A-9.23.3.1.(3))
| Minimum Length of Nails, mm | Minimum Diameter of Nails, mm |
|---|---|
| 57 | 2.87 |
| 63 | 3.25 |
| 76 | 3.66 |
| 82 | 3.66 |
| 101 or greater | 4.88 |
9.23.3.2. Length of Nails Copy linkAdd bookmark
(1)All nails shall be long enough so that not less than half their required length penetrates into the second member.
9.23.3.3. Prevention of Splitting Copy linkAdd bookmark
(1)Splitting of wood members shall be minimized by staggering the nails in the direction of the grain and by keeping nails well in from the edges. (See Note A-9.23.3.3.(1))
9.23.3.4. Nailing of Framing Copy linkAdd bookmark
(1)Except as provided in Sentence (2), nailing of framing shall conform to Table 9.23.3.4.
(2)Where the bottom wall plate or sole plate of an exterior wall is not nailed to joists or blocking in conformance with Table 9.23.3.4., the exterior wall is permitted to be fastened to the floor framing by
(a)having plywood, OSB or waferboard sheathing extend down over floor framing and fastened to the floor framing by nails or staples conforming to Article 9.23.3.5., or
(b)tying the wall framing to the floor framing by 50 mm wide galvanized-metal strips
(i)50 mm wide,
(ii)not less than 0.41 mm thick,
(iii)spaced not more than 1.2 m apart, and
(iv)fastened at each end with at least two 63 mm nails.
| Construction Detail | Minimum Length of Nails, mm | Minimum Number or Maximum Spacing of Nails |
|---|---|---|
| Floor joist or blocking perpendicular to sill plate or top wall plate below – toe nail | 82 | 2 per floor joist or blocking |
| Rim joist, trimmer joist or blocking – supporting walls with required braced wall panels – to sill plate or top wall plate – toe nail | 82 | 150 mm o.c. |
| Wood or metal strapping to underside of floor joists | 57 | 2 |
| Cross-bridging to joists | 57 | 2 at each end |
| Double header or trimmer joists | 76 | 300 mm o.c. |
| Floor joist to stud (balloon construction) | 76 | 2 |
| Ledger strip to wood beam | 82 | 2 per joist |
| Joist to joist splice (See also Table 9.23.14.8.) | 76 | 2 at each end |
| Tail joist to adjacent header joist (end nailed) around openings | 82 | 5 |
| 101 | 3 | |
| Each header joist to adjacent trimmer joist (end nailed) around openings | 82 | 5 |
| 101 | 3 | |
| Stud to wall plate (each end) toe nail or end nail | 63 | 4 |
| 82 | 2 | |
| Doubled studs at openings, or studs at walls or wall intersections and corners | 76 | 750 mm o.c. |
| Doubled top wall plates(1) | 76 | 600 mm o.c. |
| Bottom wall plate or sole plate to floor joists, rim joists or blocking (exterior walls)(2) | 82 | 400 mm o.c. |
| Bottom wall plate or sole plate – in required braced wall panels – to floor joists, rim joists or blocking (exterior walls)(2) | 82 | 150 mm o.c. |
| Interior walls to framing or subflooring | 82 | 600 mm o.c. |
| Required braced wall panels – in interior walls – to framing above and below | 82 | 150 mm o.c. |
| Horizontal member over openings in non-loadbearing walls – each end | 82 | 2 |
| Lintels to studs | 82 | 2 at each end |
| Ceiling joist to plate – toe nail each end | 82 | 2 |
| Roof rafter, roof truss or roof joist to plate – toe nail(3) | 82 | 3 |
| Rafter plate to each ceiling joist | 101 | 2 |
| Rafter to joist (with ridge supported) | 76 | 3 |
| Rafter to joist (with ridge unsupported) | 76 | See Table 9.23.14.8. |
| Gusset plate to each rafter at peak | 57 | 4 |
| Rafter to ridge board – toe nail – end nail | 82 | 3 |
| Collar tie to rafter – each end | 76 | 3 |
| Collar tie lateral support to each collar tie | 57 | 2 |
| Jack rafter to hip or valley rafter | 82 | 2 |
| Roof strut to rafter | 76 | 3 |
| Roof strut to loadbearing wall – toe nail | 82 | 2 |
| 38 mm × 140 mm or less plank decking to support | 82 | 2 |
| Plank decking wider than 38 mm × 140 mm to support | 82 | 3 |
| 38 mm edge laid plank decking to support (toe nail) | 76 | 1 |
| 38 mm edge laid plank to each other | 76 | 450 mm o.c. |
| End-joist or end-rafter to built-up wall stud(4) | 76 | 5 or 8(5) |
Notes to Table 9.23.3.4.:
(1)
See Article 9.23.11.4. for requirements on the nailing of top plates in braced wall bands.
(2)
(3)
(4)
(5)
Where heavyweight construction is used in the roof of the space, at least 8 nails are required. (See Note A-9.23.13.2.(1)(a)(i))
9.23.3.5. Fastening for Sheathing or Subflooring Copy linkAdd bookmark
(1)Except as required by Sentences (2) to (4), fastening of sheathing and subflooring shall conform to Table 9.23.3.5.-A.
| Element | Minimum Length of Fasteners, mm | Minimum Number or Maximum Spacing of Fasteners | |||
|---|---|---|---|---|---|
| Common or Spiral Nails | Ring Thread Nails or Screws | Roofing Nails | Staples | ||
| Board lumber 184 mm or less wide | 51 | 45 | n/a | 51 | 2 per support |
| Board lumber more than 184 mm wide | 51 | 45 | n/a | 51 | 3 per support |
| Fibreboard sheathing up to 13 mm thick | n/a | n/a | 44 | 28 | 150 mm o.c. along edges and 300 mm o.c. along intermediate supports |
| Gypsum sheathing up to 13 mm thick | n/a | n/a | 44 | n/a | |
| Plywood, OSB or waferboard up to 10 mm thick | 51 | 45 | n/a | 38 | |
| Plywood, OSB or waferboard over 10 mm and up to 20 mm thick | 51 | 45 | n/a | 51 | |
| Plywood, OSB or waferboard over 20 mm and up to 25 mm thick | 57 | 51 | n/a | n/a | |
(2)Fastening of roof sheathing and sheathing in required braced wall panels shall conform to Table 9.23.3.5.-B, where
(a)the 1-in-50 hourly wind pressure (HWP) is equal to or greater than 0.8 kPa and less than 1.2 kPa and the seismic spectral acceleration, Sa(0.2), is not more than 0.90, or
(b)the seismic spectral acceleration, Sa(0.2), is greater than 0.70 and not more than 0.90.
(3)Fastening of roof sheathing and sheathing in required braced wall panels shall conform to Table 9.23.3.5.-C, where
(a)the 1-in-50 hourly wind pressure (HWP) is equal to or greater than 0.8 kPa and less than 1.2 kPa and the spectral acceleration, Sa(0.2), is not more than 1.8, or
(b)the seismic spectral acceleration, Sa(0.2), is greater than 0.90 and not more than 1.8.
(4)Fastening of sheathing shall conform to Part 4,
(a)where the 1-in-50 hourly wind pressure is equal to or greater than 1.2 kPa, or
(b)for required braced wall panels, where the seismic spectral acceleration, Sa(0.2), is greater than 1.8.
(5)Staples shall not be less than 1.6 mm in diameter or thickness, with not less than a 9.5 mm crown driven with the crown parallel to framing.
| Element | Minimum Length of Fasteners, mm | Minimum Number or Maximum Spacing of Fasteners | ||
|---|---|---|---|---|
| Common, Spiral or Ring Thread Nails | Screws | 14-gauge Staples | ||
| Board lumber 184 mm or less wide | 63 | 51 | 63 | 2 per support |
| Board lumber more than 184 mm wide | 63 | 51 | 63 | 3 per support |
| Plywood, OSB or waferboard up to 20 mm thick(1) | 63 | 51 | 63 | 150 mm o.c. along edges and 300 mm o.c. along intermediate supports; and for roof sheathing where HWP is equal to or greater than 0.8 kPa and less than 1.2 kPa, 50 mm o.c. within 1 m of the edges of the roof |
| Plywood, OSB or waferboard over 20 mm and up to 25 mm thick | 63 | 57 | n/a | |
Notes to Table 9.23.3.5.-B:
(1)
See Note A-Table 9.23.3.5.-B.
| Element | Minimum Length of Fasteners, mm | Minimum Number or Maximum Spacing of Fasteners | |
|---|---|---|---|
| Common, Spiral or Ring Thread Nails | Screws | ||
| Plywood, OSB or waferboard up to 20 mm thick(1) | 63 | 51 | 75 mm o.c. along edges and 300 mm o.c. along intermediate supports; and for roof sheathing where 1-in-50 HWP is equal to or greater than 0.8 kPa and less than 1.2 kPa, 50 mm o.c. within 1 m of the edges of the roof |
| Plywood, OSB or waferboard over 20 mm and up to 25 mm thick | 63 | 57 | |
Notes to Table 9.23.3.5.-C:
(1)
See Note A-Table 9.23.3.5.-B.
(6)Roofing nails for the attachment of fibreboard or gypsum sheathing shall not be less than 3.2 mm in diameter with a minimum head diameter of 11.1 mm.
(7)Flooring screws shall not be less than 3.2 mm in diameter.
(7.1)Where roof sheathing supports are spaced at more than 400 mm o.c., the maximum spacing of fasteners for roof sheathing shall be 150 mm along edges and intermediate supports.
(8)The edges of sheathing in a braced wall panel shall be supported and fastened to wood blocking where
(a)the seismic spectral acceleration, Sa(0.2), is greater than 1.2, or
(b)the braced wall panel supports more than a roof of lightweight construction.
9.23.4. Maximum Spans Copy linkAdd bookmark
9.23.4.1. Application Copy linkAdd bookmark
(1)Spans provided in this Subsection for joists, beams and lintels supporting floors shall apply only where
(a)the floors serve residential areas as described in Table 4.1.5.3., or
(b)the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)Spans for joists, beams and lintels supporting floors shall be determined according to Subsection 4.1.3. where the supported floors
(a)serve other than residential areas, or
(b)support a uniform live load in excess of that specified for residential areas.
9.23.4.2. Spans for Joists, Rafters and Beams (See Note A-9.23.4.2.) Copy linkAdd bookmark
(1)Except as required in Sentence (2) and Article 9.23.14.10., spans for wood joists and rafters shall conform to the spans shown in Span Tables 9.23.4.2.-A to 9.23.4.2-G for the uniform live loads shown in the Tables. (See Article 9.4.2.2.)
(2)Spans for floor joists that are not selected from Span Tables 9.23.4.2.-A and 9.23.4.2-B and that are required to be designed for the same loading conditions, shall not exceed the design requirements for uniform loading and vibration criteria. (See Note A-9.23.4.2.(2))
(3)Spans for built-up wood and glued-laminated timber floor beams shall conform to the spans in Span Tables 9.23.4.2.-H to 9.23.4.2-K. (See Article 9.4.2.2.)
(4)Spans for roof ridge beams shall conform to the spans in Span Table 9.23.4.2.-L for the uniform snow load shown. (See Articles 9.4.2.2. and 9.23.14.8.)
