Mass Timber: Knowing Your Options
Transcript of Mass Timber: Knowing Your Options
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| Vancouver Edmonton Frankfurt
Mass Timber:
Knowing Your OptionsPresentation to the Architectural Institute of BC
& the American Institute of Architects
24 October, 2013
Ian BoyleP.Eng., Struct.Eng., P.E., S.E.
Bernhard GafnerP.Eng., MIStructE, C.Eng., Dipl.Ing. FH/STV
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Fresh Thinking | Holistic Design
| Vancouver Edmonton Frankfurt
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Outline |
• Overview
• Future
• Design process + case studies
• Useful tools
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Overview |
• Definition of Mass Timber
• Structural Building Systems
• Products
• Sizes and Design Characteristics
• Comparison
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Mass timber construction uses large and
ideally prefabricated wood for wall, floor,
and roof construction. […] Because of
their high strength and dimensional
stability, they can be used as alternatives
to concrete, masonry and steel in many
building types.
Quote from MassTimber.com
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Overview | Building Systems
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Building Systems |
Light Wood Frame (Stick Frame)
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Post + Beam (with Mass Timber or light wood frame floors)
Building Systems |
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Mass Timber (100%)
Building Systems |
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Light Wood Frame Post + Beam Mass Timber (100%)
Institutional Residential
Mass Timber Floors
(and Shearwalls)
Mass Timber Walls and
Floors
Building Systems |
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Institutional Residential
Mass Timber Floors
(and Shearwalls)
Mass Timber Walls and
Floors
Light Wood Frame Post + Beam Mass Timber (100%)
Building Systems |
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Overview | Products
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Overview | NLT
Nail Laminated Timber
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NLT |
Alternative
Names: nailed timber, nail-up, edge-lam, brettstapel
System: regular framing members (2x, 3x) on edge +
fastened together
Suppliers: a good carpenter
Basic Info: - material/fibre used: S-P-F / Douglas Fir or any
other
- harvesting cycle: 80 years
- floor, roof (and wall) with Plywood sheathing for
lateral loads
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NLT |
Comments:
Non-standardized panel product
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NLT |
Comments:
Non-standardized panel product
- base material covered with grading rules
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Courtesy of Nicola Log Works
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Courtesy of Nicola Log Works
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NLT |
Comments:
Non-standardized panel product
Specifications
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NLT |
Comments:
Non-standardized panel product
Specifications
Requires care with regards to swelling /
shrinkage perpendicular to grain
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NLT |
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NLT | Samuel Brighouse Elementary
Perkins + Will Canada
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NLT | SFU UniverCity Childcare
Hughes Condon Marler Architects
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Overview | Products
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Overview | GLT
Glue Laminated Timber
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GLT |
Alternative
Names: glued edge laminated timber,
edge laminated timber, edge-lam
System: “glulam beams on edge”
Suppliers: Structurlam (Penticton), Western Archrib
(Edmonton), Nordic (Montreal) or any other glulam
supplier
Basic Info: - material/fibre: S-P-F / D. Fir / Black Spruce / …
- harvesting cycle: 80 years
- adhesive: Phenol Resorcinol (black) or
Melamine (clear)
- adhesive amount: 1% by weight
- floor, roof (and wall) with Plywood sheathing for
lateral loads
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GLT |
Comments:
Standardized product
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GLT |
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GLT |
Comments:
Standardized product
Requires care with regards to swelling /
shrinkage perpendicular to grain
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GLT |
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GLT |
Comments:
Standardized product
Requires care with regards to swelling /
shrinkage perpendicular to grain
Glulam beam ≠ GLT
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GLT |
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GLT |
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GLT | Slave Lake Government Centre
Manasc Isaac Architects
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GLT | Kin Centre Arena Complex
PBK Architects
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Overview | Products
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Overview | CLT
Cross Laminated Timber
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CLT |
Alternative
Names: cross laminated timber, x-lam
System: cross laminated timber panels 2x
members glued together
Suppliers: Structurlam (Penticton, BC), Nordic
(Montreal, QC), Smartlam (Whitefish, MT)
Basic Info: - material/fibre: S-P-F / Black Spruce
- harvesting cycle: 80 to 100 years
- adhesive: Polyurethane
- adhesive amount: 4% by weight
- floor, roof and wall with joints detailed for
lateral loads
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CLT |
Comments:
Standardized product
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CLT |
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CLT |
Comments:
Standardized product
Dimensionally very stable
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CLT |
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CLT |
Comments:
Standardized product
Dimensionally very stable
Two directional span capabilities
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CLT |
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CLT | Wayne Gretzky Centre
Courtesy of Structurlam Products
