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c. Cross-Laminated Timber:

Revolutionizing Wood Use in Construction

David Moses, PrincipalPhD, PEng, PE, LEED® AP

Moses Structural Engineers Inc.

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Precision Wood Machining

Structurlam Products Ltd., Penticton, BC

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Cross-laminated Timber (CLT)

• Solid wood panel

• Now available in Canada

• Many applications

• Better strength

• Better fire resistance

• Dimensionally stable

Source: FPInnovationsOcto

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Source: “Tackle Climate Change”

Carbon SequestrationO

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Courtesy: KLH & Waugh Thistleton ArchitectsOcto

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Vancouver 2010 OylmpicsWhistler, BC

• Austria House – 1st use of CLT

• All prefabricated and site installed

• 1st Canadian Passive house

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Austria HouseO

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Austria HouseO

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Austria HouseO

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R&D and REVIT modelsO

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Austria HouseO

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Murray Grove BuildingLondon, England

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Courtesy: Waugh Thistleton ArchitectsO

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Courtesy: Waugh Thistleton ArchitectsOcto

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Courtesy: Waugh ThistletonArchitectsO

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Canadian Suppliers

• Structurlam Products Ltd.

• Nordic Wood Structures

• CST Innovations

• KLH Element

Let’s look at examples from West to East

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Structurlam Products Ltd.

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Dowling Residence, BCDGBK Architects, Equilibrium Consulting

• 3-4 storey

• 4700 sq.ft.

• 1st Canadian CLT structure on concrete base

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From: BC WoodWorks! case studyOcto

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From: BC WoodWorks! case studyOcto

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Elkford Lake Community Centre, BCDouglas Sollows Architects

Associated Engineering

• 18,000 sq.ft.

• Max panels 10’x40’ x 12” thick

• CLT : Structurlam Products Ltd.

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Source: District of Elkford website

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Courtesy: Structurlam Products Ltd.

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VideoElkford Lake Community Centre, BC

http://www.youtube.com/ahc1893

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UBC Earth Sciences Building, BCArchitect: Busby Perkins + Will

Structural Engineer: Equilibrium Consulting Inc.

• 5 storeys

• Group A, Div.2 assembly occupancy

• Peer review & code equivalency

• CLT & glulam : Structurlam Products Ltd.

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Courtesy: Structurlam Products Ltd.

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Courtesy: Structurlam Products Ltd.

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Courtesy: Structurlam Products Ltd.

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Courtesy: Structurlam Products Ltd.

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UBC Bioenergy R&D, BCMcFarland Marceau Architects Ltd.

Structural Engineer: Equilibrium Consulting Inc.

• 20,000 sq.ft.

• Biogas steam plant for UBC campus

• CLT walls and roof deck on glulam rigid frame

on concrete base

• CLT : CST Ltd.

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From: BC WoodWorks! case study,McFarland Marceau Architects rendering

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Courtesy: McFarland Marceau Arch + Equilibrium

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Community Centre, St.Prime, Quebec

• 1st CLT project in Quebec – June 2011

• Modern post and beam

• CLT panels 55’ long, 4” thick

• Supplier: Nordic Wood Structures

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Courtesy: Nordic Wood StructuresOcto

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Courtesy: Nordic Wood Structures

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Courtesy: Nordic Wood StructuresOcto

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Courtesy: Nordic Wood StructuresOcto

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Durocher College Atrium

• Built August 2011

• 36’ long panels

• Note the screws

• Supplier: Nordic Wood Structures

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Courtesy: Nordic Wood StructuresOcto

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Courtesy: Nordic Wood StructuresOcto

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Courtesy: Nordic Wood StructuresOcto

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Other current projects - Quebec

• Labaie Arena – 125’ hybrid CLT trusses

• Desbiens Retirement Home – 3-storey Oct. 2011

• Chibougamau Condos – 4-storey Fall 2011

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Cross-laminated Timber (CLT)

Introductory Article (pdf) at:

www.mosesstructures.com

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www.FPInnovations.ca

And Plant Qualification Standard

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Rules of Thumb

• CLT design has the ‘feel’ of concrete

• Floor span-to-depth ratios 20-30

• Roof span-to-depth ratios 30-40

• Deflection and vibration control design(not strength)

• Engineers must consider creep and rolling shear

• Effective stiffness increases for longer spans

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Preliminary sizing charts

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Source: Stora Enso website, Austria

Building in LondonOcto

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