| Commercial Designation | Grade | Joist Size, mm | Maximum Span, m | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| With Strapping(2) | With Bridging | With Strapping(2) and Bridging | |||||||||
| Joist Spacing, mm | Joist Spacing, mm | Joist Spacing, mm | |||||||||
| 300 | 400 | 600 | 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 2.13 | 1.97 | 1.73 | 2.19 | 1.99 | 1.73 | 2.19 | 1.99 | 1.73 |
| 38 × 140 | 3.23 | 3.07 | 2.73 | 3.44 | 3.12 | 2.73 | 3.44 | 3.12 | 2.73 | ||
| 38 × 184 | 3.88 | 3.69 | 3.51 | 4.18 | 3.92 | 3.59 | 4.37 | 4.07 | 3.59 | ||
| 38 × 235 | 4.57 | 4.34 | 4.13 | 4.86 | 4.57 | 4.29 | 5.05 | 4.70 | 4.39 | ||
| 38 × 286 | 5.21 | 4.95 | 4.71 | 5.49 | 5.16 | 4.85 | 5.66 | 5.28 | 4.92 | ||
| No. 1 and No. 2 | 38 × 89 | 2.00 | 1.85 | 1.66 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | |
| 38 × 140 | 3.09 | 2.91 | 2.62 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.62 | ||
| 38 × 184 | 3.71 | 3.53 | 3.36 | 4.00 | 3.76 | 3.44 | 4.19 | 3.90 | 3.44 | ||
| 38 × 235 | 4.38 | 4.16 | 3.96 | 4.66 | 4.38 | 4.11 | 4.84 | 4.51 | 4.20 | ||
| 38 × 286 | 4.99 | 4.75 | 4.52 | 5.26 | 4.94 | 4.65 | 5.43 | 5.06 | 4.72 | ||
| No. 3 | 38 × 89 | 1.90 | 1.69 | 1.38 | 1.95 | 1.69 | 1.38 | 1.95 | 1.69 | 1.38 | |
| 38 × 140 | 2.78 | 2.41 | 1.97 | 2.78 | 2.41 | 1.97 | 2.78 | 2.41 | 1.97 | ||
| 38 × 184 | 3.38 | 2.93 | 2.39 | 3.38 | 2.93 | 2.39 | 3.38 | 2.93 | 2.39 | ||
| 38 × 235 | 4.14 | 3.58 | 2.93 | 4.14 | 3.58 | 2.93 | 4.14 | 3.58 | 2.93 | ||
| 38 × 286 | 4.80 | 4.16 | 3.39 | 4.80 | 4.16 | 3.39 | 4.80 | 4.16 | 3.39 | ||
| Construction | 38 × 89 | 1.90 | 1.77 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | |
| Standard | 38 × 89 | 1.81 | 1.63 | 1.33 | 1.88 | 1.63 | 1.33 | 1.88 | 1.63 | 1.33 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 2.08 | 1.93 | 1.71 | 2.16 | 1.96 | 1.71 | 2.16 | 1.96 | 1.71 |
| 38 × 140 | 3.18 | 3.03 | 2.69 | 3.39 | 3.08 | 2.69 | 3.39 | 3.08 | 2.69 | ||
| 38 × 184 | 3.82 | 3.64 | 3.46 | 4.12 | 3.87 | 3.54 | 4.31 | 4.02 | 3.54 | ||
| 38 × 235 | 4.50 | 4.28 | 4.08 | 4.80 | 4.51 | 4.23 | 4.98 | 4.64 | 4.33 | ||
| 38 × 286 | 5.14 | 4.89 | 4.65 | 5.42 | 5.09 | 4.78 | 5.59 | 5.21 | 4.86 | ||
| No. 1 and No. 2 | 38 × 89 | 2.00 | 1.85 | 1.66 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | |
| 38 × 140 | 3.09 | 2.91 | 2.62 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.62 | ||
| 38 × 184 | 3.71 | 3.53 | 3.36 | 4.00 | 3.76 | 3.44 | 4.19 | 3.90 | 3.44 | ||
| 38 × 235 | 4.38 | 4.16 | 3.96 | 4.66 | 4.38 | 4.11 | 4.84 | 4.51 | 4.20 | ||
| 38 × 286 | 4.99 | 4.75 | 4.52 | 5.26 | 4.94 | 4.65 | 5.43 | 5.06 | 4.72 | ||
| No. 3 | 38 × 89 | 1.90 | 1.77 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | |
| 38 × 140 | 2.99 | 2.78 | 2.43 | 3.19 | 2.90 | 2.43 | 3.19 | 2.90 | 2.43 | ||
| 38 × 184 | 3.60 | 3.42 | 2.95 | 3.88 | 3.61 | 2.95 | 4.06 | 3.61 | 2.95 | ||
| 38 × 235 | 4.24 | 4.03 | 3.61 | 4.51 | 4.24 | 3.61 | 4.68 | 4.37 | 3.61 | ||
| 38 × 286 | 4.84 | 4.60 | 4.19 | 5.10 | 4.79 | 4.19 | 5.26 | 4.90 | 4.19 | ||
| Construction | 38 × 89 | 1.90 | 1.77 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | |
| Standard | 38 × 89 | 1.81 | 1.68 | 1.39 | 1.96 | 1.71 | 1.39 | 1.96 | 1.71 | 1.39 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 1.95 | 1.81 | 1.64 | 2.06 | 1.87 | 1.64 | 2.06 | 1.87 | 1.64 |
| 38 × 140 | 3.05 | 2.85 | 2.57 | 3.24 | 2.95 | 2.57 | 3.24 | 2.95 | 2.57 | ||
| 38 × 184 | 3.66 | 3.48 | 3.31 | 3.94 | 3.70 | 3.38 | 4.12 | 3.84 | 3.38 | ||
| 38 × 235 | 4.31 | 4.10 | 3.90 | 4.59 | 4.31 | 4.05 | 4.76 | 4.44 | 4.14 | ||
| 38 × 286 | 4.91 | 4.67 | 4.45 | 5.18 | 4.87 | 4.57 | 5.34 | 4.98 | 4.64 | ||
| No. 1 and No. 2 | 38 × 89 | 1.86 | 1.72 | 1.58 | 1.99 | 1.81 | 1.58 | 1.99 | 1.81 | 1.58 | |
| 38 × 140 | 2.92 | 2.71 | 2.49 | 3.14 | 2.85 | 2.49 | 3.14 | 2.85 | 2.49 | ||
| 38 × 184 | 3.54 | 3.36 | 3.20 | 3.81 | 3.58 | 3.27 | 3.99 | 3.72 | 3.27 | ||
| 38 × 235 | 4.17 | 3.96 | 3.77 | 4.44 | 4.17 | 3.92 | 4.60 | 4.29 | 4.00 | ||
| 38 × 286 | 4.75 | 4.52 | 4.30 | 5.01 | 4.71 | 4.42 | 5.17 | 4.82 | 4.49 | ||
| No. 3 | 38 × 89 | 1.81 | 1.68 | 1.55 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.55 | |
| 38 × 140 | 2.84 | 2.64 | 2.43 | 3.08 | 2.80 | 2.43 | 3.08 | 2.80 | 2.43 | ||
| 38 × 184 | 3.47 | 3.30 | 2.95 | 3.74 | 3.52 | 2.95 | 3.92 | 3.61 | 2.95 | ||
| 38 × 235 | 4.09 | 3.89 | 3.61 | 4.36 | 4.09 | 3.61 | 4.52 | 4.22 | 3.61 | ||
| 38 × 286 | 4.67 | 4.44 | 4.19 | 4.92 | 4.62 | 4.19 | 5.08 | 4.73 | 4.19 | ||
| Construction | 38 × 89 | 1.81 | 1.68 | 1.55 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.55 | |
| Standard | 38 × 89 | 1.70 | 1.58 | 1.44 | 1.88 | 1.71 | 1.44 | 1.88 | 1.71 | 1.44 | |
| Northern Species (includes any Canadian Species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 1.65 | 1.53 | 1.42 | 1.84 | 1.68 | 1.46 | 1.84 | 1.68 | 1.46 |
| 38 × 140 | 2.59 | 2.41 | 2.24 | 2.90 | 2.63 | 2.30 | 2.90 | 2.63 | 2.30 | ||
| 38 × 184 | 3.27 | 3.11 | 2.94 | 3.52 | 3.31 | 3.03 | 3.69 | 3.44 | 3.03 | ||
| 38 × 235 | 3.85 | 3.66 | 3.48 | 4.10 | 3.85 | 3.62 | 4.26 | 3.97 | 3.70 | ||
| 38 × 286 | 4.39 | 4.18 | 3.97 | 4.63 | 4.35 | 4.09 | 4.78 | 4.45 | 4.15 | ||
| No. 1 and No. 2 | 38 × 89 | 1.59 | 1.48 | 1.37 | 1.80 | 1.64 | 1.43 | 1.80 | 1.64 | 1.43 | |
| 38 × 140 | 2.51 | 2.33 | 2.16 | 2.83 | 2.57 | 2.25 | 2.83 | 2.57 | 2.25 | ||
| 38 × 184 | 3.19 | 3.04 | 2.84 | 3.44 | 3.23 | 2.96 | 3.60 | 3.36 | 2.96 | ||
| 38 × 235 | 3.76 | 3.58 | 3.41 | 4.01 | 3.77 | 3.54 | 4.16 | 3.88 | 3.62 | ||
| 38 × 286 | 4.29 | 4.08 | 3.88 | 4.53 | 4.25 | 4.00 | 4.67 | 4.35 | 4.06 | ||
| No. 3 | 38 × 89 | 1.54 | 1.43 | 1.32 | 1.74 | 1.57 | 1.36 | 1.76 | 1.60 | 1.36 | |
| 38 × 140 | 2.42 | 2.24 | 1.94 | 2.74 | 2.38 | 1.94 | 2.75 | 2.38 | 1.94 | ||
| 38 × 184 | 3.12 | 2.90 | 2.37 | 3.35 | 2.90 | 2.37 | 3.35 | 2.90 | 2.37 | ||
| 38 × 235 | 3.67 | 3.49 | 2.89 | 3.91 | 3.54 | 2.89 | 4.06 | 3.54 | 2.89 | ||
| 38 × 286 | 4.19 | 3.98 | 3.36 | 4.42 | 4.11 | 3.36 | 4.55 | 4.11 | 3.36 | ||
| Construction | 38 × 89 | 1.54 | 1.43 | 1.32 | 1.74 | 1.57 | 1.40 | 1.76 | 1.60 | 1.40 | |
| Standard | 38 × 89 | 1.48 | 1.37 | 1.15 | 1.63 | 1.41 | 1.15 | 1.63 | 1.41 | 1.15 | |
Notes to Table 9.23.4.2.-A:
(1)
Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floor does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
See Sentence 9.23.9.4.(5) for alternatives to strapping.
| Commercial Designation | Grade | Joist Size, mm | Maximum Span, m | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Joists with Ceilings Attached to Wood Furring | Joists with Concrete Topping | ||||||||||
| Without Bridging | With Bridging | With or Without Bridging(2) | |||||||||
| Joist Spacing, mm | Joist Spacing, mm | Joist Spacing, mm | |||||||||
| 300 | 400 | 600 | 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 2.19 | 1.99 | 1.73 | 2.19 | 1.99 | 1.73 | 2.19 | 1.99 | 1.73 |
| 38 × 140 | 3.44 | 3.12 | 2.73 | 3.44 | 3.12 | 2.73 | 3.44 | 3.12 | 2.73 | ||
| 38 × 184 | 4.24 | 3.99 | 3.59 | 4.52 | 4.11 | 3.59 | 4.52 | 4.11 | 3.59 | ||
| 38 × 235 | 4.98 | 4.69 | 4.29 | 5.47 | 5.20 | 4.58 | 5.77 | 5.24 | 4.58 | ||
| 38 × 286 | 5.67 | 5.34 | 4.88 | 6.19 | 5.89 | 5.54 | 6.83 | 6.37 | 5.58 | ||
| No. 1 and No. 2 | 38 × 89 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | |
| 38 × 140 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.55 | ||
| 38 × 184 | 4.06 | 3.83 | 3.44 | 4.33 | 3.93 | 3.44 | 4.33 | 3.81 | 3.11 | ||
| 38 × 235 | 4.78 | 4.50 | 4.11 | 5.24 | 4.98 | 4.31 | 5.37 | 4.65 | 3.80 | ||
| 38 × 286 | 5.44 | 5.12 | 4.68 | 5.93 | 5.64 | 5.00 | 6.24 | 5.40 | 4.41 | ||
| No. 3 | 38 × 89 | 1.95 | 1.69 | 1.38 | 1.95 | 1.69 | 1.38 | 1.72 | 1.49 | 1.21 | |
| 38 × 140 | 2.78 | 2.41 | 1.97 | 2.78 | 2.41 | 1.97 | 2.45 | 2.12 | 1.73 | ||
| 38 × 184 | 3.38 | 2.93 | 2.39 | 3.38 | 2.93 | 2.39 | 2.98 | 2.58 | 2.11 | ||
| 38 × 235 | 4.14 | 3.58 | 2.93 | 4.14 | 3.58 | 2.93 | 3.65 | 3.16 | 2.58 | ||
| 38 × 286 | 4.80 | 4.16 | 3.39 | 4.80 | 4.16 | 3.39 | 4.23 | 3.66 | 2.99 | ||
| Construction | 38 × 89 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | |
| Standard | 38 × 89 | 1.88 | 1.63 | 1.33 | 1.88 | 1.63 | 1.33 | 1.66 | 1.44 | 1.17 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 2.16 | 1.96 | 1.71 | 2.16 | 1.96 | 1.71 | 2.16 | 1.96 | 1.71 |
| 38 × 140 | 3.39 | 3.08 | 2.69 | 3.39 | 3.08 | 2.69 | 3.39 | 3.08 | 2.69 | ||
| 38 × 184 | 4.18 | 3.94 | 3.54 | 4.46 | 4.05 | 3.54 | 4.46 | 4.05 | 3.54 | ||
| 38 × 235 | 4.92 | 4.63 | 4.23 | 5.39 | 5.13 | 4.52 | 5.69 | 5.17 | 4.52 | ||
| 38 × 286 | 5.60 | 5.27 | 4.82 | 6.10 | 5.81 | 5.47 | 6.74 | 6.28 | 5.50 | ||
| No. 1 and No. 2 | 38 × 89 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | 2.09 | 1.90 | 1.66 | |
| 38 × 140 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.62 | 3.29 | 2.99 | 2.62 | ||
| 38 × 184 | 4.06 | 3.83 | 3.44 | 4.33 | 3.93 | 3.44 | 4.33 | 3.93 | 3.26 | ||
| 38 × 235 | 4.78 | 4.50 | 4.11 | 5.24 | 4.98 | 4.39 | 5.53 | 4.88 | 3.99 | ||
| 38 × 286 | 5.44 | 5.12 | 4.68 | 5.93 | 5.64 | 5.25 | 6.54 | 5.66 | 4.63 | ||
| No. 3 | 38 × 89 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.83 | 1.50 | |
| 38 × 140 | 3.19 | 2.90 | 2.43 | 3.19 | 2.90 | 2.43 | 3.02 | 2.62 | 2.14 | ||
| 38 × 184 | 3.94 | 3.61 | 2.95 | 4.17 | 3.61 | 2.95 | 3.68 | 3.18 | 2.60 | ||
| 38 × 235 | 4.63 | 4.36 | 3.61 | 5.08 | 4.42 | 3.61 | 4.50 | 3.89 | 3.18 | ||
| 38 × 286 | 5.27 | 4.96 | 4.19 | 5.74 | 5.13 | 4.19 | 5.22 | 4.52 | 3.69 | ||
| Construction | 38 × 89 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | 2.03 | 1.84 | 1.61 | |
| Standard | 38 × 89 | 1.96 | 1.71 | 1.39 | 1.96 | 1.71 | 1.39 | 1.74 | 1.50 | 1.23 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 2.06 | 1.87 | 1.64 | 2.06 | 1.87 | 1.64 | 2.06 | 1.87 | 1.64 |
| 38 × 140 | 3.24 | 2.95 | 2.57 | 3.24 | 2.95 | 2.57 | 3.24 | 2.95 | 2.57 | ||
| 38 × 184 | 4.00 | 3.77 | 3.38 | 4.26 | 3.87 | 3.38 | 4.26 | 3.87 | 3.38 | ||
| 38 × 235 | 4.70 | 4.43 | 4.05 | 5.16 | 4.91 | 4.32 | 5.45 | 4.95 | 4.32 | ||
| 38 × 286 | 5.35 | 5.04 | 4.61 | 5.84 | 5.55 | 5.23 | 6.45 | 6.01 | 5.26 | ||
| No. 1 and No. 2 | 38 × 89 | 1.99 | 1.81 | 1.58 | 1.99 | 1.81 | 1.58 | 1.99 | 1.81 | 1.58 | |
| 38 × 140 | 3.14 | 2.85 | 2.49 | 3.14 | 2.85 | 2.49 | 3.14 | 2.85 | 2.49 | ||
| 38 × 184 | 3.87 | 3.64 | 3.27 | 4.12 | 3.75 | 3.27 | 4.12 | 3.75 | 3.27 | ||
| 38 × 235 | 4.55 | 4.28 | 3.91 | 4.99 | 4.75 | 4.18 | 5.27 | 4.79 | 4.13 | ||
| 38 × 286 | 5.18 | 4.88 | 4.46 | 5.65 | 5.37 | 5.06 | 6.23 | 5.81 | 4.79 | ||
| No. 3 | 38 × 89 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.50 | |
| 38 × 140 | 3.08 | 2.80 | 2.43 | 3.08 | 2.80 | 2.43 | 3.02 | 2.62 | 2.14 | ||
| 38 × 184 | 3.80 | 3.58 | 2.95 | 4.05 | 3.61 | 2.95 | 3.68 | 3.18 | 2.60 | ||
| 38 × 235 | 4.47 | 4.21 | 3.61 | 4.90 | 4.42 | 3.61 | 4.50 | 3.89 | 3.18 | ||
| 38 × 286 | 5.09 | 4.79 | 4.19 | 5.55 | 5.13 | 4.19 | 5.22 | 4.52 | 3.69 | ||
| Construction | 38 × 89 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.55 | 1.96 | 1.78 | 1.55 | |
| Standard | 38 × 89 | 1.88 | 1.71 | 1.44 | 1.88 | 1.71 | 1.44 | 1.80 | 1.56 | 1.27 | |
| Northern Species (includes any Canadian Species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 1.84 | 1.68 | 1.46 | 1.84 | 1.68 | 1.46 | 1.84 | 1.68 | 1.46 |
| 38 × 140 | 2.90 | 2.63 | 2.30 | 2.90 | 2.63 | 2.30 | 2.90 | 2.63 | 2.30 | ||
| 38 × 184 | 3.58 | 3.37 | 3.03 | 3.81 | 3.46 | 3.03 | 3.81 | 3.46 | 3.03 | ||
| 38 × 235 | 4.20 | 3.96 | 3.62 | 4.61 | 4.39 | 3.86 | 4.87 | 4.42 | 3.86 | ||
| 38 × 286 | 4.79 | 4.51 | 4.12 | 5.22 | 4.96 | 4.68 | 5.76 | 5.37 | 4.54 | ||
| No. 1 and No. 2 | 38 × 89 | 1.80 | 1.64 | 1.43 | 1.80 | 1.64 | 1.43 | 1.80 | 1.64 | 1.43 | |
| 38 × 140 | 2.83 | 2.57 | 2.25 | 2.83 | 2.57 | 2.25 | 2.83 | 2.57 | 2.23 | ||
| 38 × 184 | 3.50 | 3.29 | 2.96 | 3.72 | 3.38 | 2.96 | 3.72 | 3.32 | 2.71 | ||
| 38 × 235 | 4.11 | 3.87 | 3.54 | 4.51 | 4.29 | 3.76 | 4.69 | 4.06 | 3.31 | ||
| 38 × 286 | 4.68 | 4.40 | 4.03 | 5.10 | 4.85 | 4.36 | 5.44 | 4.71 | 3.84 | ||
| No. 3 | 38 × 89 | 1.76 | 1.60 | 1.36 | 1.76 | 1.60 | 1.36 | 1.70 | 1.47 | 1.20 | |
| 38 × 140 | 2.75 | 2.38 | 1.94 | 2.75 | 2.38 | 1.94 | 2.42 | 2.10 | 1.71 | ||
| 38 × 184 | 3.35 | 2.90 | 2.37 | 3.35 | 2.90 | 2.37 | 2.95 | 2.55 | 2.08 | ||
| 38 × 235 | 4.01 | 3.54 | 2.89 | 4.09 | 3.54 | 2.89 | 3.61 | 3.12 | 2.55 | ||
| 38 × 286 | 4.56 | 4.11 | 3.36 | 4.75 | 4.11 | 3.36 | 4.18 | 3.62 | 2.96 | ||
| Construction | 38 × 89 | 1.76 | 1.60 | 1.40 | 1.76 | 1.60 | 1.40 | 1.76 | 1.60 | 1.37 | |
| Standard | 38 × 89 | 1.63 | 1.41 | 1.15 | 1.63 | 1.41 | 1.15 | 1.44 | 1.25 | 1.02 | |
Notes to Table 9.23.4.2.-B:
(1)
Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floor does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
No bridging is assumed for spans for floor joists with concrete topping.
