BASIC FACTS OF

RESIDENTIAL ENGINEERED LUMBER

AIA Course BLS100

1 LU + 1 HSW

AIA COURSE BLS100

Weyerhaeuser is a Registered Provider with

The American Institute of Architects Continuing Education Systems (AIA/CES).

Credit(s) earned on completion of this program 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 program 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 conclusion of this presentation.

Thank you!

LEARNING OBJECTIVES

Recognize the advantages of specifying engineered lumber.

Identify common engineered lumber types, including: product composition typical sizes design properties

Recognize the common applications for engineered lumber products.

Know what to watch out for: special requirements that apply to Engineered Lumber Products.

WHY SPECIFY ENGINEERED LUMBER?

More efficient use of wood fiber, availability, & building trends

Predictable design values

Dimensionally stable

Allows for larger holes to accommodate mechanicals within joist cavities

COMMON ENGINEERED LUMBER PRODUCTS

Parallel Strand Lumber

Laminated Strand Lumber

Laminated Veneer Lumber

Wooden I-Joists

PARALLEL STRAND LUMBER (PSL)

PSL APPLICATIONS

HEADERS AND BEAMS EXTERIOR DECK

POSTS AND BEAMS

HIGH MOISTURE ENVIRONMENTS

EXPOSED BEAMS AND

COLUMNS

PSL SIZES – BEAMS AND HEADERS

D

W

* CAUTION! Treated products vary in size and availability by market and manufacturer. Confirm availability before specifying!

Widths2 11⁄16”3 1⁄2”5 1⁄4” 7"

Depths9 1⁄4”9 1⁄2”11 1⁄4”11 7⁄8”14”16”18”

PSL SIZES – POSTS AND COLUMNS

3 1⁄2” x 3 1⁄2”

3 1⁄2” x 5 1⁄4”

3 1⁄2” x 7”5 1⁄4” x 5

1⁄4”5 1⁄4” x 7”7” x 7”

W1

W2

Column Sizes

PSL ADVANTAGES

LARGE LOADS

- Supports heavier loads than comparably sized conventional Glulam or solid-sawn lumber

EXPOSED

LONG SPANS - Supports long spans for open floor plans

- Exposed PSL beams add aesthetic value

CANTILEVERS/ MULTI-SPAN

- Excellent for cantilever & multi-span applications

EXTERIOR - Can be treated for exterior uses (regional)

LAMINATED VENEER LUMBER (LVL)

LVL APPLICATIONS

BEAMS

HEADERS

LVL SIZES

Depths: 5 ½”7 ¼”9 ½”11 7/8 ”

14”16” 18”

Width: 1 ¾” (common to use multi-ply members)

LVL ADVANTAGES

MULTI-PLY APPLICATIONS

PREDICTABLE PERFORMANCE

STRAIGHT/TRUE

- Up to 4 members can be site-connected

- No significant effect from lumber defects

- No bowing, shrinking, or twisting

STRENGTH/WEIGHT

- Supports heavier loads than comparably sized conventional lumber

LAMINATED STRAND LUMBER (LSL)

LSL APPLICATIONS

HEADERS

BEAMS

WALL FRAMING

RIM BOARDCOLUMNS STAIR STRINGERS

ROOF JOISTS

LSL SIZES

Widths 1 ¾” 3 ½”

Depths 43⁄8” 51⁄2” 71⁄4” 85⁄8” 9 1⁄4”

HEADERS AND

BEAMS

RIM BOARD

9 1⁄2” 11

½” 14” 16”

Depths

STUDS

Sections 2x4 2x6 1¾” x

5½” 2x8 1¾” x

7¼”Lengths

2x4 – 14’ 2x6 – 22’ 2x8 – 30’

9 1⁄2” 11 1⁄4” 11 7⁄8” 14” 16”

Widths 1 ¼” 1 1/8” *

* The lateral load transfer capacity of thinner rim boards is not equivalent to 2" nominal framing and is limited by code to 180 plf.

LSL ADVANTAGES - WALLS

CONSISTENT /UNIFORM

- No shimming on headers or studs; eliminates culls

TALL WALLS

- Dimensional stability results in solid, straight walls

- Eliminates the “hinge” point in tall walls

STRAIGHT/TRUE

STRENGTH (SHORT SPANS)

- Comparable to conventional lumber for most residential header/beam spans

- No shimming

LSL ADVANTAGES – BEAMS AND

HEADERS

ONE-PIECE HEADERS

- Convenient widths

HOLES - Large hole capacity

CONSISTENT /UNIFORM

LSL ADVANTAGES – RIM BOARD

LONG SECTIONS

- Longer pieces for faster installation reducing labor and materials costs

STRENGTH - Higher diaphragm shear values than 11⁄8" OSB; Stronger than comparably sized conventional lumber

NAILING - Provides a wider nailing surface for subfloor panels; Superior fastener retention minimizes squeaks

COMPARISON OF PRODUCT QUALITIES

LSL - Strong Most residential loads and spans Thicknesses good for one-piece headers Large hole capability Superior fastener retention minimizes squeaks Warp resistance good for straight walls / tall walls Size for size, stronger than dimensional lumber Reduces aesthetic blemishes (drywall cracks, etc.)

