the case for cross laminated timber: part 1 q4 - the case for cl… · · 2015-11-24discuss the...

4/18/2014

1

Archie Landreman

262-497-5550

[email protected]

Questions?

Presented on [Date] by [Author’s Name]

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The Case for Cross Laminated Timber: Part 1

Opportunities and Challenges for a New Class of Timber Product

Presented by

Archie Landreman

Regional Director North Central

Wood Products Council is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.

This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. Registration no. 1

This Program is Registered with the AIA Learning Objectives

1. Review completed CLT projects that demonstrate a range of

applications and system configurations.

2. Discover how CLT can be used under current and future building

codes and standards.

3. Discuss benefits of using CLT in place of concrete and steel, including

structural versatility, prefabrication, lighter carbon footprint and

reduced labor costs.

4. Discuss the fire characteristics of CLT, including the benefits of

charring, current seismic approaches that can be used for CLT

buildings, and how the acoustic and moisture performance of CLT

assemblies can inform the design of a project.

Outline

• What is CLT?

• Definitions • The appeal • History • Availability

• Using CLT

• Project Examples • Best applications • Cost effective design • Building Codes and Standards

Outline

• What is CLT?

• Definitions • The Appeal • History • Availability

• Using CLT

• Project Examples • Best applications • Cost effective design • Building Codes and Standards

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New Class of Wood Products 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 heavy timber movement is motivated by…. • Demand for lower impact structures

• Manufacturing Technology

• Material Technology

• Advances in Pre-fabrication

• Sophisticated Suppliers

What is Cross Laminated Timber (CLT)?

• Layers of dimension lumber stacked crosswise and glued on their wide faces. Adhesives follow requirements of Glulam beams.

• Width and thickness of laminations vary (2.4-9.5” wide, 5/8 -2” thick)

• Lumber is ~12% MC prior to manufacture,

• 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.

• Finished panels are planed, sanded, cut to size. Then openings are cut with precise CNC routers.

• Third party inspection at factory.

• Custom engineered for material efficiency.

• Custom designed for project.

How to use CLT - Assembly

Source: NORDIC Cross Laminated Timber Connection Details

How to use CLT - Assembly How to use CLT – Single Span Floor

Source: Structurlam CLT guide

SAMPLE SPAN TABLES – CONTACT PANEL MANUFACTURER FOR ACTUAL SPANS

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What is the appeal of CLT?

• Embodied Carbon Sustainability

Performance

Construction Efficiency

Stadhaus, London, UK Architect: Waugh Thistleton Architects Photo credit: Waugh Thistleton Architects

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

Reduced Embodied Carbon

• Reduced Embodied Carbon • Minimal waste production

Sustainability

Performance


What is the appeal of CLT? Minimal Waste

Why are designers drawn to CLT?

• Reduced Embodied Carbon • Minimal waste production • Highly Energy Efficient

Sustainability

Performance


Energy Efficient

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Sustainability

• Disaster Resilient Performance


What is the appeal of CLT? Disaster Resilient Seismic R Under Alternate Means

• Reduced Embodied Carbon • Minimal waste production • Energy Efficient

Sustainability

• Disaster Resilient • Fire Resistant

Performance


What is the appeal of CLT? Fire Test Results

4.5 in

6.9 in

6.9 in

9.6 in


Sustainability

• Disaster Resilient • Good Fire Resistance • High performing Acoustics

Performance


What is the appeal of CLT? High Performing Acoustics

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Why are designers drawn to CLT?


Sustainability

• Disaster Resilient • Good Fire Resistance • High performing Acoustics • Structural Flexibility

Performance


Structural Flexibility


Sustainability


Performance

• ~75% lighter than concrete Construction

Efficiency

What is the appeal of CLT? 75% Lighter Weight Than Concrete


Sustainability


Performance

• ~75% lighter than concrete

• Reduced construction time


What is the appeal of CLT? Reduced Construction Time

Murray Grove, London UK

• 8 stories of CLT over 1 story concrete podium

• 8 stories built in 27

days (~1/2 the time of precast concrete)

Norwich Academy, Norwich UK

• 102,300 ft2 3 story

secondary school

• 17 weeks to construct

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Sustainability


Performance

• ~75% lighter than concrete • Reduced construction time • Pre-fabricated and Precise


What is the appeal of CLT? Pre-fabricated and Precise

CLT History Timeline

1990 2000 2005 2010 2015

Significantly increased use

in Europe

• 2010 – 1st Production

• 2011- PRG320 • 2011 -Canadian

Handbook • 2013 – US

Handbook interest began

.3 million m3 of built CLT

projects

Recognized in 2015 IBC

Austria industry-

academia joint research

.6-1 million m3 of built

CLT projects

Europe

North

Am

erica

Outline

• What is CLT?

