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Canadian Wood CouncilFederated AssociationsAlberta ForestForest ProductsProductsAlbertaAssociation (AFPA)(AFPA)AssociationTel: cts.cawww.albertaforestproducts.caCouncil ofof ForestForest IndustriesIndustriesCouncil(COFI)(COFI)Tel: rgAPA –– EngineeredEngineeredAPAWood SystemsSystemsWoodTel: wood.orgMHI CanadaCanadaMHITel: hcanada.caCanadian WoodWood TrussTrussCanadianAssociation (CWTA)(CWTA)AssociationTel: cwta.telus.netCertiWood CertiWood Tel: ertiwood.comCoast ForestForest ProductsProductsCoastAssociationAssociationTel: .coastforest.orgOntario ForestForest IndustriesIndustriesOntarioAssociation (Home(Home ofof CLACLAAssociationGrading andand Inspection)Inspection)GradingTel: omMaritime LumberLumberMaritimeBureau (MLB)(MLB)BureauTel: ébec ForestForest IndustryIndustryQuébecCouncil (QFIC)(QFIC)CouncilTel: .qc.caWood PreservationPreservation CanadaCanadaWoodTel: awww.woodpreservation.caCanadianCanadian WoodWood CouncilCouncilTel:1-800-463-5091Tel: 1-800-463-5091Fax:Fax: 613-747-6264613-747-6264www.cwc.cawww.cwc.caThe Span Book2009 EditionA supplement to the SpanTables in the 2010 Edition of theNational Building Code of Canada

Facsimiles of grade stamps of Canadian WoodCouncil lumber grading agency membersThe Span Book is a supplement to the wood joist, rafterand beam spans found in the National Building Codeof Canada. Tables in the Span Book and the NationalBuilding Code were both generated by the CanadianWood Council. The National Building Code referencesthe Span Book as follows:“ Tables A-1 to A-16 cover only the most common configura tions. Especially in the area offloors, a wide variety of other configurationsis possible: glued subfloors, concrete toppings,machine stress rated lumber, etc. The CanadianWood Council publishes ‘The Span Book’,a compilation of span tables covering manyof these alternative configura tions. Althoughthese tables have not been subject to the formalcommittee review process, the Canadian WoodCouncil generates, for the CCBFC, all of theCode’s span tables for wood structural components; thus Code users can be confident thatthe alternative span tables in the ‘The SpanBook’ are consistent with the span tables inthe Code and with relevant Code requirements.”Alberta Forest Products Associationwww.albertaforestproducts.caConseil de l’industrie forestière duQuébec (Quebec Forest IndustryCouncil)www.cifq.qc.caKD-HTCouncil of Forest Industrieswww.cofi.orgOntario Forest Industries Association(Home of CLA Grading and Inspection)www.ofia.caMaritime Lumber Bureauwww.mlb.ca(From Clause A-9.23.4.2of the National Building Code of Canada)Published with permission of theNational Research Council of CanadaFor further information, including grade stamps for other grading agencies, refer to pages 32 to 35.

The Span Book2009 EditionSpan Tablesfor Canadian Dimension Lumberand Glued-Laminated Timber

While care has been taken to ensure that the information in thispublication conforms to appropriate standards and codes, and thebest current technology and practice, the Canadian Wood Councildoes not assume responsibility for errors or omissions in this publication, nor for specifications or work based on it.Printed in Canadaon Canadian paperISBN 978-0-9783213-3-8 Canadian Wood Council, 2009Published and distributed by:Canadian Wood Council99 Bank Street, Suite 400Ottawa, ONK1P 6B9General 3-747-6264Internetwww.cwc.ca

CONTENTS1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12. Energy and the Environment – CanadianWood Frame Construction . . . . . . . . . . . . . . . . . . . . . . . . . . 33. Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54. Minimum Code Requirements . . . . . . . . . . . . . . . . . . . . . . 115. Spans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186. Supported Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207. Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248. Other Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319. Grade Stamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32TABLESMetric UnitsJoists: Floor and Ceiling Joists (Tables 1-2) . 38Rafters: Roof Joists and Rafters (Tables 3-4) . 76Beams: Beams and Lintels (Tables 5-9) . . 104Imperial UnitsJoists: Floor and Ceiling Joists (Tables 1-2) . 178Rafters: Roof Joists and Rafters (Tables 3-4) . 216Beams: Beams and Lintels (Tables 5-9) . . 244i