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Courtesy of Structurlam Products
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CLT | District 03
Courtesy of Nordic
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Courtesy of Nordic
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Overview | Products
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Overview | Solid LSL
Laminated Strand Lumber
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Solid LSL |
Alternative
Names: n/a
System: laminated strand lumber (timber strands
glued together)
Suppliers: *Weyerhauser, Louisiana Pacific,
Basic Info*: - material/fibre: Aspen
- harvesting cycle: 60 to 70 years
- adhesive: MDI - Isocyante
- adhesive amount: 6% by weight
- floor, roof and wall with joints detailed for
lateral loads (limited thicknesses!)
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Solid LSL |
Comments:
Standardized product
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Solid LSL |
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Solid LSL |
Comments:
Standardized product
Dimensionally relatively stable
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Solid LSL |
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Solid LSL | Gilmore SkyTrain Station
Perkins + Will Canada
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Solid LSL | False Creek Community Centre
Henriquez + Partners Architects
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Overview | Products
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Overview | Solid LVL
Laminated Veneer Lumber
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Solid LVL |
Alternative
Names: Microlam, Versalam
System: laminated veneer lumber (veneers stacked & glued
together)
Suppliers: Louisianan Pacific*, Weyerhaeuser, Boise
Cascade, West Fraser, Metsawood
Basic Info*: - material/fibre: D. Fir
- harvesting cycle: 80 years
- adhesive: Phenol Formaldehyde
- adhesive amount: 7% by weight
- floor, roof and wall with joints detailed for
lateral loads (limited thicknesses!)
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Solid LVL |
Comments:
Standardized product
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Solid LVL |
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Solid LVL |
Comments:
Standardized product
Dimensionally relatively stable (can add
cross layers)
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Solid LVL |
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Solid LVL |
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Solid LVL |
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Overview | Products
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Overview | Brisco Fine Line LVL
Laminated Veneer Lumber
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Brisco Fine Line LVL |
Alternative
Names: N/A
System: laminated veneer lumber (veneers stacked &
glued together)
Suppliers: Brisco
Basic Info: - material/fibre: D. Fir
- harvesting cycle: 80 years
- adhesive: Phenol Formaldehyde
- adhesive amount: 7% by weight
- floor, roof and wall with joints detailed for
lateral loads
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Brisco Fine Line LVL |
Comments:
Standardized product
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Brisco Fine Line LVL |
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Brisco Fine Line LVL |
Comments:
Standardized product
Dimensionally relatively stable
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Brisco Fine Line LVL |
Courtesy of Brisco
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Courtesy of Brisco
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Courtesy of Brisco
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Courtesy of Brisco
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Overview | Products
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Overview | WCC
Wood – Concrete - Composite
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WCC |
Alternative
Names: Timber – Concrete – Composite
System: Solid wood panel at bottom, concrete over
top (acting as one unit)
Base layer can be nearly any solid wood
panel
Connector supplied by wood panel supplier
or general contractor
“Free”, stiff and strong diaphragm
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Overview | OTHERS
PSL (Parallam)
Solid Decking / T&G
Logs
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Sizes and Design Characteristics |
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Sizes and Design Characteristics | Depth
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Sizes and Design Characteristics | Width
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Sizes and Design Characteristics | Length
16m (50’) to 20m (66’) basic transportation length
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Comparison |
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Design is mostly governed by
deflection (stiffness) and / or vibration
Comparison | Stiffness
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Stiffness |
DARK COLOR = DEPTH
LIGHT COLOR = RELATIVE STIFFNESS
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Comparison | Fire
In general, all products have a similar char rate
Approximately 38mm – 44mm / 60 minutes
- Check with Code Consultant
Be careful with CLT if required rating is between
45 and 90 minutes
- Most of the time it’s not a problem for panels
with 5+ layers
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Fire |
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Fire |
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Fire |
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Practical Considerations |
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Practical Considerations | Location
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Location |
Local trades
Distance to suppliers (LEED, Living Building
Challenge)
Dry vs. wet climate
Funding
Season of construction (winter prefab)
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Practical Considerations | Size of a Project
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Size of Project |
Sole Sourcing / Suppliers capacity
Sequencing on Site / Staging
Procurement
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Practical Considerations | Procurement
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Procurement |
Design - Bid - Build
Construction Management
Design Build
?