| Commercial Designation | Grade | Joist Size, mm | Maximum Span, m | ||
|---|---|---|---|---|---|
| Joist Spacing, mm | |||||
| 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 3.41 | 3.10 | 2.71 |
| 38 × 140 | 5.37 | 4.88 | 4.26 | ||
| 38 × 184 | 7.05 | 6.41 | 5.60 | ||
| 38 × 235 | 9.01 | 8.18 | 7.15 | ||
| 38 × 286 | 10.96 | 9.96 | 8.70 | ||
| No. 1 and No. 2 | 38 × 89 | 3.27 | 2.97 | 2.59 | |
| 38 × 140 | 5.14 | 4.67 | 4.08 | ||
| 38 × 184 | 6.76 | 6.14 | 5.36 | ||
| 38 × 235 | 8.63 | 7.84 | 6.85 | ||
| 38 × 286 | 10.50 | 9.54 | 8.34 | ||
| No. 3 | 38 × 89 | 3.17 | 2.88 | 2.42 | |
| 38 × 140 | 4.89 | 4.23 | 3.46 | ||
| 38 × 184 | 5.95 | 5.15 | 4.20 | ||
| 38 × 235 | 7.27 | 6.30 | 5.14 | ||
| 38 × 286 | 8.44 | 7.31 | 5.97 | ||
| Construction | 38 × 89 | 3.17 | 2.88 | 2.51 | |
| Standard | 38 × 89 | 3.06 | 2.78 | 2.34 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 3.36 | 3.06 | 2.67 |
| 38 × 140 | 5.29 | 4.81 | 4.20 | ||
| 38 × 184 | 6.96 | 6.32 | 5.52 | ||
| 38 × 235 | 8.88 | 8.07 | 7.05 | ||
| 38 × 286 | 10.81 | 9.82 | 8.58 | ||
| No. 1 and No. 2 | 38 × 89 | 3.27 | 2.97 | 2.59 | |
| 38 × 140 | 5.14 | 4.67 | 4.08 | ||
| 38 × 184 | 6.76 | 6.14 | 5.36 | ||
| 38 × 235 | 8.63 | 7.84 | 6.85 | ||
| 38 × 286 | 10.50 | 9.54 | 8.34 | ||
| No. 3 | 38 × 89 | 3.17 | 2.88 | 2.51 | |
| 38 × 140 | 4.98 | 4.53 | 3.95 | ||
| 38 × 184 | 6.55 | 5.95 | 5.19 | ||
| 38 × 235 | 8.36 | 7.60 | 6.34 | ||
| 38 × 286 | 10.18 | 9.01 | 7.36 | ||
| Construction | 38 × 89 | 3.17 | 2.88 | 2.50 | |
| Standard | 38 × 89 | 3.06 | 2.78 | 2.43 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 3.22 | 2.92 | 2.55 |
| 38 × 140 | 5.06 | 4.60 | 4.02 | ||
| 38 × 184 | 6.65 | 6.05 | 5.28 | ||
| 38 × 235 | 8.50 | 7.72 | 6.74 | ||
| 38 × 286 | 10.34 | 9.40 | 8.21 | ||
| No. 1 and No. 2 | 38 × 89 | 3.11 | 2.83 | 2.47 | |
| 38 × 140 | 4.90 | 4.45 | 3.89 | ||
| 38 × 184 | 6.44 | 5.85 | 5.11 | ||
| 38 × 235 | 8.22 | 7.47 | 6.52 | ||
| 38 × 286 | 10.00 | 9.09 | 7.94 | ||
| No. 3 | 38 × 89 | 3.06 | 2.78 | 2.43 | |
| 38 × 140 | 4.81 | 4.37 | 3.82 | ||
| 38 × 184 | 6.32 | 5.74 | 5.02 | ||
| 38 × 235 | 8.07 | 7.33 | 6.34 | ||
| 38 × 286 | 9.82 | 8.93 | 7.36 | ||
| Construction | 38 × 89 | 3.06 | 2.78 | 2.43 | |
| Standard | 38 × 89 | 2.94 | 2.67 | 2.33 | |
| Northern Species (includes any Canadian Species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 2.88 | 2.61 | 2.28 |
| 38 × 140 | 4.53 | 4.11 | 3.59 | ||
| 38 × 184 | 5.95 | 5.40 | 4.72 | ||
| 38 × 235 | 7.60 | 6.90 | 6.03 | ||
| 38 × 286 | 9.25 | 8.40 | 7.34 | ||
| No. 1 and No. 2 | 38 × 89 | 2.81 | 2.55 | 2.23 | |
| 38 × 140 | 4.42 | 4.02 | 3.51 | ||
| 38 × 184 | 5.81 | 5.28 | 4.61 | ||
| 38 × 235 | 7.42 | 6.74 | 5.89 | ||
| 38 × 286 | 9.03 | 8.21 | 7.17 | ||
| No. 3 | 38 × 89 | 2.74 | 2.49 | 2.18 | |
| 38 × 140 | 4.31 | 3.92 | 3.42 | ||
| 38 × 184 | 5.67 | 5.09 | 4.16 | ||
| 38 × 235 | 7.19 | 6.23 | 5.08 | ||
| 38 × 286 | 8.34 | 7.23 | 5.90 | ||
| Construction | 38 × 89 | 2.74 | 2.49 | 2.18 | |
| Standard | 38 × 89 | 2.67 | 2.43 | 2.03 | |
| Commercial Designation | Grade | Joist Size, mm | Maximum Span, m | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Specified Snow Load, kPa | |||||||||||
| 1.0 | 1.5 | 2.0 | |||||||||
| Joist Spacing, mm | Joist Spacing, mm | Joist Spacing, mm | |||||||||
| 300 | 400 | 600 | 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 2.71 | 2.46 | 2.15 | 2.37 | 2.15 | 1.88 | 2.15 | 1.95 | 1.71 |
| 38 × 140 | 4.26 | 3.87 | 3.38 | 3.72 | 3.38 | 2.95 | 3.38 | 3.07 | 2.68 | ||
| 38 × 184 | 5.60 | 5.09 | 4.44 | 4.89 | 4.44 | 3.88 | 4.44 | 4.04 | 3.53 | ||
| 38 × 235 | 7.15 | 6.49 | 5.67 | 6.24 | 5.67 | 4.96 | 5.67 | 5.15 | 4.50 | ||
| 38 × 286 | 8.70 | 7.90 | 6.91 | 7.60 | 6.91 | 6.03 | 6.91 | 6.27 | 5.48 | ||
| No. 1 and No. 2 | 38 × 89 | 2.59 | 2.36 | 2.06 | 2.27 | 2.06 | 1.80 | 2.06 | 1.87 | 1.63 | |
| 38 × 140 | 4.08 | 3.71 | 3.24 | 3.57 | 3.24 | 2.83 | 3.24 | 2.94 | 2.57 | ||
| 38 × 184 | 5.36 | 4.87 | 4.26 | 4.69 | 4.26 | 3.72 | 4.26 | 3.87 | 3.38 | ||
| 38 × 235 | 6.85 | 6.22 | 5.44 | 5.98 | 5.44 | 4.74 | 5.44 | 4.94 | 4.22 | ||
| 38 × 286 | 8.34 | 7.57 | 6.40 | 7.28 | 6.62 | 5.50 | 6.62 | 6.00 | 4.90 | ||
| No. 3 | 38 × 89 | 2.49 | 2.16 | 1.76 | 2.14 | 1.85 | 1.51 | 1.91 | 1.65 | 1.35 | |
| 38 × 140 | 3.56 | 3.08 | 2.51 | 3.06 | 2.65 | 2.16 | 2.72 | 2.36 | 1.92 | ||
| 38 × 184 | 4.33 | 3.75 | 3.06 | 3.72 | 3.22 | 2.63 | 3.31 | 2.87 | 2.34 | ||
| 38 × 235 | 5.29 | 4.58 | 3.74 | 4.55 | 3.94 | 3.22 | 4.05 | 3.51 | 2.86 | ||
| 38 × 286 | 6.14 | 5.32 | 4.34 | 5.28 | 4.57 | 3.73 | 4.70 | 4.07 | 3.32 | ||
| Construction | 38 × 89 | 2.51 | 2.28 | 1.99 | 2.20 | 1.99 | 1.74 | 1.99 | 1.81 | 1.58 | |
| Standard | 38 × 89 | 2.41 | 2.08 | 1.70 | 2.07 | 1.79 | 1.46 | 1.84 | 1.60 | 1.30 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 2.67 | 2.43 | 2.12 | 2.33 | 2.12 | 1.85 | 2.12 | 1.93 | 1.68 |
| 38 × 140 | 4.20 | 3.82 | 3.33 | 3.67 | 3.33 | 2.91 | 3.33 | 3.03 | 2.65 | ||
| 38 × 184 | 5.52 | 5.02 | 4.38 | 4.82 | 4.38 | 3.83 | 4.38 | 3.98 | 3.48 | ||
| 38 × 235 | 7.05 | 6.41 | 5.60 | 6.16 | 5.60 | 4.89 | 5.60 | 5.09 | 4.44 | ||
| 38 × 286 | 8.58 | 7.80 | 6.81 | 7.50 | 6.81 | 5.95 | 6.81 | 6.19 | 5.41 | ||
| No. 1 and No. 2 | 38 × 89 | 2.59 | 2.36 | 2.06 | 2.27 | 2.06 | 1.80 | 2.06 | 1.87 | 1.63 | |
| 38 × 140 | 4.08 | 3.71 | 3.24 | 3.57 | 3.24 | 2.83 | 3.24 | 2.94 | 2.57 | ||
| 38 × 184 | 5.36 | 4.87 | 4.26 | 4.69 | 4.26 | 3.72 | 4.26 | 3.87 | 3.38 | ||
| 38 × 235 | 6.85 | 6.22 | 5.44 | 5.98 | 5.44 | 4.75 | 5.44 | 4.94 | 4.32 | ||
| 38 × 286 | 8.34 | 7.57 | 6.62 | 7.28 | 6.62 | 5.77 | 6.62 | 6.01 | 5.25 | ||
| No. 3 | 38 × 89 | 2.51 | 2.28 | 1.99 | 2.20 | 1.99 | 1.74 | 1.99 | 1.81 | 1.58 | |
| 38 × 140 | 3.95 | 3.59 | 3.10 | 3.45 | 3.14 | 2.67 | 3.14 | 2.85 | 2.37 | ||
| 38 × 184 | 5.20 | 4.62 | 3.77 | 4.54 | 3.97 | 3.24 | 4.09 | 3.54 | 2.89 | ||
| 38 × 235 | 6.53 | 5.65 | 4.61 | 5.61 | 4.86 | 3.97 | 5.00 | 4.33 | 3.53 | ||
| 38 × 286 | 7.57 | 6.56 | 5.35 | 6.51 | 5.64 | 4.60 | 5.80 | 5.02 | 4.10 | ||
| Construction | 38 × 89 | 2.51 | 2.28 | 1.99 | 2.20 | 1.99 | 1.74 | 1.99 | 1.81 | 1.58 | |
| Standard | 38 × 89 | 2.43 | 2.18 | 1.78 | 2.12 | 1.88 | 1.53 | 1.93 | 1.67 | 1.36 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 2.55 | 2.32 | 2.03 | 2.23 | 2.03 | 1.77 | 2.03 | 1.84 | 1.61 |
| 38 × 140 | 4.02 | 3.65 | 3.19 | 3.51 | 3.19 | 2.79 | 3.19 | 2.90 | 2.53 | ||
| 38 × 184 | 5.28 | 4.80 | 4.19 | 4.61 | 4.19 | 3.66 | 4.19 | 3.81 | 3.33 | ||
| 38 × 235 | 6.74 | 6.13 | 5.35 | 5.89 | 5.35 | 4.68 | 5.35 | 4.86 | 4.25 | ||
| 38 × 286 | 8.21 | 7.46 | 6.52 | 7.17 | 6.52 | 5.69 | 6.52 | 5.92 | 5.17 | ||
| No. 1 and No. 2 | 38 × 89 | 2.47 | 2.24 | 1.96 | 2.16 | 1.96 | 1.71 | 1.96 | 1.78 | 1.56 | |
| 38 × 140 | 3.89 | 3.53 | 3.08 | 3.40 | 3.08 | 2.69 | 3.08 | 2.80 | 2.45 | ||
| 38 × 184 | 5.11 | 4.64 | 4.05 | 4.46 | 4.05 | 3.54 | 4.05 | 3.68 | 3.22 | ||
| 38 × 235 | 6.52 | 5.93 | 5.18 | 5.70 | 5.18 | 4.52 | 5.18 | 4.70 | 4.11 | ||
| 38 × 286 | 7.94 | 7.21 | 6.30 | 6.94 | 6.30 | 5.50 | 6.30 | 5.73 | 5.00 | ||
| No. 3 | 38 × 89 | 2.43 | 2.20 | 1.93 | 2.12 | 1.93 | 1.68 | 1.93 | 1.75 | 1.53 | |
| 38 × 140 | 3.82 | 3.47 | 3.03 | 3.33 | 3.03 | 2.65 | 3.03 | 2.75 | 2.37 | ||
| 38 × 184 | 5.02 | 4.56 | 3.77 | 4.38 | 3.97 | 3.24 | 3.98 | 3.54 | 2.89 | ||
| 38 × 235 | 6.41 | 5.65 | 4.61 | 5.60 | 4.86 | 3.97 | 5.00 | 4.33 | 3.53 | ||
| 38 × 286 | 7.57 | 6.56 | 5.35 | 6.51 | 5.64 | 4.60 | 5.80 | 5.02 | 4.10 | ||
