clt in the u.s....disclaimer: this presentation was developed by a third party and isnot funded by...
TRANSCRIPT
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Disclaimer: This presentation was developed by a third party and isnot
funded by WoodWorks or the Softwood Lumber Board.
CLT in the U.S.Manufacturing and Applications
Presented by Quinn Guerrero
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“The Wood Products Council” is a
Registered Provider with The American
Institute of Architects Continuing
Education Systems (AIA/CES), Provider
#G516.
Credit(s) earned on completion of this
course will be reported to AIA CES for
AIA members. Certificates of
Completion for both AIA members and
non-AIA members are available upon
request.
This course is registered with 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 conclusionof thispresentation.
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Architects around the world are using mass timber construction systems to
build taller wood buildings, incorporate the aesthetic of exposed wood, or
increase the amount of prefabrication on their projects. Many usecross-
laminated timber (CLT) panels and glue-laminated timber (glulam) beamsas
the building structure, often as a carbon-friendly alternative toconventional
materials such as steel, masonry and concrete. In this presentation by an
Oregon-based CLT manufacturer, successful U.S. projects will be highlighted to
demonstrate the variety of commercial and multi-family applications available
for CLT under today’s building codes. Topics will also include CLT
manufacturing, benefits such as structural versatility, and potential future
uses.
Course Description
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1. Identify CLT manufacturing processes and consider how CLT can be usedunder
current building codes and standards.
2. Review completed CLT projects that demonstrate a range of applications andsystem
configurations.
3. Discuss benefits of using CLT, including structural versatility, prefabrication, lighter
carbon footprint, and reduced labor costs.
4. Highlight possibilities for the expanded use and application of CLT in larger and taller
buildings.
Learning Objectives
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Oregon Sawmill since 1951
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Riddle Laminators opened1967
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Mass Timber Benefits
Sustainable - reduced carbon footprint
- energy efficient
- renewable resource
- minimal waste
Performance - disaster resilient
- good fire resistance
- high performing acoustics
- structural flexibility
Construction
Efficiency- approx. 75% lighter than concrete
- reduced construction time
- pre-fabricated & precise
- small erection crews
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Mass Timber – HorizontalPanels
NLT
Im ages: Structurecraft
CLT GLT
composite LVLDLT
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CLT– Common Layups
9-ply 9-layer
3-ply 3-layer
5-ply 5-layer
7-ply 7-layer
7-ply 5-layer
9-ply 7-layer
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CLT
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CLT
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Engineered Timber – Frame
Im ages: Structurecraft
LVLGlulam PSL LSL
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Building Systems
Light FramePost & Beam Mass Timber
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CLT Possibilities– 2-way spanning roofs & floors
• Currently undergoing
shake table testing
Photo: Tom Harris
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CLT Possibilities – Shaft Walls
Photo: Alex Schreyer
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CLT Possibilities – Shearwalls
• Currently undergoing
shake table testing
• R-values not yet
published in codes
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CLT – Shearwalls
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CLT – Shearwalls & Floors
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CLT – holes ¬ches
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Early Involvement = success
• Design-Bid-Build Limitations
• Schedule is critical
• Early communication is key
Design Team + Fabricator + Installer
• Involve the fabricator early so wecan
help realize your design dreams
within budget and avoid value
engineering later
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CLT Prefabrication – CNC
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CLT Prefabrication – CNC
• MEP openings
• Window & dooropenings
• Notches
• Shop installed connectors
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Mass Timber– Steel Connectors
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CLT Prefabrication – Connections
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CLT Installation – Panel to beamconnections
Photo: Myticon
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Installation Training
• Invite new installers to the plant
• Truck loading &
erection sequencing
• Proper care during
installation and
before closure
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Delivering Success
• Early selection &
involvement of supplier
• Regular communication
• Trained Installation Crew
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CLT Cost Factors
• Thickness of panel/ number of laminations
• CNC time & complexity (for openings, penetrations,etc)
• Architectural finish or alternate grade/ species
• Shipping distance
• Special requirements
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Keep CLT Costs in Check
• Use minimum thickness possible
Floors usually controlled by vibration
Fire rating requirements can effect thickness
• Minimize material waste
Keep in mind press sizes available
Selection of splice type effects %waste
Openings can be accommodated without cutting holes inpanels
• Minimize factory CNC work
Consider field accommodation techniques for MEP
Openings can be accommodated without cutting holes inpanels
• Use fabricator’s standard product options including: species, grade & lay-up
• Always get the fabricator involved early in designprocess
