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Copyright Materials

This presentation is protected by US and International

Copyright laws. Reproduction, distribution, display and

use of the presentation without written permission of the

speaker is prohibited.

© Boise Cascade 2013

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Canadian Wood Council, Wood WORKS! and the Wood Solutions Fair is a Registered Provider with The American Institute of Architects Continuing Education System; the Architectural Institute of British Columbia and the

Engineering Institute of Canada. Credit earned on completion of this program will be reported on behalf of members of each CES provider for those who complete

a participation form at the registration counter. Certificates of Completion for non-AIA, AIBC or EIC 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.

Program Education Credit Information

• Prefabricated Wood I-Joists

• BCI®, TJI®, LPI®

• Structural Composite Lumber (SCL)

• Laminated Veneer Lumber (LVL)

• VERSA-LAM®, Microllam®

• Parallel Strand Lumber (PSL)

• Laminated Strand Lumber (LSL)

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Other EWP Products

•Plywood

•Glue Laminated Timber (Glulam)

•Metal-Plate Wood Trusses

•Oriented Strand Board (OSB)

•Cross Laminated Timber (CLT)

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Knots and other defects

reduce resistance

Defects dispersed in EWP

Higher strengths obtained

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• Higher Specified Strengths

• Dimensional Stability

• Manufactured at low moisture content (6-8%)

• No shrinkage in the field if product kept dry

• Slight swelling to equilibrium

• Orthotropic material

• Shrink/swell ratios: Tangential, Radial, Longitudinal: 20-10-1

• Floor joist depth

• MC <= 12% for floor joists in mid-rise lower floors

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Recommended installation to account for lumber shrinkage

Not required for wood I-joists –shrinkage is typically not an issue

FPInnovations/CWC: Vertical Movement in Wood Platform Frame Structures

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Multiple Series & Depths for Various Applications within Residential / High Density / Light Commercial Construction

Proprietary Factored Resistance Values

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• Each manufacturer tests to establish equivalency to lumber joists

• Original APA testing of lumber joists (1950’s) – Current wood horizontal diaphragm tables in CWC Wood Design Manual and IBC

• Wood I-joist testing per ICC Acceptance Criteria (Full and small scale testing)

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Failure of

sheathing

Flange

thickness not

limiting factor

• Consult manufacturer for diaphragm values and limits

• Typical closest allowable nail spacing = 4”

Case 1 Diaphragm: Staggered Sheathing Perpendicular to Joist

Length

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• Staggered nailing at panel edges

Concentrated loads shall not bear directly on I-joists

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• Typical Rimboard Thickness

• 1 1/8” – 1 1/4” OSB

• 1 1/4” – 3 1/2” LVL / LSL

• Vertical load and lateral nail resistance for diaphragms

• Dimension lumber should never be used as rim board with wood I-Joists

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Proprietary Factored Resistance Values

• Closest allowable nail spacing

controls lateral design• Thicker rim = tighter allowable

spacing

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Options for increased lateral load transfer

• Uniform vertical load

resistance (typically 2500 lb/ft)

• Squash blocks

required under columns

• Wider flanges allow for additional nail

rows

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Laminated Veneer Lumber (LVL)

• Widths: 1 ¾”, 3 ½”, 5 ¼”, 7”

• Depths: Up to 24”

• Different grades possible depending upon mix of veneer

• High Specified Strengths• COV 10-15%

• 4800 – 6270 psi Bending, 1.7 – 2.0 x 106 psi MOE

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•Parallel Strand Lumber (PSL)

• Long strips of veneer glued together

• Developed in B.C. 70’s – early 80’s

•Laminated Strand Lumber (LSL)

• 12” long strands

•Oriented Strand Lumber (OSL)