| Construction | 38 × 89 | 2.43 | 2.20 | 1.93 | 2.12 | 1.93 | 1.68 | 1.93 | 1.75 | 1.53 | |
| Standard | 38 × 89 | 2.33 | 2.12 | 1.85 | 2.04 | 1.85 | 1.59 | 1.85 | 1.68 | 1.41 | |
| Northern Species (includes any Canadian Species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 2.28 | 2.07 | 1.81 | 1.99 | 1.81 | 1.58 | 1.81 | 1.65 | 1.44 |
| 38 × 140 | 3.59 | 3.26 | 2.85 | 3.14 | 2.85 | 2.49 | 2.85 | 2.59 | 2.26 | ||
| 38 × 184 | 4.72 | 4.29 | 3.75 | 4.12 | 3.75 | 3.27 | 3.75 | 3.40 | 2.97 | ||
| 38 × 235 | 6.03 | 5.48 | 4.79 | 5.27 | 4.79 | 4.18 | 4.79 | 4.35 | 3.80 | ||
| 38 × 286 | 7.34 | 6.67 | 5.82 | 6.41 | 5.82 | 5.09 | 5.82 | 5.29 | 4.62 | ||
| No. 1 and No. 2 | 38 × 89 | 2.23 | 2.03 | 1.77 | 1.95 | 1.77 | 1.55 | 1.77 | 1.61 | 1.41 | |
| 38 × 140 | 3.51 | 3.19 | 2.79 | 3.07 | 2.79 | 2.43 | 2.79 | 2.53 | 2.21 | ||
| 38 × 184 | 4.61 | 4.19 | 3.66 | 4.03 | 3.66 | 3.20 | 3.66 | 3.33 | 2.91 | ||
| 38 × 235 | 5.89 | 5.35 | 4.68 | 5.15 | 4.68 | 4.09 | 4.68 | 4.25 | 3.68 | ||
| 38 × 286 | 7.17 | 6.52 | 5.58 | 6.26 | 5.69 | 4.80 | 5.69 | 5.17 | 4.27 | ||
| No. 3 | 38 × 89 | 2.18 | 1.98 | 1.73 | 1.90 | 1.73 | 1.50 | 1.73 | 1.57 | 1.33 | |
| 38 × 140 | 3.42 | 3.05 | 2.49 | 2.99 | 2.62 | 2.14 | 2.69 | 2.33 | 1.90 | ||
| 38 × 184 | 4.28 | 3.71 | 3.03 | 3.68 | 3.19 | 2.60 | 3.28 | 2.84 | 2.32 | ||
| 38 × 235 | 5.23 | 4.53 | 3.70 | 4.50 | 3.90 | 3.18 | 4.01 | 3.47 | 2.83 | ||
| 38 × 286 | 6.07 | 5.26 | 4.29 | 5.22 | 4.52 | 3.69 | 4.65 | 4.03 | 3.29 | ||
| Construction | 38 × 89 | 2.18 | 1.98 | 1.73 | 1.90 | 1.73 | 1.51 | 1.73 | 1.57 | 1.37 | |
| Standard | 38 × 89 | 2.09 | 1.81 | 1.48 | 1.80 | 1.56 | 1.27 | 1.60 | 1.38 | 1.13 | |
| Commercial Designation | Grade | Joist Size, mm | Maximum Span, m | |||||
|---|---|---|---|---|---|---|---|---|
| Specified Snow Load, kPa | ||||||||
| 2.5 | 3.0 | |||||||
| Joist Spacing, mm | Joist Spacing, mm | |||||||
| 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 1.99 | 1.81 | 1.58 | 1.88 | 1.71 | 1.49 |
| 38 × 140 | 3.14 | 2.85 | 2.49 | 2.95 | 2.68 | 2.34 | ||
| 38 × 184 | 4.12 | 3.75 | 3.27 | 3.88 | 3.53 | 3.08 | ||
| 38 × 235 | 5.27 | 4.79 | 4.18 | 4.96 | 4.50 | 3.93 | ||
| 38 × 286 | 6.41 | 5.82 | 5.09 | 6.03 | 5.48 | 4.79 | ||
| No. 1 and No. 2 | 38 × 89 | 1.91 | 1.74 | 1.52 | 1.80 | 1.63 | 1.43 | |
| 38 × 140 | 3.01 | 2.73 | 2.39 | 2.83 | 2.57 | 2.25 | ||
| 38 × 184 | 3.95 | 3.59 | 3.14 | 3.72 | 3.38 | 2.90 | ||
| 38 × 235 | 5.05 | 4.59 | 3.84 | 4.75 | 4.32 | 3.55 | ||
| 38 × 286 | 6.14 | 5.46 | 4.46 | 5.78 | 5.05 | 4.12 | ||
| No. 3 | 38 × 89 | 1.74 | 1.50 | 1.23 | 1.60 | 1.39 | 1.13 | |
| 38 × 140 | 2.48 | 2.15 | 1.75 | 2.29 | 1.98 | 1.62 | ||
| 38 × 184 | 3.01 | 2.61 | 2.13 | 2.79 | 2.41 | 1.97 | ||
| 38 × 235 | 3.69 | 3.19 | 2.61 | 3.41 | 2.95 | 2.41 | ||
| 38 × 286 | 4.28 | 3.70 | 3.03 | 3.95 | 3.42 | 2.79 | ||
| Construction | 38 × 89 | 1.85 | 1.68 | 1.47 | 1.74 | 1.58 | 1.38 | |
| Standard | 38 × 89 | 1.68 | 1.45 | 1.19 | 1.55 | 1.34 | 1.10 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 1.97 | 1.79 | 1.56 | 1.85 | 1.68 | 1.47 |
| 38 × 140 | 3.10 | 2.81 | 2.46 | 2.91 | 2.65 | 2.31 | ||
| 38 × 184 | 4.07 | 3.70 | 3.23 | 3.83 | 3.48 | 3.04 | ||
| 38 × 235 | 5.20 | 4.72 | 4.12 | 4.89 | 4.44 | 3.88 | ||
| 38 × 286 | 6.32 | 5.75 | 5.02 | 5.95 | 5.41 | 4.72 | ||
| No. 1 and No. 2 | 38 × 89 | 1.91 | 1.74 | 1.52 | 1.80 | 1.63 | 1.43 | |
| 38 × 140 | 3.01 | 2.73 | 2.39 | 2.83 | 2.57 | 2.25 | ||
| 38 × 184 | 3.95 | 3.59 | 3.14 | 3.72 | 3.38 | 2.95 | ||
| 38 × 235 | 5.05 | 4.59 | 4.01 | 4.75 | 4.32 | 3.72 | ||
| 38 × 286 | 6.14 | 5.58 | 4.68 | 5.78 | 5.25 | 4.32 | ||
| No. 3 | 38 × 89 | 1.85 | 1.68 | 1.47 | 1.74 | 1.58 | 1.38 | |
| 38 × 140 | 2.91 | 2.65 | 2.16 | 2.74 | 2.45 | 2.00 | ||
| 38 × 184 | 3.72 | 3.22 | 2.63 | 3.44 | 2.98 | 2.43 | ||
| 38 × 235 | 4.55 | 3.94 | 3.22 | 4.20 | 3.64 | 2.97 | ||
| 38 × 286 | 5.28 | 4.57 | 3.73 | 4.88 | 4.22 | 3.45 | ||
| Construction | 38 × 89 | 1.85 | 1.68 | 1.47 | 1.74 | 1.58 | 1.38 | |
| Standard | 38 × 89 | 1.76 | 1.52 | 1.24 | 1.62 | 1.40 | 1.15 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 1.88 | 1.71 | 1.49 | 1.77 | 1.61 | 1.41 |
| 38 × 140 | 2.96 | 2.69 | 2.35 | 2.79 | 2.53 | 2.21 | ||
| 38 × 184 | 3.89 | 3.54 | 3.09 | 3.66 | 3.33 | 2.91 | ||
| 38 × 235 | 4.97 | 4.52 | 3.94 | 4.68 | 4.25 | 3.71 | ||
| 38 × 286 | 6.05 | 5.50 | 4.80 | 5.69 | 5.17 | 4.52 | ||
| No. 1 and No. 2 | 38 × 89 | 1.82 | 1.65 | 1.44 | 1.71 | 1.56 | 1.36 | |
| 38 × 140 | 2.86 | 2.60 | 2.27 | 2.69 | 2.45 | 2.14 | ||
| 38 × 184 | 3.76 | 3.42 | 2.99 | 3.54 | 3.22 | 2.81 | ||
| 38 × 235 | 4.81 | 4.37 | 3.82 | 4.52 | 4.11 | 3.59 | ||
| 38 × 286 | 5.85 | 5.31 | 4.64 | 5.50 | 5.00 | 4.37 | ||
| No. 3 | 38 × 89 | 1.79 | 1.62 | 1.42 | 1.68 | 1.53 | 1.34 | |
| 38 × 140 | 2.81 | 2.56 | 2.16 | 2.65 | 2.40 | 2.005 | ||
| 38 × 184 | 3.70 | 3.22 | 2.63 | 3.44 | 2.98 | 2.43 | ||
| 38 × 235 | 4.55 | 3.94 | 3.22 | 4.20 | 3.64 | 2.97 | ||
| 38 × 286 | 5.28 | 4.57 | 3.73 | 4.88 | 4.22 | 3.45 | ||
| Construction | 38 × 89 | 1.79 | 1.62 | 1.42 | 1.68 | 1.53 | 1.34 | |
| Standard | 38 × 89 | 1.72 | 1.56 | 1.29 | 1.62 | 1.46 | 1.19 | |
| Northern Species (includes any Canadian Species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 1.68 | 1.53 | 1.34 | 1.58 | 1.44 | 1.26 |
| 38 × 140 | 2.65 | 2.40 | 2.10 | 2.49 | 2.26 | 1.98 | ||
| 38 × 184 | 3.48 | 3.16 | 2.76 | 3.27 | 2.97 | 2.60 | ||
| 38 × 235 | 4.44 | 4.04 | 3.53 | 4.18 | 3.80 | 3.32 | ||
| 38 × 286 | 5.41 | 4.91 | 4.29 | 5.09 | 4.62 | 4.04 | ||
| No. 1 and No. 2 | 38 × 89 | 1.64 | 1.49 | 1.31 | 1.55 | 1.41 | 1.23 | |
| 38 × 140 | 2.59 | 2.35 | 2.05 | 2.43 | 2.21 | 1.93 | ||
| 38 × 184 | 3.40 | 3.09 | 2.70 | 3.20 | 2.91 | 2.53 | ||
| 38 × 235 | 4.34 | 3.94 | 3.35 | 4.09 | 3.71 | 3.10 | ||
| 38 × 286 | 5.28 | 4.76 | 3.89 | 4.97 | 4.40 | 3.59 | ||
| No. 3 | 38 × 89 | 1.60 | 1.46 | 1.21 | 1.51 | 1.37 | 1.12 | |
| 38 × 140 | 2.45 | 2.12 | 1.73 | 2.26 | 1.96 | 1.60 | ||
| 38 × 184 | 2.98 | 2.58 | 2.11 | 2.76 | 2.39 | 1.95 | ||
| 38 × 235 | 3.65 | 3.16 | 2.58 | 3.37 | 2.92 | 2.38 | ||
| 38 × 286 | 4.23 | 3.66 | 2.99 | 3.91 | 3.39 | 2.76 | ||
| Construction | 38 × 89 | 1.60 | 1.46 | 1.27 | 1.51 | 1.37 | 1.20 | |
| Standard | 38 × 89 | 1.46 | 1.26 | 1.03 | 1.34 | 1.16 | 0.95 | |
| Commercial Designation | Grade | Rafter Size, mm | Maximum Span, m | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Specified Snow Load, kPa | |||||||||||
| 1.0 | 1.5 | 2.0 | |||||||||
| Rafter Spacing, mm | Rafter Spacing, mm | Rafter Spacing, mm | |||||||||
| 300 | 400 | 600 | 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 3.41 | 3.10 | 2.71 | 2.98 | 2.71 | 2.37 | 2.71 | 2.46 | 2.15 |
| 38 × 140 | 5.37 | 4.88 | 4.26 | 4.69 | 4.26 | 3.72 | 4.26 | 3.87 | 3.38 | ||
| 38 × 184 | 7.05 | 6.41 | 5.60 | 6.16 | 5.60 | 4.89 | 5.60 | 5.09 | 4.44 | ||
| 38 × 235 | 9.01 | 8.18 | 7.15 | 7.87 | 7.15 | 6.24 | 7.15 | 6.49 | 5.62 | ||
| 38 × 286 | 10.96 | 9.96 | 8.70 | 9.58 | 8.70 | 7.40 | 8.70 | 7.90 | 6.52 | ||
| No. 1 and No. 2 | 38 × 89 | 3.27 | 2.97 | 2.59 | 2.86 | 2.59 | 2.27 | 2.59 | 2.36 | 2.06 | |
| 38 × 140 | 5.14 | 4.67 | 3.95 | 4.49 | 4.08 | 3.34 | 4.08 | 3.60 | 2.94 | ||
| 38 × 184 | 6.76 | 5.88 | 4.80 | 5.74 | 4.97 | 4.06 | 5.06 | 4.38 | 3.58 | ||
| 38 × 235 | 8.30 | 7.19 | 5.87 | 7.02 | 6.08 | 4.96 | 6.19 | 5.36 | 4.38 | ||
| 38 × 286 | 9.63 | 8.34 | 6.81 | 8.14 | 7.05 | 5.76 | 7.18 | 6.22 | 5.08 | ||
