The Case for Cross Laminated Timber

The Case for
Cross Laminated
Timber
Opportunities and
Challenges for a New Class of
Timber Product
Presented
[Date]
by [Author’s
Presented
byon
Ethan
Martin,
PE Name]
(Edit the Master
Slide
to change this text)
Northwest
Regional
Director
WoodWorks for Non-residential Construction
What is Cross Laminated Timber (CLT)?
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Layers of dimension lumber stacked crosswise and glued on their
wide faces. Adhesives follow requirements of Glulam beams.
Width/thickness of laminations vary (2 1/2-9 1/2” wide, 5/8 -2” thick).
Lumber is ~12% MC prior to manufacture .
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Two way slab with odd number of layers identifying
primary strength direction.
Manufactured panels are typically 8-10’ wide and
up to 20” thick and up to 64’ long.
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Finished panels are planed, sanded,
cut to size. Then openings are cut
with precise CNC routers.
Third party inspection at factory.
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Custom engineered for
material efficiency.
Custom designed for
project.
Large Timber Structures
• Incorporating timber plate elements
• Including large timber elements such as solid sawn, LVL, LSL, glulam,
and CLT
• A structural system resisting both vertical and lateral loads
The new mass timber movement is motivated by….
• Demand for lower impact structures
• Manufacturing Technology
• Material Technology
• Advances in Pre-fabrication
• Sophisticated Suppliers
New Class of Wood Products
How to use CLT - Assembly
How to use CLT – Single Span Floor
SAMPLE SPAN TABLES – CONTACT PANEL MANUFACTURER FOR ACTUAL SPANS
Source: Structurlam CLT guide
What is the appeal of CLT?
Sustainability
Performance
Construction
Efficiency
• Reduced Embodied Carbon
• Minimal waste production
Reduced Embodied Carbon
Volume of wood used
950 m3
Carbon sequestered and
stored (CO2e)
760 metric tons
Avoided greenhouse
gases (CO2e)
320 metric tons
Total potential carbon
benefit (CO2e)
1,080 metric tons
Carbon savings from the choice of wood in
this one building are equivalent to:
1,615 passenger vehicles off the
road for a year
Enough energy to operate a
home for 803 years
Stadhaus, London, UK
Architect: Waugh Thistleton Architects
Photo credit: Waugh Thistleton Architects
Minimal Waste
What is the appeal of CLT?
Sustainability
• Reduced Embodied Carbon
• Minimal waste production
• Energy Efficient
Performance
• Disaster Resilient
• Fire Resistant
Construction
Efficiency
Fire Test Results
4.5 in
6.9 in
6.9 in
9.6 in
Structural Flexibility
What is the appeal of CLT?
Sustainability
• Reduced Embodied Carbon
• Minimal waste production
• Highly Energy Efficient
Performance
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Construction
Efficiency
• ~75% lighter than concrete
• Reduced construction time
Disaster Resilient
Good Fire Resistance
High performing Acoustics
Structural Flexibility
75% Lighter Weight Than Concrete
Reduced Construction Time
Murray Grove,
London UK
8 stories of CLT over 1
story concrete podium
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8 stories built in 27
days (~1/2 the time of
precast concrete)
Norwich Academy,
Norwich UK
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102,300 ft2 3 story
secondary school
17 weeks to construct
Tour of CLT Projects – The World
UK
Sweden
UK
Germany
Italy
Australia
France
• Completed in 2009
• 8 stories of CLT over 1
concrete
Stadhaus, London, UK
Architect: Waugh Thistleton Architects
Photo credit: Waugh Thistleton Architects
Completed in 2010
3 stories
> 102K sqft
2700 tons of CO2
stored = 10 years of
operational energy
• 17 weeks to construct
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Norwich Open Academy, Norfolk England
Design Team: Sheppard Robson, Romboll uK
Photo credit: KLH
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Limnologen, Vaxjo, Sweden
Architect: Arkitekbolaget, Kronoberg, Martinsons
Completed in 2008
4 buildings
8 stories
78 ft. tall
> 115K sqft..
134 units
Aqualux Hotel, Bardolino, Italy
Architect: Rama Architettura
• 180K sqft
• Luxury Hotel
• Construction time
was 3 mo. vs. 2 yr.
w/ concrete
• Wall system was
2” thinner with
CLT
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Schankula H8, Bad Aibling, Germany
Architect: Arthur Schankula
Completed in 2011
8 stories
82 ft.
~12K sqft..
13 units
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Forte’, Victoria Harbor, Melbourne, Australia
Architect: Lend Lease
Completed in 2012
10 stories
~ 105 ft. tall, > 18.6 K sqft.
3 million in R&D
Poor soils required a much
lighter building
Forte’, Victoria Harbor, Melbourne, Australia
Architect: Lend Lease
Tour of CLT Projects – North America
Vancouver, BC
Alberta, ON
Elkford, BC
Sacramento,
CA
Whitefish, MT
Chibougamau
QU
Fitchburg, WI
UBC Bioenergy Research & Demo, Vancouver, BC, Canada
Design Team:
• SIP and CLT System
• Exposed CLT
• Tallest wall is 23.5 ft.
Elkford Lodge, Elkford, BC, Canada
Design Team: Douglas Sollow, Associated Engineering, AHC
Fort McMurry Airport, Alberta, Canada
Architect: McFarlane + Biggar Architects
• Completed 2013
• Largest NA CLT Project
• 170K sqft
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1st Commercial CLT “Building” in US
$145/sqft completed project cost
Structural shell complete in < 5 days
Saved 30% in foundation costs
Saved 6-12% over CMU
Long Hall, Whitefish, MT
Designer: Darryl Byle, Jason Hatten
• Completed in 2013
• 1st Commercial CLT Building in US
built with North American CLT
• CLT used only in the roof
Promega GMP Facility, Fitchburg, WI
Architect: Uihlein Wilson Architects
Product Availability
• Three North American producers of structural CLT
• ~425,000 ft3 of annual production capacity (structural CLT)
• 2-3 US Companies pursuing manufacturing facilities
• Non-commodity based product
• Standardized manufacture but custom fabrication
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Building Code -Product Standard
APA/ANSI PRG 320
• 7 stress classes
• Quality assurance testing
• Identification marking
US CLT Handbook
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Introduction
Manufacturing
Structural
Lateral
Connections
DOL and Creep
Vibration
Fire
9. Sound
10.Enclosure
11. Environmental
12.Lifting
Questions?
Ethan Martin, PE
WoodWorks
[email protected]
toll free 855.USE.WOOD (873.9663)
cell 206.678.2086