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Basic Facts of Residential Engineered Lumber
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  1. Basic Facts of Residential Engineered Lumber AIA Course BLS100 1 LU + 1 HSW

  2. 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!

  3. 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.

  4. 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

  5. Common Engineered Lumber Products Parallel Strand Lumber Laminated Strand Lumber Laminated Veneer Lumber Wooden I-Joists

  6. parallel strand lumber (psl)

  7. PSL Applications Exterior Deck Posts and Beams Headers and Beams • exposed beams and columns • HighMoistureEnvironments

  8. psl sizes – beams and headers • Widths • 2 11⁄16” • 3 1⁄2” • 5 1⁄4” • 7" • Depths • 9 1⁄4” • 9 1⁄2” • 11 1⁄4” • 11 7⁄8” • 14” • 16” • 18” D W * CAUTION! Treated products vary in size and availability by market and manufacturer. Confirm availability before specifying!

  9. 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” • Column Sizes W2 W1

  10. PSL Advantages • Large loads • Supports heavier loads than comparably sized conventional Glulam or solid-sawn lumber • Supports long spans for open floor plans • Long Spans • Excellent for cantilever & multi-span applications • cantilevers/ multi-span • Exposed • Exposed PSL beams add aesthetic value • Can be treated for exterior uses (regional) • Exterior

  11. laminated veneer lumber (lvl)

  12. LVL applications Headers Beams

  13. LVL Sizes Depths: • 5 ½” • 7 ¼” • 9 ½” • 11 7/8” • 14” • 16” • 18” Width: 1 ¾” (common to use multi-ply members)

  14. LVL advantages • Multi-ply applications • Up to 4 members can be site-connected • No bowing, shrinking, or twisting • straight/true • Supports heavier loads than comparably sized conventional lumber • strength/weight • No significant effect from lumber defects • Predictable Performance

  15. laminated strand lumber (lsl)

  16. lsl applications Headers Beams Wall Framing Roof joists Columns • Rim board • Stair Stringers

  17. Lsl sizes Widths • 1 ¾” • 3 ½” Headers and Beams rim board studs Widths • 1 ¼” • 1 1/8” * • Sections • 2x4 • 2x6 • 1¾” x 5½” • 2x8 • 1¾” x 7¼” • Depths • 43⁄8” • 51⁄2” • 71⁄4” • 85⁄8” • 9 1⁄4” • Depths • 9 1⁄2” • 11 1⁄4” • 11 7⁄8” • 14” • 16” • 9 1⁄2” • 11 ½” • 14” • 16” • Lengths • 2x4 – 14’ • 2x6 – 22’ • 2x8 – 30’ * The lateral load transfer capacity of thinner rim boards is not equivalent to 2" nominal framing and is limited by code to 180 plf.

  18. LsL advantages - Walls • No shimming on headers or studs; eliminates culls • Consistent /uniform • Dimensional stability results in solid, straight walls • straight/true • Eliminates the “hinge” point in tall walls • Tall walls

  19. lsladvantages – Beams and headers • No shimming • Consistent /uniform • Convenient widths • One-piece headers • Strength (short spans) • Comparable to conventional lumber for most residential header/beam spans • holes • Large hole capacity

  20. lsl advantages – Rim Board • Longer pieces for faster installation reducing labor and materials costs • Long sections • Higher diaphragm shear values than 11⁄8" OSB; Stronger than comparably sized conventional lumber • strength • Provides a wider nailing surface for subfloor panels; Superior fastener retention minimizes squeaks • nailing

  21. 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

  22. comparison of design properties

  23. comparison of Product Applications √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √

  24. Wooden I-Joist Flange Web Flange Web

  25. I-Joist applications Floors roofs rim

  26. i-joist advantages • Can be used for longer spans than comparably sized conventional lumber • Long spans • Predictable Performance • No significant effect from lumber defects • No bowing, shrinking, or twisting • straight/true • Supports heavier loads than comparably sized conventional lumber • strength/weight

  27. How & Why an I–Joist Works Load

  28. How & Why an I–Joist Works Load Compression Zero Stress in Bending tension

  29. Deflection Load I-joist Design properties deflection

  30. Camber I-joist Design properties • Camber The curvature built into a member usually for the purpose of offsetting sag.

  31. I-Joist design considerations ≠ Flange and web dimensions and material can vary between manufacturers!

  32. I-Joist design considerations • This includes: • Span & PLF tables • Allowable hole charts • Installation & connection details 1-3/4” 1-3/4” 2-5/16” • 9-1/2” • 11-7/8” • 14” • 9-1/2” • 11-7/8” • 14” • 16” • 9-1/2” • 11-7/8” 1-3/8” 1-1/2” 1-3/8” 3/8” 3/8” 3/8” Use the appropriate manufacturer’s proprietary design values and details when specifying.

  33. Span vs Length Span Length The horizontally projected distance between member supports. Used for sizing calculations. Length measured along the member from end to end. Used for ordering material. Design Span Clear Span Length Out-to-Out

  34. simple vscontinuous span Simple Span Continuous Span Span Span Span

  35. What to watch out for

  36. connections – Over-nailing I-joists Nail into plate w/1 [0.131” x 3”] from end into plate DO NOT Nail into plate w/multiple nails

  37. 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

  38. Notches - DO NOT notch!

  39. Holes - Within Guidelines

  40. Holes - Within Guidelines

  41. stacking loads and I-joists

  42. Non-stacking Loads and I-joists Slight offset with I-joists: • Shear transfer through web • Web knifing Application MUST be looked at with software ! 45o

  43. review • Name some advantages of specifying: • Parallel Strand Lumber (PSL) • Laminated Veneer Lumber (LVL) • LaminatedStrand 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?

  44. Questions ?

  45. 7800 E. Orchard Rd., Suite 200 Greenwood Village, CO 80111 THANK YOU FOR YOUR TIME! • This concludes the • American Institute of Architects • Continuing Education System Program