LVL - Stronger Deeper depths Versatile, multi-ply applications Available with water sealant

PSL - Strongest Large beams, heavy loads Exposed beams, treated applications

COMPARISON OF DESIGN PROPERTIES

Product

M.O.E Fb Fv Beam

Header

Column/Stud

LSL 1.3 E 1700 400 BEST

1.55 E

2325 310 GOOD BEST

LVL 1.9 E 2600 285 BETTER GOOD

PSL 2.0 E 2900 290BEST

GOOD FOR

LARGE

1.8 E 2400 190 BEST

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COMPARISON OF PRODUCT APPLICATIONS

Product

Beams/Header

Joists

Exposed Exterior

Column/Post

Tall WallStud Rim

Stair stringer

Short span

Long span

LSL

LVL

PSL

I-joist

√ √ √ √ √

√ √ √ √

√ √ √ √

√ √

√

WOODEN I-JOIST

FlangeWeb

Flange

Web

I-JOIST APPLICATIONS

FLOORS ROOFS

RIM

I-JOIST ADVANTAGES

LONG SPANS

PREDICTABLE PERFORMANCE

STRAIGHT/TRUE

- Can be used for longer spans than comparably sized conventional lumber

- No significant effect from lumber defects

- No bowing, shrinking, or twisting

STRENGTH/WEIGHT

- Supports heavier loads than comparably sized conventional lumber

HOW & WHY AN I–JOIST WORKS

LOAD

HOW & WHY AN I–JOIST WORKS

T E N S I O N

COMPRESSION

LOAD

Zero Stress in Bending

I-JOIST DESIGN PROPERTIES

29

Load Deflection

DEFLECTION

I-JOIST DESIGN PROPERTIES

30

The curvature built into a member usually for the purpose of offsetting sag.

Camber

CAMBER

I-JOIST DESIGN CONSIDERATIONS

Flange and web dimensions and material can vary between manufacturers!

≠

I-JOIST DESIGN CONSIDERATIONS

Use the appropriate manufacturer’s proprietary design values and details when specifying.

1-3/4”

1-1/2”• 9-1/2” • 11-7/8”• 14” 3/8

”3/8”

2-5/16”

1-3/8”• 9-1/2” • 11-7/8”• 14” • 16”

1-3/4”

• 9-1/2” • 11-7/8”

3/8”

1-3/8”

This includes:

Span & PLF tables

Allowable hole charts

Installation & connection details

SPAN vs LENGTH

LENGTH Length measured along the

member from end to end. Used for ordering material.

SPANThe horizontally projected distance between member supports. Used for sizing calculations.

Clear Span

Length

Design Span

Out-to-Out

SIMPLE vs CONTINUOUS SPAN

Simple Span

Span

Span Span

Continuous Span

WHAT TO WATCH OUT FOR

CONNECTIONS – OVER-NAILING I-JOISTS

Nail into plate w/1 [0.131”

x 3”] from end into plate DO NOT Nail into

platew/multiple nails

CONNECTIONS - LVL DETAILING

Up to 4 members can be site-connected

Depths 16” and over must include at least two plies

Side-loaded beams require additional connection detailing

Consult manufacturer’s representative or literature

Note: Illustration for

purpose of example only

NOTCHES - DO NOT NOTCH!

HOLES - WITHIN GUIDELINES

√

HOLES - WITHIN GUIDELINES

√

STACKING LOADS AND I-JOISTS

45o

Application MUST belooked at with software !

NON-STACKING LOADS AND I-JOISTS

SLIGHT OFFSET WITH I-JOISTS: Shear transfer through web Web knifing

REVIEW Name some advantages of specifying:

Parallel Strand Lumber (PSL)

Laminated Veneer Lumber (LVL)

Laminated Strand Lumber (LSL)

Which engineered wood product is best for: Long-span joists?

Exterior column?

Short-span header over a kitchen window?

Rim?

What considerations must be made concerning i-joist floors with walls above?

QUESTIONS

?

THANK YOU FOR YOUR TIME!

45

7800 E. Orchard Rd., Suite 200Greenwood Village, CO 80111

This concludes the American Institute of ArchitectsContinuing Education System Program