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CLT in Building Codes – 2015 & 2018 IBC
Type I Type II Type III Type IV Type V
CLT Floors ✔ ✔ ✔
CLT Roofs ✔(1-hr or less FRR)
✔(1-hr or less FRR)
✔ ✔ ✔
CLT interior walls ✔ ✔ ✔
CLT exterior walls ✔ ✔
CLT permitted in various Types of Construction
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2021 IBC – Proposed Changes
Type of
Construction
Max
Height
#
Stories
Exposed
Mass
Timber
Primary
Frame FRR
Floor FRR Stair Tower Concealed
Spaces
IV-HT 85 ft 4-6 fully
exposed
HT
(2021)
HT Mass Timber Permitted
(2021)
IV-C 85 ft 4-9 fully
exposed
2 hr 2 hr Mass Timber Permitted
IV-B 180 ft 6-12 partially
exposed
2 hr 2 hr Mass Timber Permitted
IV-A 270 ft 9-18 fully
protected
3 hr 2 hr Noncombustible Permitted
Modernizing Type IV Heavy Timber for Tall Wood Buildings
Courtesy of: Am erican W ood Council
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Fire Protection
• Char layer provides
protection
• Class A Fire Spread
(highest rating)
• Building codes allow fire
resistance to be calculated
per the NDS
(NDS Tech Report 10)
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Fire Resistance Test – CLT StructuralFloor
• Exposed 5-ply CLT w/ 2” gypcrete topping – passed 2 hour test (ASTM E119)
• Up to 3-hour rating possible w/CLT
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Fire – Wood vs Steel
• @ 30 minutes, steel loses 90%strength
• Wood only loses 25%strength
Source:Aitc
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Locally Grown
• Support US Forest economy
• Revitalize rural communities
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• Wood buildings store carbon (50% of dry wood weight is carbon)
• Wood buildings currently store 5.4 billion tons ofcarbon
• Lighter, higher precision, and faster construction time compared toconcrete
• Sustainable forest management
Sustainability
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Owner: Sonoma Academy
Architect: WRNSStudio
Structural Engineer: Mar Structural
General Contractor: XL Construction
Timber Supplier: DRJohnson
CNC Routing: DR Johnson
Location: Santa Rosa,California
Sonoma AcademyJanet Durgin Guild & Commons
Photo: M ichael D avid Rose
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Sonoma Academy
Photo: M ichael D avid Rose
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Sonoma Academy
• Hybrid CLT & steel roof
• CLT exposed at exterior
• Curving edges of CLT
• Reclaimed wood beams
Credit: W RN S Studio
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Sonoma Academy – Roof
• CLT & steel hybrid
• Exposed CLT soffit
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Sonoma Academy – CLTinstall
• Laydown area
• Small crew
Photo: D R Johnson
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Sonoma Academy – CLTcurve
• Coordination between
design team, steel and
timber fabricators
• Tolerances
Photo: D R Johnson
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Sonoma Academy – CLT to steeldetail
Photo: D R Johnson
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Sonoma Academy
Photo: Celso Rojas
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Sonoma Academy
Photo: Jerem y Bitterm ann Photo: Celso Rojas
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Owner/ GC: Reworks
Architect: LEVERArchitecture
Structural Engineer: KPFF
Timber Supplier: DRJohnson
CNC Routing: DR Johnson (CLT)
CutMyTimber (Glulam)
Project Support: WoodWorks
Albina Yard
Photo: Lever Architecture
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Albina Yard – First in theU.S.
1st domestically sourced CLT building
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Albina Yard – First in theU.S.
1st CLT structural diaphragm
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Albina Yard – Mass Timber
• CLT panels
up to 10’ x 24’
• CLT cantilevers 4’
• Glue-laminated frame
Photo: Lever Architecture
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Albina Yard – CLTpanels
• 3-ply CLT
• Fastened with
long self-tapping screws
Photo: Lever Architecture
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Albina Yard
• Concealed connections
• Tight tolerances
Exploded Axonom etric: Lever Architecture
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Albina Yard – Digital Fabrication
• CNC routed
• Tight tolerances
Photo: Wood Works
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Albina Yard – Hundegger CNC
Photo: Lever Architecture
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Albina Yard – Concealed SteelConnectors
Photo: Lever ArchitecturePhoto: Lever Architecture
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Albina Yard – Hydraulic Press Bonding CLTlayers
Photo: Lever Architecture
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Albina Yard – DR Johnson’s CLTtruck
Photo: Lever Architecture
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Albina Yard – CLTerection
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Albina Yard – 16,000 sf Office
Photo: Lever ArchitecturePhoto: Lever Architecture
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Albina Yard – CLT Central Stair
Photo: Lever ArchitecturePhoto: Lever Architecture
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Early involvement of GC & fabricators
Efficient panel layout
Coordinating all MEP penetrations before fabrication
Accurate BIM model
Tolerances between trades
GC to pre-plan everything
Extremely fast construction
Albina Yard – Illuminating the path for more CLT in the U.S.
Photo: Lever Architecture
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• Mid-rise commercial and multi-unit housing
• Modular construction
• Military buildings
• Buildings beyond 20 stories
Mass Timber – Future Applications
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Blast After
Mass Timber – Blast Testing
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Tall Wood - International
Credit: Rethink W ood
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This concludes The American Institute
of Architects Continuing Education
Systems Course
QUESTIONS?
Quinn Guerrero
DR Johnson Wood Innovations