| No. 3 | 38 × 89 | 2.65 | 2.30 | 1.87 | 2.24 | 1.94 | 1.58 | 1.98 | 1.71 | 1.40 | |
| 38 × 140 | 3.78 | 3.28 | 2.68 | 3.20 | 2.77 | 2.26 | 2.82 | 2.44 | 1.99 | ||
| 38 × 184 | 4.61 | 3.99 | 3.26 | 3.89 | 3.37 | 2.75 | 3.43 | 2.97 | 2.43 | ||
| 38 × 235 | 5.63 | 4.88 | 3.98 | 4.76 | 4.12 | 3.37 | 4.20 | 3.64 | 2.97 | ||
| 38 × 286 | 6.53 | 5.66 | 4.62 | 5.52 | 4.78 | 3.91 | 4.87 | 4.22 | 3.44 | ||
| Construction | 38 × 89 | 3.17 | 2.88 | 2.42 | 2.77 | 2.50 | 2.04 | 2.51 | 2.21 | 1.80 | |
| Standard | 38 × 89 | 2.56 | 2.22 | 1.81 | 2.17 | 1.88 | 1.53 | 1.91 | 1.65 | 1.35 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 3.36 | 3.06 | 2.67 | 2.94 | 2.67 | 2.33 | 2.67 | 2.43 | 2.12 |
| 38 × 140 | 5.29 | 4.81 | 4.20 | 4.62 | 4.20 | 3.67 | 4.20 | 3.82 | 3.33 | ||
| 38 × 184 | 6.96 | 6.32 | 5.52 | 6.08 | 5.52 | 4.82 | 5.52 | 5.02 | 4.38 | ||
| 38 × 235 | 8.88 | 8.07 | 7.05 | 7.76 | 7.05 | 6.16 | 7.05 | 6.41 | 5.54 | ||
| 38 × 286 | 10.81 | 9.82 | 8.58 | 9.45 | 8.58 | 7.28 | 8.58 | 7.80 | 6.42 | ||
| No. 1 and No. 2 | 38 × 89 | 3.27 | 2.97 | 2.59 | 2.86 | 2.59 | 2.27 | 2.59 | 2.36 | 2.06 | |
| 38 × 140 | 5.14 | 4.67 | 4.08 | 4.49 | 4.08 | 3.50 | 4.08 | 3.71 | 3.08 | ||
| 38 × 184 | 6.76 | 6.14 | 5.04 | 5.90 | 5.21 | 4.26 | 5.31 | 4.60 | 3.75 | ||
| 38 × 235 | 8.63 | 7.54 | 6.16 | 7.36 | 6.37 | 5.20 | 6.49 | 5.62 | 4.59 | ||
| 38 × 286 | 10.11 | 8.75 | 7.15 | 8.54 | 7.40 | 6.04 | 7.53 | 6.52 | 5.33 | ||
| No. 3 | 38 × 89 | 3.17 | 2.83 | 2.31 | 2.76 | 2.39 | 1.95 | 2.44 | 2.11 | 1.72 | |
| 38 × 140 | 4.67 | 4.04 | 3.30 | 3.95 | 3.42 | 2.79 | 3.48 | 3.01 | 2.46 | ||
| 38 × 184 | 5.68 | 4.92 | 4.02 | 4.80 | 4.16 | 3.40 | 4.23 | 3.67 | 2.99 | ||
| 38 × 235 | 6.95 | 6.02 | 4.91 | 5.87 | 5.08 | 4.15 | 5.18 | 4.48 | 3.66 | ||
| 38 × 286 | 8.06 | 6.98 | 5.70 | 6.81 | 5.90 | 4.82 | 6.01 | 5.20 | 4.25 | ||
| Construction | 38 × 89 | 3.17 | 2.88 | 2.51 | 2.77 | 2.51 | 2.14 | 2.51 | 2.28 | 1.89 | |
| Standard | 38 × 89 | 2.68 | 2.32 | 1.90 | 2.27 | 1.96 | 1.60 | 2.00 | 1.73 | 1.41 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 3.22 | 2.92 | 2.55 | 2.81 | 2.55 | 2.23 | 2.55 | 2.32 | 2.03 |
| 38 × 140 | 5.06 | 4.60 | 4.02 | 4.42 | 4.02 | 3.51 | 4.02 | 3.65 | 3.19 | ||
| 38 × 184 | 6.65 | 6.05 | 5.28 | 5.81 | 5.28 | 4.61 | 5.28 | 4.80 | 4.19 | ||
| 38 × 235 | 8.50 | 7.72 | 6.74 | 7.42 | 6.74 | 5.89 | 6.74 | 6.13 | 5.35 | ||
| 38 × 286 | 10.34 | 9.40 | 8.21 | 9.03 | 8.21 | 7.17 | 8.21 | 7.46 | 6.52 | ||
| No. 1 and No. 2 | 38 × 89 | 3.11 | 2.83 | 2.47 | 2.72 | 2.47 | 2.16 | 2.47 | 2.24 | 1.96 | |
| 38 × 140 | 4.90 | 4.45 | 3.89 | 4.28 | 3.89 | 3.40 | 3.89 | 3.53 | 3.08 | ||
| 38 × 184 | 6.44 | 5.85 | 5.11 | 5.62 | 5.11 | 4.41 | 5.11 | 4.64 | 3.89 | ||
| 38 × 235 | 8.22 | 7.47 | 6.38 | 7.18 | 6.52 | 5.39 | 6.52 | 5.82 | 4.75 | ||
| 38 × 286 | 10.00 | 9.06 | 7.40 | 8.74 | 7.66 | 6.25 | 7.80 | 6.76 | 5.52 | ||
| No. 3 | 38 × 89 | 3.06 | 2.78 | 2.31 | 2.67 | 2.39 | 1.95 | 2.43 | 2.11 | 1.72 | |
| 38 × 140 | 4.67 | 4.04 | 3.30 | 3.95 | 3.42 | 2.79 | 3.48 | 3.01 | 2.46 | ||
| 38 × 184 | 5.68 | 4.92 | 4.02 | 4.80 | 4.16 | 3.40 | 4.23 | 3.67 | 2.99 | ||
| 38 × 235 | 6.95 | 6.02 | 4.91 | 5.87 | 5.08 | 4.15 | 5.18 | 4.48 | 3.66 | ||
| 38 × 286 | 8.06 | 6.98 | 5.70 | 6.81 | 5.90 | 4.82 | 6.01 | 5.20 | 4.25 | ||
| Construction | 38 × 89 | 3.06 | 2.78 | 2.43 | 2.67 | 2.43 | 2.12 | 2.43 | 2.20 | 1.93 | |
| Standard | 38 × 89 | 2.78 | 2.41 | 1.97 | 2.35 | 2.04 | 1.66 | 2.07 | 1.79 | 1.47 | |
| Northern Species (includes any Canadian species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 2.88 | 2.61 | 2.28 | 2.51 | 2.28 | 1.99 | 2.28 | 2.07 | 1.81 |
| 38 × 140 | 4.53 | 4.11 | 3.59 | 3.95 | 3.59 | 3.14 | 3.59 | 3.26 | 2.85 | ||
| 38 × 184 | 5.95 | 5.40 | 4.72 | 5.20 | 4.72 | 4.12 | 4.72 | 4.29 | 3.68 | ||
| 38 × 235 | 7.60 | 6.90 | 6.03 | 6.64 | 6.03 | 5.11 | 6.03 | 5.48 | 4.51 | ||
| 38 × 286 | 9.25 | 8.40 | 7.01 | 8.08 | 7.26 | 5.93 | 7.34 | 6.40 | 5.23 | ||
| No. 1 and No. 2 | 38 × 89 | 2.81 | 2.55 | 2.23 | 2.46 | 2.23 | 1.95 | 2.23 | 2.03 | 1.77 | |
| 38 × 140 | 4.42 | 4.02 | 3.44 | 3.86 | 3.51 | 2.91 | 3.51 | 3.14 | 2.56 | ||
| 38 × 184 | 5.81 | 5.13 | 4.19 | 5.00 | 4.33 | 3.54 | 4.41 | 3.82 | 3.12 | ||
| 38 × 235 | 7.24 | 6.27 | 5.12 | 6.12 | 5.30 | 4.33 | 5.40 | 4.67 | 3.82 | ||
| 38 × 286 | 8.40 | 7.27 | 5.94 | 7.10 | 6.15 | 5.02 | 6.26 | 5.42 | 4.43 | ||
| No. 3 | 38 × 89 | 2.62 | 2.27 | 1.85 | 2.22 | 1.92 | 1.57 | 1.95 | 1.69 | 1.38 | |
| 38 × 140 | 3.74 | 3.24 | 2.65 | 3.16 | 2.74 | 2.24 | 2.79 | 2.42 | 1.97 | ||
| 38 × 184 | 4.56 | 3.94 | 3.22 | 3.85 | 3.33 | 2.72 | 3.40 | 2.94 | 2.40 | ||
| 38 × 235 | 5.57 | 4.82 | 3.94 | 4.71 | 4.08 | 3.33 | 4.15 | 3.60 | 2.94 | ||
| 38 × 286 | 6.46 | 5.60 | 4.57 | 5.46 | 4.73 | 3.86 | 4.82 | 4.17 | 3.41 | ||
| Construction | 38 × 89 | 2.74 | 2.49 | 2.11 | 2.40 | 2.18 | 1.90 | 2.18 | 1.93 | 1.57 | |
| Standard | 38 × 89 | 2.22 | 1.93 | 1.57 | 1.88 | 1.63 | 1.33 | 1.66 | 1.44 | 1.17 | |
| Commercial Designation | Grade | Rafter Size, mm | Maximum Span, m | |||||
|---|---|---|---|---|---|---|---|---|
| Specified Snow Load, kPa | ||||||||
| 2.5 | 3.0 | |||||||
| Rafter Spacing, mm | Rafter Spacing, mm | |||||||
| 300 | 400 | 600 | 300 | 400 | 600 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 38 × 89 | 2.51 | 2.28 | 1.99 | 2.37 | 2.15 | 1.88 |
| 38 × 140 | 3.95 | 3.59 | 3.14 | 3.72 | 3.38 | 2.95 | ||
| 38 × 184 | 5.20 | 4.72 | 4.12 | 4.89 | 4.44 | 3.83 | ||
| 38 × 235 | 6.64 | 6.03 | 5.08 | 6.24 | 5.67 | 4.68 | ||
| 38 × 286 | 8.08 | 7.23 | 5.90 | 7.60 | 6.65 | 5.43 | ||
| No. 1 and No. 2 | 38 × 89 | 2.41 | 2.19 | 1.86 | 2.27 | 2.06 | 1.71 | |
| 38 × 140 | 3.76 | 3.26 | 2.66 | 3.46 | 3.00 | 2.45 | ||
| 38 × 184 | 4.58 | 3.96 | 3.24 | 4.21 | 3.65 | 2.98 | ||
| 38 × 235 | 5.60 | 4.85 | 3.96 | 5.15 | 4.46 | 3.64 | ||
| 38 × 286 | 6.50 | 5.63 | 4.59 | 5.98 | 5.17 | 4.23 | ||
| No. 3 | 38 × 89 | 1.79 | 1.55 | 1.26 | 1.64 | 1.42 | 1.16 | |
| 38 × 140 | 2.55 | 2.21 | 1.80 | 2.35 | 2.03 | 1.66 | ||
| 38 × 184 | 3.10 | 2.69 | 2.20 | 2.86 | 2.47 | 2.02 | ||
| 38 × 235 | 3.80 | 3.29 | 2.68 | 3.49 | 3.02 | 2.47 | ||
| 38 × 286 | 4.41 | 3.82 | 3.12 | 4.05 | 3.51 | 2.87 | ||
| Construction | 38 × 89 | 2.30 | 2.00 | 1.63 | 2.12 | 1.84 | 1.50 | |
| Standard | 38 × 89 | 1.73 | 1.50 | 1.22 | 1.59 | 1.38 | 1.12 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 38 × 89 | 2.48 | 2.25 | 1.97 | 2.33 | 2.12 | 1.85 |
| 38 × 140 | 3.90 | 3.54 | 3.10 | 3.67 | 3.33 | 2.91 | ||
| 38 × 184 | 5.13 | 4.66 | 4.07 | 4.82 | 4.38 | 3.77 | ||
| 38 × 235 | 6.55 | 5.95 | 5.01 | 6.16 | 5.60 | 4.61 | ||
| 38 × 286 | 7.97 | 7.12 | 5.81 | 7.50 | 6.55 | 5.34 | ||
| No. 1 and No. 2 | 38 × 89 | 2.41 | 2.19 | 1.91 | 2.27 | 2.06 | 1.80 | |
| 38 × 140 | 3.79 | 3.42 | 2.79 | 3.57 | 3.14 | 2.57 | ||
| 38 × 184 | 4.80 | 4.16 | 3.40 | 4.42 | 3.83 | 3.12 | ||
| 38 × 235 | 5.87 | 5.08 | 4.15 | 5.40 | 4.68 | 3.82 | ||
| 38 × 286 | 6.81 | 5.90 | 4.82 | 6.27 | 5.43 | 4.43 | ||
| No. 3 | 38 × 89 | 2.21 | 1.91 | 1.56 | 2.03 | 1.76 | 1.43 | |
| 38 × 140 | 3.15 | 2.73 | 2.23 | 2.90 | 2.51 | 2.05 | ||
| 38 × 184 | 3.83 | 3.32 | 2.71 | 3.52 | 3.05 | 2.49 | ||
| 38 × 235 | 4.68 | 4.06 | 3.31 | 4.31 | 3.73 | 3.05 | ||
| 38 × 286 | 5.53 | 4.71 | 3.84 | 5.00 | 4.33 | 3.54 | ||
| Commercial | 38 × 89 | 2.33 | 2.09 | 1.71 | 2.20 | 1.93 | 1.57 | |
| Standard | 38 × 89 | 1.81 | 1.57 | 1.28 | 1.66 | 1.44 | 1.18 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 38 × 89 | 2.37 | 2.15 | 1.88 | 2.23 | 2.03 | 1.77 |