• 3” – 6” long strands

SCL: Specified Strengths & MOEProduct Bending Shear MOE

Doug Fir

SS Grade

2830 220 1.7 x 106

24F-E DF

Glulam

4435 290 1.9 x 106

LSL 4300 575 1.3 – 1.6 x 106

PSL 5360 540 2.0 - 2.2 x 106

LVL 4800 -6280

530 – 580 1.7 – 2.0 x 106

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• Multiple 1 3/4” ply

beams must be connected properly

for load to be

distributed evenly

• Higher grade SCL

typically equivalent to DF in specific

gravity

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Wall Height

Blocking

Blocking

Top of Floor

• US Test Criteria: AC

202 (ICC-ES)

• Minimum nail spacing

requirements to ensure ductile failure

• EWP industry has

funded a test program

with cyclic testing at FPInnovations via

CCMC

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•Flame Spread

• Surface flammability

• Typically for exposed framing

•Fire Endurance• System resistance for assemblies

• Product char rate

• CAN/ULC S-101 Fire Tests (ASTM E119)

• Higher severity of fire exposure

Flame Spread Test – Steiner Tunnel

Fire Endurance –ULC S-101 ASTM E119

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• Floor/ceiling assembly based on CAN/ULC S-101 / ASTM E-119 fire test (45 min, 1 & 2

hour)

• Most common 1 hour assembly requires two

layers of fire-rated gypsum board

• Single gypsum layer assemblies require

additional fire resistance (mineral wool insulation, etc.)

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Time – Temperature Curve

• 5:00: 550 ○C

• 10:00: 700 ○C

• 15:00: 760 ○C

• 30:00: 820 ○C

• 60:00: 930 ○C

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• Certification defined in NBCC

• Assemblies listed by agency accredited by Standards Council of Canada (SCC)

• Example agencies:

• ULC®

• InterTek®

• APA – The Engineered Wood Association®

• PFS® Corporation

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Noise from footsteps

Noise from footsteps

Noise from televisions

and voices

Noise from televisions

and voicesNoise from stereos

Noise from stereos

Noise from phones

Noise from phones

• Sound Transmission Class (STC)

• Impact Insulation Class (IIC)

• Important Components

• Floor Covering

• Resilient Channels

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• SCL has the same char rate as timber & glulam

• Methodology prescribed in NBCC 2010 D-2.11.1 can

be applied to SCL

• Simple design procedure based on NRC research,

calculate endurance time of a wood member exposed

to standard fire based upon:

• the size of wood beam or column

• percent of maximum allowable design load

applied.

• More information – American Wood Council: TR10

• ASTM - American Society For Testing and

Materials, recognized in NBCC as non-Canadian accepted standard organization

• Members include industry, manufacturing, designers,

scientists, code officials.

• Provides qualification requirements

• Mandates independent third-party inspection, in-house

quality assurance, periodic re-evaluation.

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• Evaluation Services evaluate product based on testing standards provided by ASTM

• Canada: CCMC

• US: International Code Council (ICC)

• Allows proprietary product as an alternate in the code

Destructive

• Web stock

• Flange tension

• Full joist reaction

Non-Destructive

• Veneer stress wave grading

• Flange proof load

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I-Joist “Reaction”

20+ possible shear/reaction failure modes

Factored resistance determined empirically

Tension testing of glulam

lamination stock

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In grade, full scale

Glulam testing

Sizing Software

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• Manufacturers have product engineering support

staff to consult

• Product Technical Notes available from

manufacturers and testing agencies

• Product Warranties

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• Consult manufacturer for repairs

• Testing conducted to verify repairs for common field conditions

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Testing of common

field issues & repairs

• BC WoodWorks: http://www.wood-works.org/bc

• Canadian Wood Council: www.cwc.ca

• Wood I-Joist Manufactures Association (WIJMA): www.i-joist.org

• American Wood Council: www.awc.org

• APA – Engineered Wood Association: www.apawood.org

• US Forest Products Laboratory: www.fpl.fs.fed.us

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This concludes the:

• American Institute of Architects

•Architectural Institute of British Columbia

• Engineering Institute of Canada

Continuing Education Systems Program

Engineered Wood Products:

Current Design Topics

Jeff Olson, P.E., P.Eng.jeffolson@bc.com

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Questions/ Comments?