LIST OF TABLESmetric imperialFloor Joists1.11.21.31.41.5Spruce – Pine – Fir . . . . . . . . . . . . . . . . .Douglas Fir – Larch . . . . . . . . . . . . . . . .Hem – Fir . . . . . . . . . . . . . . . . . . . . . . . . . .Northern Species . . . . . . . . . . . . . . . . . . .MSR Lumber . . . . . . . . . . . . . . . . . . . . . . .38. . . . .44. . . . .50. . . . .56. . . . .62. . . . .178184190196202Ceiling Joists2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74. . . . . 214Roof Joists3.13.23.33.43.53.63.7 iiRoof Snow Load – 1.0 kPa . . . . . . . . . .Roof Snow Load – 1.5 kPa . . . . . . . . . .Roof Snow Load – 2.0 kPa . . . . . . . . . .Roof Snow Load – 2.5 kPa . . . . . . . . . .Roof Snow Load – 3.0 kPa . . . . . . . . . .Roof Snow Load – 3.5 kPa . . . . . . . . . .Roof Snow Load – 4.0 kPa . . . . . . . . . .76. . . . .78. . . . .80. . . . .82. . . . .84. . . . .86. . . . .88. . . . .216218220222224226228(Page numbers for tables in Metric measurements are in yellow.Page numbers for tables in Imperial measurements are in blue.)

LIST OF TABLES (cont’d)metric imperialRoof Rafters4.14.24.34.44.54.64.7Roof Snow Load – 1.0 kPa . . . . . . . . . . 90. . . . .Roof Snow Load – 1.5 kPa . . . . . . . . . . 92. . . . .Roof Snow Load – 2.0 kPa . . . . . . . . . . 94. . . . .Roof Snow Load – 2.5 kPa . . . . . . . . . . 96. . . . .Roof Snow Load – 3.0 kPa . . . . . . . . . . 98. . . . .Roof Snow Load – 3.5 kPa . . . . . . . . . 100. . . . .Roof Snow Load – 4.0 kPa . . . . . . . . . 102. . . . .230232234236238240242Built-Up Floor Beams5.15.25.3Supporting One Floorin a House . . . . . . . . . . . . . . . . . . . . . . . . . 104. . . . . 244Supporting Two Floorsin a House . . . . . . . . . . . . . . . . . . . . . . . . . 108. . . . . 248Supporting Three Floorsin a House . . . . . . . . . . . . . . . . . . . . . . . . . 112. . . . . 252Glued-Laminated Floor Beams6.16.26.3 Supporting One Floorin a House . . . . . . . . . . . . . . . . . . . . . . . . . 118. . . . . 258Supporting Two Floorsin a House . . . . . . . . . . . . . . . . . . . . . . . . . 119. . . . . 259Supporting Three Floorsin a House . . . . . . . . . . . . . . . . . . . . . . . . . 120. . . . . 260(Page numbers for tables in Metric measurements are in yellow.Page numbers for tables in Imperial measurements are in blue.)iii

LIST OF TABLES (cont’d)metric imperialBuilt-Up Lintels Over LargeOpenings and Built-up Ridge Beams7.17.27.37.47.5Roof Snow Load – 1.0 kPa . . . . . . . . . 122. . . . .Roof Snow Load – 1.5 kPa . . . . . . . . . 126. . . . .Roof Snow Load – 2.0 kPa . . . . . . . . . 130. . . . .Roof Snow Load – 2.5 kPa . . . . . . . . . . 134. . . . .Roof Snow Load – 3.0 kPa . . . . . . . . . 138. . . . .262266270274278Glued-Laminated LintelsOver Large Openings8.1 Roof Snow Load 1.0 to 3.0 kPa . . . . 144. . . . . 2848.2 Suggested Bearing Lengths . . . . . . . . 150. . . . . 2902-Ply Lintels WithNon-Structural Sheathing9.19.29.39.49.59.6 ivSupporting Roof Only . . . . . . . . . . . . .Supporting Roof andOne Storey . . . . . . . . . . . . . . . . . . . . . . . .Supporting Roof andTwo Storeys . . . . . . . . . . . . . . . . . . . . . . .Supporting Roof andThree Storeys . . . . . . . . . . . . . . . . . . . . .End Walls Supporting RoofSnow Loads . . . . . . . . . . . . . . . . . . . . . . .Interior Walls . . . . . . . . . . . . . . . . . . . . .152. . . . . 292156. . . . . 296160. . . . . 300164. . . . . 304169. . . . . 309172. . . . . 312(Page numbers for tables in Metric measurements are in yellow.Page numbers for tables in Imperial measurements are in blue.)

The Span Book is a supplement to the wood joist, rafter and beam spans found in the National Building Code of Canada. Tables in the Span Book and the National Building Code were both generated by the Canadian Wood Council. The National Building Code references the Span Book as fol