| 38 × 140 | 3.73 | 3.39 | 2.96 | 3.51 | 3.19 | 2.79 | ||
| 38 × 184 | 4.90 | 4.45 | 3.89 | 4.61 | 4.19 | 3.66 | ||
| 38 × 235 | 6.26 | 5.69 | 4.97 | 5.89 | 5.35 | 4.68 | ||
| 38 × 286 | 7.62 | 6.92 | 5.90 | 7.17 | 6.52 | 5.43 | ||
| No. 1 and No. 2 | 38 × 89 | 2.29 | 2.08 | 1.82 | 2.16 | 1.96 | 1.71 | |
| 38 × 140 | 3.61 | 3.28 | 2.86 | 3.40 | 3.08 | 2.66 | ||
| 38 × 184 | 4.74 | 4.31 | 3.52 | 4.46 | 3.96 | 3.23 | ||
| 38 × 235 | 6.06 | 5.27 | 4.30 | 5.59 | 4.84 | 3.96 | ||
| 38 × 286 | 7.06 | 6.11 | 4.99 | 6.49 | 5.62 | 4.59 | ||
| No. 3 | 38 × 89 | 2.21 | 1.91 | 1.56 | 2.03 | 1.76 | 1.43 | |
| 38 × 140 | 3.15 | 2.73 | 2.23 | 2.90 | 2.51 | 2.05 | ||
| 38 × 184 | 3.83 | 3.32 | 2.71 | 3.52 | 3.05 | 2.49 | ||
| 38 × 235 | 4.68 | 4.06 | 3.31 | 4.31 | 3.73 | 3.05 | ||
| 38 × 286 | 5.43 | 4.71 | 3.84 | 5.00 | 4.33 | 3.54 | ||
| Construction | 38 × 89 | 2.25 | 2.05 | 1.77 | 2.12 | 1.93 | 1.63 | |
| Standard | 38 × 89 | 1.87 | 1.62 | 1.33 | 1.72 | 1.49 | 1.22 | |
| Northern Species (includes any Canadian species covered by the NLGA Standard Grading Rules) | Select Structural | 38 × 89 | 2.12 | 1.93 | 1.68 | 1.99 | 1.81 | 1.58 |
| 38 × 140 | 3.33 | 3.03 | 2.65 | 3.14 | 2.85 | 2.49 | ||
| 38 × 184 | 4.38 | 3.98 | 3.33 | 4.12 | 3.75 | 3.07 | ||
| 38 × 235 | 5.60 | 4.99 | 4.08 | 5.27 | 4.59 | 3.75 | ||
| 38 × 286 | 6.69 | 5.79 | 4.73 | 6.15 | 5.33 | 4.35 | ||
| No. 1 and No. 2 | 38 × 89 | 2.07 | 1.88 | 1.62 | 1.95 | 1.77 | 1.49 | |
| 38 × 140 | 3.26 | 2.84 | 2.32 | 3.02 | 2.61 | 2.13 | ||
| 38 × 184 | 3.99 | 3.46 | 2.82 | 3.67 | 3.18 | 2.60 | ||
| 38 × 235 | 4.88 | 4.23 | 3.45 | 4.49 | 3.89 | 3.17 | ||
| 38 × 286 | 5.66 | 4.90 | 4.00 | 5.21 | 4.51 | 3.68 | ||
| No. 3 | 38 × 89 | 1.77 | 1.53 | 1.25 | 1.63 | 1.41 | 1.15 | |
| 38 × 140 | 2.52 | 2.19 | 1.78 | 2.32 | 2.01 | 1.64 | ||
| 38 × 184 | 3.07 | 2.66 | 2.17 | 2.82 | 2.45 | 2.00 | ||
| 38 × 235 | 3.76 | 3.25 | 2.66 | 3.45 | 2.99 | 2.44 | ||
| 38 × 286 | 4.36 | 3.77 | 3.08 | 4.01 | 3.47 | 2.83 | ||
| Construction | 38 × 89 | 2.01 | 1.74 | 1.42 | 1.85 | 1.60 | 1.31 | |
| Standard | 38 × 89 | 1.50 | 1.30 | 1.06 | 1.38 | 1.19 | 0.98 | |
| Commercial Designation | Grade | Supported Length, m(3)(4) | Maximum Span, m(5)(6) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Size of Built-up Beam, mm | |||||||||||
| 3 – 38 × 184 | 4 – 38 × 184 | 5 – 38 × 184 | 3 – 38 × 235 | 4 – 38 × 235 | 5 – 38 × 235 | 3 – 38 × 286 | 4 – 38 × 286 | 5 – 38 × 286 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 2.4 | 3.36 | 3.70 | 3.99 | 4.30 | 4.73 | 5.09 | 5.23 | 5.66 | 5.99 |
| 3.0 | 3.12 | 3.44 | 3.70 | 3.99 | 4.39 | 4.73 | 4.84 | 5.34 | 5.66 | ||
| 3.6 | 2.94 | 3.23 | 3.48 | 3.75 | 4.13 | 4.45 | 4.41 | 5.03 | 5.41 | ||
| 4.2 | 2.79 | 3.07 | 3.31 | 3.52 | 3.92 | 4.23 | 4.09 | 4.72 | 5.14 | ||
| 4.8 | 2.67 | 2.94 | 3.17 | 3.29 | 3.75 | 4.04 | 3.82 | 4.41 | 4.92 | ||
| 5.4 | 2.54 | 2.83 | 3.04 | 3.11 | 3.59 | 3.89 | 3.60 | 4.16 | 4.65 | ||
| 6.0 | 2.41 | 2.73 | 2.94 | 2.95 | 3.40 | 3.75 | 3.42 | 3.95 | 4.41 | ||
| No. 1 and No. 2 | 2.4 | 2.97 | 3.42 | 3.82 | 3.63 | 4.19 | 4.68 | 4.21 | 4.86 | 5.43 | |
| 3.0 | 2.65 | 3.06 | 3.42 | 3.24 | 3.75 | 4.19 | 3.76 | 4.35 | 4.86 | ||
| 3.6 | 2.42 | 2.80 | 3.13 | 2.96 | 3.42 | 3.82 | 3.44 | 3.97 | 4.44 | ||
| 4.2 | 2.24 | 2.59 | 2.89 | 2.74 | 3.17 | 3.54 | 3.18 | 3.67 | 4.11 | ||
| 4.8 | 2.10 | 2.42 | 2.71 | 2.56 | 2.96 | 3.31 | 2.98 | 3.44 | 3.84 | ||
| 5.4 | 1.98 | 2.28 | 2.55 | 2.42 | 2.79 | 3.12 | 2.81 | 3.24 | 3.62 | ||
| 6.0 | 1.88 | 2.17 | 2.42 | 2.29 | 2.65 | 2.96 | 2.66 | 3.07 | 3.44 | ||
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 2.4 | 3.32 | 3.65 | 3.93 | 4.24 | 4.66 | 5.03 | 5.16 | 5.61 | 5.93 |
| 3.0 | 3.08 | 3.39 | 3.65 | 3.93 | 4.33 | 4.66 | 4.76 | 5.27 | 5.61 | ||
| 3.6 | 2.90 | 3.19 | 3.44 | 3.70 | 4.08 | 4.39 | 4.35 | 4.96 | 5.34 | ||
| 4.2 | 2.75 | 3.03 | 3.27 | 3.47 | 3.87 | 4.17 | 4.02 | 4.65 | 5.07 | ||
| 4.8 | 2.63 | 2.90 | 3.12 | 3.24 | 3.70 | 3.99 | 3.66 | 4.35 | 4.85 | ||
| 5.4 | 2.49 | 2.79 | 3.00 | 2.95 | 3.53 | 3.83 | 3.32 | 4.10 | 4.58 | ||
| 6.0 | 2.28 | 2.69 | 2.90 | 2.70 | 3.35 | 3.70 | 3.04 | 3.87 | 4.35 | ||
| No. 1 and No. 2 | 2.4 | 3.11 | 3.55 | 3.82 | 3.80 | 4.39 | 4.88 | 4.41 | 5.10 | 5.70 | |
| 3.0 | 2.78 | 3.21 | 3.55 | 3.40 | 3.93 | 4.39 | 3.95 | 4.56 | 5.10 | ||
| 3.6 | 2.54 | 2.93 | 3.28 | 3.11 | 3.59 | 4.01 | 3.60 | 4.16 | 4.65 | ||
| 4.2 | 2.35 | 2.72 | 3.04 | 2.88 | 3.32 | 3.71 | 3.34 | 3.85 | 4.31 | ||
| 4.8 | 2.20 | 2.54 | 2.84 | 2.69 | 3.11 | 3.47 | 3.12 | 3.60 | 4.03 | ||
| 5.4 | 2.07 | 2.39 | 2.68 | 2.54 | 2.93 | 3.27 | 2.94 | 3.40 | 3.80 | ||
| 6.0 | 1.97 | 2.27 | 2.54 | 2.41 | 2.78 | 3.11 | 2.79 | 3.22 | 3.60 | ||
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 2.4 | 3.17 | 3.49 | 3.76 | 4.05 | 4.46 | 4.81 | 4.93 | 5.42 | 5.73 |
| 3.0 | 2.95 | 3.24 | 3.49 | 3.76 | 4.14 | 4.46 | 4.58 | 5.04 | 5.42 | ||
| 3.6 | 2.77 | 3.05 | 3.29 | 3.54 | 3.90 | 4.20 | 4.31 | 4.74 | 5.11 | ||
| 4.2 | 2.63 | 2.90 | 3.12 | 3.36 | 3.70 | 3.99 | 4.09 | 4.51 | 4.85 | ||
| 4.8 | 2.52 | 2.77 | 2.99 | 3.22 | 3.54 | 3.81 | 3.82 | 4.31 | 4.64 | ||
| 5.4 | 2.42 | 2.67 | 2.87 | 3.09 | 3.41 | 3.67 | 3.60 | 4.14 | 4.46 | ||
| 6.0 | 2.34 | 2.57 | 2.77 | 2.95 | 3.29 | 3.54 | 3.32 | 3.95 | 4.31 | ||
| No. 1 and No. 2 | 2.4 | 3.07 | 3.38 | 3.64 | 3.92 | 4.32 | 4.65 | 4.57 | 5.25 | 5.59 | |
| 3.0 | 2.85 | 3.14 | 3.38 | 3.52 | 4.01 | 4.32 | 4.09 | 4.72 | 5.25 | ||
| 3.6 | 2.63 | 2.95 | 3.18 | 3.22 | 3.71 | 4.06 | 3.73 | 4.31 | 4.82 | ||
| 4.2 | 2.44 | 2.80 | 3.02 | 2.98 | 3.44 | 3.84 | 3.46 | 3.99 | 4.46 | ||
| 4.8 | 2.28 | 2.63 | 2.89 | 2.79 | 3.22 | 3.60 | 3.23 | 3.73 | 4.17 | ||
| 5.4 | 2.15 | 2.48 | 2.77 | 2.63 | 3.03 | 3.39 | 3.05 | 3.52 | 3.93 | ||
| 6.0 | 2.04 | 2.35 | 2.63 | 2.49 | 2.88 | 3.22 | 2.89 | 3.34 | 3.73 | ||
| Northern Species (includes any Canadian species covered by the NLGA Standard Grading Rules) | Select Structural | 2.4 | 2.84 | 3.12 | 3.36 | 3.62 | 3.99 | 4.30 | 4.33 | 4.85 | 5.23 |
| 3.0 | 2.63 | 2.90 | 3.12 | 3.34 | 3.70 | 3.99 | 3.88 | 4.47 | 4.85 | ||
| 3.6 | 2.48 | 2.73 | 2.94 | 3.05 | 3.48 | 3.75 | 3.54 | 4.08 | 4.57 | ||
| 4.2 | 2.31 | 2.59 | 2.79 | 2.82 | 3.26 | 3.57 | 3.28 | 3.78 | 4.23 | ||
| 4.8 | 2.16 | 2.48 | 2.67 | 2.64 | 3.05 | 3.41 | 3.06 | 3.54 | 3.96 | ||
| 5.4 | 2.04 | 2.35 | 2.57 | 2.49 | 2.87 | 3.21 | 2.89 | 3.34 | 3.73 | ||
| 6.0 | 1.93 | 2.23 | 2.48 | 2.36 | 2.73 | 3.05 | 2.74 | 3.16 | 3.54 | ||
| No. 1 and No. 2 | 2.4 | 2.59 | 2.99 | 3.29 | 3.16 | 3.65 | 4.08 | 3.67 | 4.24 | 4.74 | |
| 3.0 | 2.31 | 2.67 | 2.99 | 2.83 | 3.27 | 3.65 | 3.28 | 3.79 | 4.24 | ||
| 3.6 | 2.11 | 2.44 | 2.73 | 2.58 | 2.98 | 3.33 | 3.00 | 3.46 | 3.87 | ||
| 4.2 | 1.95 | 2.26 | 2.52 | 2.39 | 2.76 | 3.09 | 2.77 | 3.20 | 3.58 | ||
| 4.8 | 1.83 | 2.11 | 2.36 | 2.24 | 2.58 | 2.89 | 2.59 | 3.00 | 3.35 | ||
| 5.4 | 1.72 | 1.99 | 2.23 | 2.11 | 2.43 | 2.72 | 2.45 | 2.82 | 3.16 | ||
| 6.0 | 1.64 | 1.89 | 2.11 | 2.00 | 2.31 | 2.58 | 2.32 | 2.68 | 3.00 | ||
Notes to Table 9.23.4.2.-H:
(1)
Beam spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
When the floors have a concrete topping of not more than 51 mm, the spans must be multiplied by 0.8.
(3)
Supported length means half the sum of the joists spans on both sides of the beam.
(4)
Straight interpolation may be used for other supported lengths.
(5)
Spans are clear spans between supports. For total span, add two bearing lengths.