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Depth |
5m FLOOR SPAN 160mm – 200mm
DEPTHS ACCOUNT FOR VIBRATION
6m FLOOR SPAN 220mm – 260mm
4m FLOOR SPAN 110mm – 150mm
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Practical Considerations | Decide Early
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Use the product to its fullest extent possible
Work with supplier
Economical solution
Decide Early |
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Practical Considerations | BIM
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BIM |
CNC fabrication requires 3-D files
Architectural 3-D models (REVIT) are not compatible
with fabrication models
3-D shop drawing model including connections
Successful projects using prefabricated systems rely
heavily on integrated design (including fabricator &
installer) and 3-D computer models to detect
potential conflicts and fabrication/installation issues
early in the process
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Practical Considerations | Movement
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Practical Considerations | Movement
NLT, GLT:
0.25% change in dimension for each 1% change
in moisture content
• 12%MC when installed
• 14%MC during construction
• 50mm swelling in 10m
*38mm each 6m (1 ½” each 20’)
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Practical Considerations | Connections
Wall
FloorWall
Foundation
Wall
Wall
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Practical Considerations | Connections
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Galvanized or otherwise protected steel parts and
fasteners to deal with moisture:
Practical Considerations | Connections
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Mass Timber Design Process|
• Case studies as a means to introduce concepts,
uses and challenges:
Case 1: Athabasca University Academic Research Ctr.
Case 2: Mountain Equipment Co-op Head Office
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Case Study One | Athabasca University
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Design |
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Nail Laminated |
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Standard & locally available
Prefabrication
Aesthetics
Low-skilled labour
Integrates mechanical & electrical systems
Nail Laminated |
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Tender & Construction |
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Case Study Two | Mountain Equipment Co-op
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Design |
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NLT
CLT
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Tender |
• 2x8 solid wood NLT panels
• 2x10 panels at snow drift
zones and green roof
• Random stack pattern for
long span
• ½” plywood and topping
• One hour fire rating
(including char reduction)
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Construction |
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The Future of Mass Timber |
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The Future | Innovative Products + Applications
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The Future | Innovative Products + Applications
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DESIGN DEVELOPMENT CONTRACT DOCUMENTS TENDER + CONSTRUCITON
The Future | Procurement
TRADITIONAL
DESIGN ASSIST
FABRICATION
DESIGN
DESIGN
SHOP DRAWINGS
TIME SAVINGS
PRE-TENDER
FABRICATIONSHOP DRAWINGS
INSTALLATION
INSTALLATION
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The Future | Tall(er) Wood Buildings
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CONCEPT App |
Idea calculator for architects
Member calculator
Material gallery
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CONCEPT App | Depth Calculator
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CONCEPT App | Depth Calculator Results
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CONCEPT App | Material Gallery
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CONCEPT App | Material Gallery
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CONCEPT App |
Available on iTunes or visit
www.fastepp.com for more
information
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