basic facts of residential engineered lumber
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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). - PowerPoint PPT PresentationTRANSCRIPT
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
√
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