(6)
3-ply beams with supported lengths greater than 4.2 m require minimum bearing length of 114 mm. All other beams require minimum bearing length of 76 mm.
| Commercial Designation | Grade | Supported Length, m(3)(4) | Maximum Span, m(5)(6) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Size of Built-up Beam, mm | |||||||||||
| 3 – 38 × 184 | 4 – 38 × 184 | 5 – 38 × 184 | 3 – 38 × 235 | 4 – 38 × 235 | 5 – 38 × 235 | 3 – 38 × 286 | 4 – 38 × 286 | 5 – 38 × 286 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 2.4 | 2.80 | 3.08 | 3.32 | 3.49 | 3.93 | 4.24 | 4.05 | 4.67 | 5.16 |
| 3.0 | 2.55 | 2.86 | 3.08 | 3.12 | 3.60 | 3.93 | 3.62 | 4.18 | 4.67 | ||
| 3.6 | 2.33 | 2.69 | 2.90 | 2.85 | 3.29 | 3.68 | 3.30 | 3.82 | 4.27 | ||
| 4.2 | 2.16 | 2.49 | 2.75 | 2.64 | 3.04 | 3.40 | 2.99 | 3.53 | 3.95 | ||
| 4.8 | 2.00 | 2.33 | 2.60 | 2.38 | 2.85 | 3.18 | 2.69 | 3.30 | 3.69 | ||
| 5.4 | 1.82 | 2.20 | 2.45 | 2.17 | 2.68 | 3.00 | 2.45 | 3.08 | 3.48 | ||
| 6.0 | 1.67 | 2.08 | 2.33 | 2.00 | 2.51 | 2.85 | 2.26 | 2.83 | 3.30 | ||
| No. 1 and No. 2 | 2.4 | 2.22 | 2.56 | 2.87 | 2.72 | 3.14 | 3.51 | 3.15 | 3.64 | 4.07 | |
| 3.0 | 1.99 | 2.29 | 2.56 | 2.43 | 2.80 | 3.14 | 2.82 | 3.25 | 3.64 | ||
| 3.6 | 1.81 | 2.09 | 2.34 | 2.22 | 2.56 | 2.86 | 2.57 | 2.97 | 3.32 | ||
| 4.2 | 1.68 | 1.94 | 2.17 | 2.05 | 2.37 | 2.65 | 2.38 | 2.75 | 3.07 | ||
| 4.8 | 1.57 | 1.81 | 2.03 | 1.92 | 2.22 | 2.48 | 2.23 | 2.57 | 2.88 | ||
| 5.4 | 1.48 | 1.71 | 1.91 | 1.81 | 2.09 | 2.34 | 2.10 | 2.43 | 2.71 | ||
| 6.0 | 1.40 | 1.62 | 1.81 | 1.72 | 1.98 | 2.22 | 1.99 | 2.30 | 2.57 | ||
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 2.4 | 2.76 | 3.04 | 3.27 | 3.43 | 3.88 | 4.18 | 3.99 | 4.60 | 5.09 |
| 3.0 | 2.51 | 2.82 | 3.04 | 2.97 | 3.55 | 3.88 | 3.34 | 4.12 | 4.60 | ||
| 3.6 | 2.15 | 2.65 | 2.86 | 2.56 | 3.24 | 3.62 | 2.88 | 3.65 | 4.20 | ||
| 4.2 | 1.90 | 2.40 | 2.72 | 2.26 | 2.85 | 3.35 | 2.55 | 3.21 | 3.87 | ||
| 4.8 | 1.70 | 2.15 | 2.56 | 2.03 | 2.56 | 3.08 | 2.30 | 2.88 | 3.46 | ||
| 5.4 | 1.56 | 1.95 | 2.35 | 1.86 | 2.32 | 2.79 | 2.11 | 2.62 | 3.14 | ||
| 6.0 | 1.44 | 1.79 | 2.15 | 1.72 | 2.14 | 2.56 | 1.96 | 2.42 | 2.88 | ||
| No. 1 and No. 2 | 2.4 | 2.33 | 2.69 | 3.01 | 2.85 | 3.29 | 3.68 | 3.30 | 3.82 | 4.27 | |
| 3.0 | 2.08 | 2.41 | 2.69 | 2.55 | 2.94 | 3.29 | 2.96 | 3.41 | 3.82 | ||
| 3.6 | 1.90 | 2.20 | 2.45 | 2.33 | 2.68 | 3.00 | 2.70 | 3.12 | 3.48 | ||
| 4.2 | 1.76 | 2.03 | 2.27 | 2.15 | 2.49 | 2.78 | 2.50 | 2.88 | 3.22 | ||
| 4.8 | 1.65 | 1.90 | 2.13 | 2.01 | 2.33 | 2.60 | 2.30 | 2.70 | 3.02 | ||
| 5.4 | 1.55 | 1.79 | 2.00 | 1.86 | 2.19 | 2.45 | 2.11 | 2.54 | 2.84 | ||
| 6.0 | 1.44 | 1.70 | 1.90 | 1.72 | 2.08 | 2.33 | 1.96 | 2.41 | 2.70 | ||
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 2.4 | 2.64 | 2.91 | 3.13 | 3.37 | 3.71 | 4.00 | 4.05 | 4.52 | 4.87 |
| 3.0 | 2.45 | 2.70 | 2.91 | 3.12 | 3.45 | 3.71 | 3.62 | 4.18 | 4.52 | ||
| 3.6 | 2.31 | 2.54 | 2.73 | 2.79 | 3.24 | 3.49 | 3.14 | 3.82 | 4.25 | ||
| 4.2 | 2.07 | 2.41 | 2.60 | 2.46 | 3.04 | 3.32 | 2.77 | 3.50 | 3.95 | ||
| 4.8 | 1.85 | 2.31 | 2.48 | 2.21 | 2.79 | 3.17 | 2.50 | 3.14 | 3.69 | ||
| 5.4 | 1.69 | 2.13 | 2.39 | 2.02 | 2.53 | 3.00 | 2.28 | 2.85 | 3.42 | ||
| 6.0 | 1.56 | 1.95 | 2.31 | 1.86 | 2.32 | 2.79 | 2.11 | 2.62 | 3.14 | ||
| No. 1 and No. 2 | 2.4 | 2.41 | 2.79 | 3.03 | 2.95 | 3.41 | 3.81 | 3.42 | 3.95 | 4.42 | |
| 3.0 | 2.16 | 2.49 | 2.79 | 2.64 | 3.05 | 3.41 | 3.06 | 3.53 | 3.95 | ||
| 3.6 | 1.97 | 2.27 | 2.54 | 2.41 | 2.78 | 3.11 | 2.79 | 3.23 | 3.61 | ||
| 4.2 | 1.82 | 2.11 | 2.35 | 2.23 | 2.57 | 2.88 | 2.59 | 2.99 | 3.34 | ||
| 4.8 | 1.71 | 1.97 | 2.20 | 2.09 | 2.41 | 2.69 | 2.42 | 2.79 | 3.12 | ||
| 5.4 | 1.61 | 1.86 | 2.08 | 1.97 | 2.27 | 2.54 | 2.28 | 2.63 | 2.95 | ||
| 6.0 | 1.53 | 1.76 | 1.97 | 1.86 | 2.15 | 2.41 | 2.11 | 2.50 | 2.79 | ||
| Northern Species (includes any Canadian species covered by the NLGA Standard Grading Rules) | Select Structural | 2.4 | 2.29 | 2.60 | 2.80 | 2.80 | 3.23 | 3.57 | 3.24 | 3.75 | 4.19 |
| 3.0 | 2.04 | 2.36 | 2.60 | 2.50 | 2.89 | 3.23 | 2.90 | 3.35 | 3.75 | ||
| 3.6 | 1.87 | 2.16 | 2.41 | 2.28 | 2.64 | 2.95 | 2.65 | 3.06 | 3.42 | ||
| 4.2 | 1.73 | 2.00 | 2.23 | 2.11 | 2.44 | 2.73 | 2.45 | 2.83 | 3.17 | ||
| 4.8 | 1.62 | 1.87 | 2.09 | 1.98 | 2.28 | 2.55 | 2.29 | 2.65 | 2.96 | ||
| 5.4 | 1.52 | 1.76 | 1.97 | 1.86 | 2.15 | 2.41 | 2.11 | 2.50 | 2.79 | ||
| 6.0 | 1.44 | 1.67 | 1.87 | 1.72 | 2.04 | 2.28 | 1.96 | 2.37 | 2.65 | ||
| No. 1 and No. 2 | 2.4 | 1.94 | 2.24 | 2.50 | 2.37 | 2.73 | 3.06 | 2.75 | 3.17 | 3.55 | |
| 3.0 | 1.73 | 2.00 | 2.24 | 2.12 | 2.44 | 2.73 | 2.46 | 2.84 | 3.17 | ||
| 3.6 | 1.58 | 1.83 | 2.04 | 1.93 | 2.23 | 2.50 | 2.24 | 2.59 | 2.90 | ||
| 4.2 | 1.46 | 1.69 | 1.89 | 1.79 | 2.07 | 2.31 | 2.08 | 2.40 | 2.68 | ||
| 4.8 | 1.37 | 1.58 | 1.77 | 1.67 | 1.93 | 2.16 | 1.94 | 2.24 | 2.51 | ||
| 5.4 | 1.29 | 1.49 | 1.67 | 1.58 | 1.82 | 2.04 | 1.83 | 2.11 | 2.36 | ||
| 6.0 | 1.22 | 1.41 | 1.58 | 1.50 | 1.73 | 1.93 | 1.74 | 2.01 | 2.24 | ||
Notes to Table 9.23.4.2.-I:
(1)
Beam spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
When the floors have a concrete topping of not more than 51 mm, the spans must be multiplied by 0.8.
(3)
Supported length means half the sum of the joists spans on both sides of the beam.
(4)
Straight interpolation may be used for other supported lengths.
(5)
Spans are clear spans between supports. For total span, add two bearing lengths.
(6)
3-ply beams require minimum bearing length of 114 mm. 4-ply and 5-ply beams with supported lengths greater than 3 m require minimum bearing length of 114 mm. All other beams require minimum bearing length of 76 mm.
| Commercial Designation | Grade | Supported Length, m(3)(4) | Maximum Span, m(5)(6) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Size of Built-up Beam, mm | |||||||||||
| 3 – 38 × 184 | 4 – 38 × 184 | 5 – 38 × 184 | 3 – 38 × 235 | 4 – 38 × 235 | 5 – 38 × 235 | 3 – 38 × 286 | 4 – 38 × 286 | 5 – 38 × 286 | |||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | Select Structural | 2.4 | 2.38 | 2.74 | 2.95 | 2.91 | 3.36 | 3.75 | 3.37 | 3.89 | 4.35 |
| 3.0 | 2.13 | 2.46 | 2.74 | 2.60 | 3.00 | 3.36 | 2.92 | 3.48 | 3.89 | ||
| 3.6 | 1.88 | 2.24 | 2.51 | 2.24 | 2.74 | 3.06 | 2.53 | 3.18 | 3.56 | ||
| 4.2 | 1.66 | 2.08 | 2.32 | 1.99 | 2.49 | 2.84 | 2.25 | 2.81 | 3.29 | ||
| 4.8 | 1.50 | 1.88 | 2.17 | 1.80 | 2.24 | 2.65 | 2.04 | 2.53 | 3.02 | ||
| 5.4 | 1.38 | 1.71 | 2.05 | 1.65 | 2.04 | 2.44 | 1.88 | 2.31 | 2.75 | ||
| 6.0 | 1.28 | 1.58 | 1.88 | 1.53 | 1.89 | 2.24 | 1.75 | 2.14 | 2.53 | ||
| No. 1 and No. 2 | 2.4 | 1.85 | 2.14 | 2.39 | 2.26 | 2.61 | 2.92 | 2.63 | 3.03 | 3.39 | |
| 3.0 | 1.66 | 1.91 | 2.14 | 2.02 | 2.34 | 2.61 | 2.35 | 2.71 | 3.03 | ||
| 3.6 | 1.51 | 1.74 | 1.95 | 1.85 | 2.13 | 2.39 | 2.14 | 2.48 | 2.77 | ||
| 4.2 | 1.40 | 1.62 | 1.81 | 1.71 | 1.98 | 2.21 | 1.99 | 2.29 | 2.56 | ||
| 4.8 | 1.31 | 1.51 | 1.69 | 1.60 | 1.85 | 2.07 | 1.86 | 2.14 | 2.40 | ||
| 5.4 | 1.23 | 1.42 | 1.59 | 1.51 | 1.74 | 1.95 | 1.75 | 2.02 | 2.26 | ||
| 6.0 | 1.17 | 1.35 | 1.51 | 1.43 | 1.65 | 1.85 | 1.66 | 1.92 | 2.14 | ||
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | Select Structural | 2.4 | 2.22 | 2.70 | 2.91 | 2.64 | 3.31 | 3.70 | 2.98 | 3.78 | 4.29 |
| 3.0 | 1.85 | 2.35 | 2.70 | 2.21 | 2.79 | 3.31 | 2.50 | 3.14 | 3.78 | ||
| 3.6 | 1.61 | 2.02 | 2.43 | 1.92 | 2.40 | 2.89 | 2.18 | 2.71 | 3.24 | ||
| 4.2 | 1.43 | 1.78 | 2.14 | 1.71 | 2.13 | 2.54 | 1.95 | 2.40 | 2.86 | ||
| 4.8 | 1.30 | 1.61 | 1.92 | 1.56 | 1.92 | 2.28 | 1.77 | 2.18 | 2.58 | ||
| 5.4 | 1.19 | 1.47 | 1.74 | 1.44 | 1.76 | 2.08 | 1.64 | 2.00 | 2.35 | ||
| 6.0 | 1.11 | 1.36 | 1.61 | 1.34 | 1.63 | 1.92 | 1.53 | 1.85 | 2.18 | ||
| No. 1 and No. 2 | 2.4 | 1.94 | 2.24 | 2.51 | 2.37 | 2.74 | 3.06 | 2.75 | 3.18 | 3.56 | |
| 3.0 | 1.74 | 2.00 | 2.24 | 2.12 | 2.45 | 2.74 | 2.46 | 2.84 | 3.18 | ||
| 3.6 | 1.58 | 1.83 | 2.05 | 1.92 | 2.24 | 2.50 | 2.18 | 2.60 | 2.90 | ||
| 4.2 | 1.43 | 1.69 | 1.89 | 1.71 | 2.07 | 2.32 | 1.95 | 2.40 | 2.69 | ||
| 4.8 | 1.30 | 1.58 | 1.77 | 1.56 | 1.92 | 2.17 | 1.77 | 2.18 | 2.51 | ||
| 5.4 | 1.19 | 1.47 | 1.67 | 1.44 | 1.76 | 2.04 | 1.64 | 2.00 | 2.35 | ||
| 6.0 | 1.11 | 1.36 | 1.58 | 1.34 | 1.63 | 1.92 | 1.53 | 1.85 | 2.18 | ||
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | Select Structural | 2.4 | 2.35 | 2.58 | 2.78 | 2.89 | 3.30 | 3.55 | 3.24 | 3.89 | 4.33 |
| 3.0 | 2.02 | 2.40 | 2.58 | 2.40 | 3.00 | 3.30 | 2.71 | 3.42 | 3.89 | ||
| 3.6 | 1.74 | 2.20 | 2.43 | 2.08 | 2.62 | 3.06 | 2.35 | 2.95 | 3.54 | ||
| 4.2 | 1.55 | 1.94 | 2.31 | 1.85 | 2.31 | 2.77 | 2.10 | 2.61 | 3.12 | ||
| 4.8 | 1.40 | 1.74 | 2.09 | 1.68 | 2.08 | 2.48 | 1.91 | 2.35 | 2.80 | ||
| 5.4 | 1.28 | 1.59 | 1.90 | 1.54 | 1.90 | 2.26 | 1.76 | 2.16 | 2.55 | ||
| 6.0 | 1.19 | 1.47 | 1.74 | 1.44 | 1.76 | 2.08 | 1.64 | 2.00 | 2.35 | ||
| No. 1 and No. 2 | 2.4 | 2.01 | 2.32 | 2.60 | 2.46 | 2.84 | 3.17 | 2.85 | 3.29 | 3.68 | |
| 3.0 | 1.80 | 2.08 | 2.32 | 2.20 | 2.54 | 2.84 | 2.55 | 2.95 | 3.29 | ||
| 3.6 | 1.64 | 1.90 | 2.12 | 2.01 | 2.32 | 2.59 | 2.33 | 2.69 | 3.01 | ||
| 4.2 | 1.52 | 1.75 | 1.96 | 1.85 | 2.15 | 2.40 | 2.10 | 2.49 | 2.78 | ||
| 4.8 | 1.40 | 1.64 | 1.84 | 1.68 | 2.01 | 2.24 | 1.91 | 2.33 | 2.60 | ||
| 5.4 | 1.28 | 1.55 | 1.73 | 1.54 | 1.89 | 2.12 | 1.76 | 2.16 | 2.46 | ||
| 6.0 | 1.19 | 1.47 | 1.64 | 1.44 | 1.76 | 2.01 | 1.64 | 2.00 | 2.33 | ||
| Northern Species (includes any Canadian species covered by the NLGA Standard Grading Rules) | Select Structural | 2.4 | 1.91 | 2.20 | 2.46 | 2.33 | 2.69 | 3.01 | 2.70 | 3.12 | 3.49 |
| 3.0 | 1.70 | 1.97 | 2.20 | 2.08 | 2.41 | 2.69 | 2.42 | 2.79 | 3.12 | ||
| 3.6 | 1.56 | 1.80 | 2.01 | 1.90 | 2.20 | 2.46 | 2.18 | 2.55 | 2.85 | ||
| 4.2 | 1.43 | 1.66 | 1.86 | 1.71 | 2.03 | 2.27 | 1.95 | 2.36 | 2.64 | ||
| 4.8 | 1.30 | 1.56 | 1.74 | 1.56 | 1.90 | 2.13 | 1.77 | 2.18 | 2.47 | ||
| 5.4 | 1.19 | 1.47 | 1.64 | 1.44 | 1.76 | 2.01 | 1.64 | 2.00 | 2.33 | ||
| 6.0 | 1.11 | 1.36 | 1.56 | 1.34 | 1.63 | 1.90 | 1.53 | 1.85 | 2.18 | ||
| No. 1 and No. 2 | 2.4 | 1.61 | 1.86 | 2.08 | 1.97 | 2.28 | 2.55 | 2.29 | 2.64 | 2.96 | |
| 3.0 | 1.44 | 1.67 | 1.86 | 1.76 | 2.04 | 2.28 | 2.05 | 2.36 | 2.64 | ||
| 3.6 | 1.32 | 1.52 | 1.70 | 1.61 | 1.86 | 2.08 | 1.87 | 2.16 | 2.41 | ||
| 4.2 | 1.22 | 1.41 | 1.57 | 1.49 | 1.72 | 1.93 | 1.73 | 2.00 | 2.23 | ||
| 4.8 | 1.14 | 1.32 | 1.47 | 1.40 | 1.61 | 1.80 | 1.62 | 1.87 | 2.09 | ||
| 5.4 | 1.08 | 1.24 | 1.39 | 1.32 | 1.52 | 1.70 | 1.53 | 1.76 | 1.97 | ||
| 6.0 | 1.02 | 1.18 | 1.32 | 1.25 | 1.44 | 1.61 | 1.45 | 1.67 | 1.87 | ||
Notes to Table 9.23.4.2.-J:
(1)
Beam spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
When the floors have a concrete topping of not more than 51 mm, the spans must be multiplied by 0.8.