• Mass Timber

• The Appeal

• History

• Availability

• Using CLT

• Project Examples

• Best applications

• Cost effective design

• Building Codes and Standards

UK

UK

Sweden

Italy

Germany

France

Australia

Tour of CLT Projects – The World

Stadhaus, London, UK Architect: Waugh Thistleton Architects Photo credit: Waugh Thistleton Architects

• Completed in 2009

• 8 stories of CLT over 1 concrete

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Frequently Asked Questions:

1. How are MEP Systems accommodated with CLT?.

• Rout and bore the panel to take the electrical conduit, plumbing pipes and mechanical chases. This can be done on site with traditional carpentry tools or in the factory using CNC technology, but the latter would require more coordination and would increase the cost of the product.

• Fur the wall out to accommodate MEP. This is likely to be the more common method in North America based on our building practices and need to satisfy sound insulation requirements.

• Type IV construction currently restrictions concealed spaces

Norwhich Open Academy, Norfolk England Design Team: Sheppard Robson, Romboll uK Photo credit: KLH


• 3 stories

• > 102K sqft

• 2700 tons of CO2 stored = 10 years of operational energy

• 17 weeks to construct

Limnologen, Vaxjo, Sweden Architect: Arkitekbolaget, Kronoberg, Martinsons


• 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

Schankula H8, Bad Aibling, Germany Architect: Arthur Schankula


• 8 stories

• 82 ft.

• ~12K sqft..

• 13 units

Paul Chevallier School, Lyon, France Architect: Techtoniques

• Elementary School

• Supported green roof

• CLT covered by wood cladding

• > 65K sqft

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Forte’, Victoria Harbor, Melbourne, Australia Architect: Lend Lease


• 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

Vancouver, BC

Elkford, BC

Alberta, ON

Chibougamau QU

Whitefish, MT

Fitchburg, WI

Sacramento, CA

Tour of CLT Projects – North America

UBC Bioenergy Research & Demo, Vancouver, BC, Canada Design Team:

Elkford Lodge, Elkford, BC, Canada Design Team: Douglas Sollow, Associated Engineering, AHC

• SIP and CLT System

• Exposed CLT

• Tallest wall is 23.5 ft.

Frequently Asked Questions:

1. How are MEP Systems accommodated with exposed CLT?.

• Fur out a wainscoting on the lower half of the wall • Run the conduit, pipes and chases on the face of the CLT and use it

as an exposed architectural element. • Add stick-framed partition walls on the interior of the structure • Create a drop ceiling to conceal

• Gap the CLT panels to accommodate plumbing and mechanical and add a thin faux panel on the face.

• Create a built-up floor on top of the CLT floor deck to

accommodate MEP

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Fort McMurry Airport, Alberta, Canada Architect: McFarlane + Biggar Architects

• Completed 2013

• Largest NA CLT Project

• 170K sqft

Multi-family, Chibougamau, Quebec, Canada Photo: Nordic Engineered Wood

• 1st NA multi-family CLT project

• 170K sqft

Long Hall, Whitefish, MT Designer: Darryl Byle, Jason Hatten

• 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 Promega GMP Facility, Fitchburg, WI Architect: Uihlein Wilson Architects


• 1st Commercial CLT Building in US built with North American CLT

• CLT used only in the roof

Capitol Lofts, Sacramento, CA Architect: Applied Architecture

• Currently under construction

• Used in loft floors

• Applications can start out small

Product Availability

• Two 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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How do you minimize product costs?

1. Use the minimum thickness possible 1. Floors are usually controlled by vibrations. 2. Fire rating requirements can effect thickness of panel.

2. Minimize material waste 1. Keep in mind press sizes available. 2. Selection of splice type effects % waste. 3. Openings can be accommodated with out cutting holes in panels.

3. Minimize factory CNC work 1. Consider field accommodation techniques for MEP 2. Openings can be accommodated with out cutting holes in panels.

4. Use the standard product options 1. Species 2. Finish 3. Lay-up

5. Choose the right application for CLT.

CLT as an alternate to Concrete/Masonry

Mid-rise Market Potential

CLT costs estimated $30-$35/sf in today’s market

Building Code -Product Standard

APA/ANSI PRG 320

• 7 stress classes

• Quality assurance testing

• Identification marking

Code Approvals – Product Reports Code Approvals – Product Reports

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US CLT Handbook

1. Introduction

2. Manufacturing

3. Structural

4. Lateral

5. Connections

6. DOL and Creep

7. Vibration

8. Fire

9. Sound

10.Enclosure

11. Environmental

12.Lifting

Building Code – Code Approvals

www.masstimber.com

Archie Landreman

262-497-5550

[email protected]

Questions?

http://www.masstimber.com

the case for cross laminated timber: part 1 q4 - the case for cl… · · 2015-11-24discuss the...

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