(3)
Supported length means half the sum of the joists spans on both sides of the beam.
(4)
Straight interpolation may be used for other supported lengths.
(5)
Spans are clear spans between supports. For total span, add two bearing lengths.
(6)
3-ply beams with supported lengths greater than 4.2 m require minimum bearing length of 152 mm. All other beams require minimum bearing length of 114 mm.
| Number of Storeys Supported | Beam Width, mm | Supported Length, m(2)(3) | Maximum Span, m(4)(5)(6)(7) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Beam Depth, mm | |||||||||
| 228 | 266 | 304 | 342 | 380 | 418 | 456 | |||
| 1 | 80 | 2.4 | 4.32 | 5.04 | 5.76 | 6.48 | 7.20 | 7.92 | 8.64 |
| 3.0 | 3.87 | 4.51 | 5.15 | 5.80 | 6.44 | 7.09 | 7.73 | ||
| 3.6 | 3.53 | 4.12 | 4.70 | 5.29 | 5.88 | 6.47 | 7.06 | ||
| 4.2 | 3.27 | 3.81 | 4.36 | 4.90 | 5.44 | 5.99 | 6.53 | ||
| 4.8 | 3.06 | 3.57 | 4.07 | 4.58 | 5.09 | 5.60 | 6.11 | ||
| 5.4 | 2.88 | 3.36 | 3.84 | 4.32 | 4.80 | 5.28 | 5.76 | ||
| 6.0 | 2.73 | 3.19 | 3.64 | 4.10 | 4.56 | 5.01 | 5.47 | ||
| 130 | 2.4 | 5.51 | 6.43 | 7.35 | 8.26 | 9.18 | 10.10 | 11.02 | |
| 3.0 | 4.93 | 5.75 | 6.57 | 7.39 | 8.21 | 9.03 | 9.86 | ||
| 3.6 | 4.50 | 5.25 | 6.00 | 6.75 | 7.50 | 8.25 | 9.00 | ||
| 4.2 | 4.16 | 4.86 | 5.55 | 6.25 | 6.94 | 7.64 | 8.33 | ||
| 4.8 | 3.90 | 4.54 | 5.19 | 5.84 | 6.49 | 7.14 | 7.79 | ||
| 5.4 | 3.67 | 4.28 | 4.90 | 5.51 | 6.12 | 6.73 | 7.35 | ||
| 6.0 | 3.48 | 4.07 | 4.65 | 5.23 | 5.81 | 6.39 | 6.97 | ||
| 2 | 80 | 2.4 | 3.28 | 3.83 | 4.37 | 4.92 | 5.47 | 6.01 | 6.56 |
| 3.0 | 2.93 | 3.42 | 3.91 | 4.40 | 4.89 | 5.38 | 5.87 | ||
| 3.6 | 2.68 | 3.12 | 3.57 | 4.02 | 4.46 | 4.91 | 5.36 | ||
| 4.2 | 2.48 | 2.89 | 3.31 | 3.72 | 4.13 | 4.54 | 4.96 | ||
| 4.8 | 2.32 | 2.71 | 3.09 | 3.48 | 3.86 | 4.25 | 4.64 | ||
| 5.4 | 2.19 | 2.55 | 2.91 | 3.28 | 3.64 | 4.01 | 4.37 | ||
| 6.0 | 2.07 | 2.42 | 2.77 | 3.11 | 3.46 | 3.80 | 4.15 | ||
| 130 | 2.4 | 4.18 | 4.88 | 5.57 | 6.27 | 6.97 | 7.66 | 8.36 | |
| 3.0 | 3.74 | 4.36 | 4.99 | 5.61 | 6.23 | 6.85 | 7.48 | ||
| 3.6 | 3.41 | 3.98 | 4.55 | 5.12 | 5.69 | 6.26 | 6.83 | ||
| 4.2 | 3.16 | 3.69 | 4.21 | 4.74 | 5.27 | 5.79 | 6.32 | ||
| 4.8 | 2.96 | 3.45 | 3.94 | 4.43 | 4.93 | 5.42 | 5.91 | ||
| 5.4 | 2.79 | 3.25 | 3.72 | 4.18 | 4.64 | 5.11 | 5.57 | ||
| 6.0 | 2.64 | 3.08 | 3.53 | 3.97 | 4.41 | 4.85 | 5.29 | ||
| 3 | 80 | 2.4 | 2.75 | 3.21 | 3.66 | 4.12 | 4.58 | 5.04 | 5.50 |
| 3.0 | 2.46 | 2.87 | 3.28 | 3.69 | 4.10 | 4.51 | 4.92 | ||
| 3.6 | 2.24 | 2.62 | 2.99 | 3.37 | 3.74 | 4.11 | 4.49 | ||
| 4.2 | 2.08 | 2.42 | 2.77 | 3.12 | 3.46 | 3.81 | 4.15 | ||
| 4.8 | 1.94 | 2.27 | 2.59 | 2.91 | 3.24 | 3.56 | 3.89 | ||
| 5.4 | 1.83 | 2.14 | 2.44 | 2.75 | 3.05 | 3.36 | 3.66 | ||
| 6.0 | 1.74 | 2.03 | 2.32 | 2.61 | 2.90 | 3.19 | 3.48 | ||
| 130 | 2.4 | 3.50 | 4.09 | 4.67 | 5.25 | 5.84 | 6.42 | 7.01 | |
| 3.0 | 3.13 | 3.66 | 4.18 | 4.70 | 5.22 | 5.74 | 6.27 | ||
| 3.6 | 2.86 | 3.34 | 3.81 | 4.29 | 4.77 | 5.24 | 5.72 | ||
| 4.2 | 2.65 | 3.09 | 3.53 | 3.97 | 4.41 | 4.85 | 5.30 | ||
| 4.8 | 2.48 | 2.89 | 3.30 | 3.72 | 4.13 | 4.54 | 4.95 | ||
| 5.4 | 2.34 | 2.72 | 3.11 | 3.50 | 3.89 | 4.28 | 4.67 | ||
| 6.0 | 2.22 | 2.58 | 2.95 | 3.32 | 3.69 | 4.06 | 4.43 | ||
Notes to Table 9.23.4.2.-K:
(1)
Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floor does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)
Supported length means half the sum of the joist spans on both sides of the beam.
(3)
Straight interpolation may be used for other supported lengths.
(4)
Spans are valid for glued-laminated timber conforming to CAN/CSA-O122 and CSA O177.
(5)
Spans are clear spans between supports. For total span, add two bearing lengths.
(6)
Provide a minimum bearing length of 89 mm. (Alternatively, the bearing length may be designed in accordance with Part 4.)
(7)
Top edge of beam assumed to be fully laterally supported by joists.
| Commercial Designation | Beam or Lintel Size, mm | Maximum Span, m(1)(2)(3) | ||||
|---|---|---|---|---|---|---|
| Specified Snow Load, kPa | ||||||
| 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | ||
| Douglas Fir – Larch (includes Douglas Fir and Western Larch) | 3 – 38 × 184 | 2.65 | 2.28 | 2.03 | 1.85 | 1.71 |
| 4 – 38 × 184 | 3.06 | 2.64 | 2.35 | 2.14 | 1.97 | |
| 5 – 38 × 184 | 3.43 | 2.95 | 2.62 | 2.39 | 2.21 | |
| 3 – 38 × 235 | 3.25 | 2.79 | 2.49 | 2.26 | 2.09 | |
| 4 – 38 × 235 | 3.75 | 3.22 | 2.87 | 2.61 | 2.41 | |
| 5 – 38 × 235 | 4.19 | 3.60 | 3.21 | 2.92 | 2.70 | |
| 3 – 38 × 286 | 3.77 | 3.24 | 2.88 | 2.62 | 2.43 | |
| 4 – 38 × 286 | 4.35 | 3.74 | 3.33 | 3.03 | 2.80 | |
| 5 – 38 × 286 | 4.86 | 4.18 | 3.72 | 3.39 | 3.13 | |
| Hem – Fir (includes Western Hemlock and Amabilis Fir) | 3 – 38 × 184 | 2.78 | 2.39 | 2.13 | 1.94 | 1.79 |
| 4 – 38 × 184 | 3.21 | 2.76 | 2.46 | 2.24 | 2.07 | |
| 5 – 38 × 184 | 3.59 | 3.09 | 2.75 | 2.50 | 2.31 | |
| 3 – 38 × 235 | 3.40 | 2.93 | 2.61 | 2.37 | 2.19 | |
| 4 – 38 × 235 | 3.93 | 3.38 | 3.01 | 2.74 | 2.53 | |
| 5 – 38 × 235 | 4.39 | 3.78 | 3.36 | 3.06 | 2.83 | |
| 3 – 38 × 286 | 3.95 | 3.40 | 3.02 | 2.75 | 2.54 | |
| 4 – 38 × 286 | 4.56 | 3.92 | 3.49 | 3.18 | 2.94 | |
| 5 – 38 × 286 | 5.10 | 4.38 | 3.90 | 3.55 | 3.28 | |
| Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir) | 3 – 38 × 184 | 2.88 | 2.48 | 2.21 | 2.01 | 1.86 |
| 4 – 38 × 184 | 3.30 | 2.86 | 2.55 | 2.32 | 2.14 | |
| 5 – 38 × 184 | 3.55 | 3.10 | 2.82 | 2.59 | 2.40 | |
| 3 – 38 × 235 | 3.53 | 3.03 | 2.70 | 2.46 | 2.27 | |
| 4 – 38 × 235 | 4.07 | 3.50 | 3.12 | 2.84 | 2.62 | |
| 5 – 38 × 235 | 4.54 | 3.91 | 3.49 | 3.17 | 2.93 | |
| 3 – 38 × 286 | 4.09 | 3.52 | 3.13 | 2.85 | 2.63 | |
| 4 – 38 × 286 | 4.72 | 4.06 | 3.62 | 3.29 | 3.04 | |
| 5 – 38 × 286 | 5.28 | 4.54 | 4.04 | 3.68 | 3.40 | |
Notes to Table 9.23.4.2.-L:
(1)
Beam and lintel spans are calculated based on a maximum supported length of 4.9 m. Spans may be increased by 5% for supported lengths of not more than 4.3 m, by 10% for supported lengths of not more than 3.7 m, and by 25% for supported lengths of not more than 2.4 m.
(2)
For ridge beams, supported length means half the sum of the rafter, joist or truss spans on both sides of the beam. For lintels, supported length means half the sum of truss, roof joist or rafter spans supported by the lintel plus the length of the overhang beyond the lintel.
(3)
Provide a minimum bearing length of 76 mm.
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