TimberStrand LSL Rim Board Stair Stringer ... - Weyerhaeuser

TiMBeRSTRand ®
lSl
RiM BoaRd STaiR
STRinGeRS
The ideal Solution for Strong, Stable Stairs
• Straight and Consistent
• Eliminates Adjustments for Shrinkage
• Minimizes Material Waste
• Resists Bowing, Twisting, and Shrinking
• Significantly Reduces Callbacks
• Better Nail Holding Capability
• Limited Product Warranty
WoodBYWY.CoM 1.888.453.8358
#TJ-8003 SPECIFIER’S GUIDE

Let-in 2x4 nailer. Use
eight 10d (0.148" x 3")
nails, staggered. Nail into
framing members below.
At concrete floors use
three 1⁄2" dia. x 3" long
anchor bolts.
TRuS JoiST ® 1¼" TiMBeRSTRand ® lSl
Suggested Residential Stringer Attachment Details
40 psf Live Load and 12 psf Dead Load
(1) Minimum throat depths may be reduced by an additional ¼" for 11 7 ⁄8" and 14" material depths if 2x4 reinforcement is
used and provided total rises and runs are limited to table values for unreinforced stringers.
(2) Minimum No. 2 hem-fir, spruce-pine-fir or better grade.
Glossary
Term Definition
(A) Material Depth Depth of product before steps are cut.
(B) Step Rise Unit rise of individual step.
(C) Step Run Unit run of individual run (nosing ignored).
(D) Stringer Run Horizontal span between stairway supports.
(E) Throat Depth
Use subfloor adhesive
to improve the stair
performance and
minimize squeaks
10" min. run
CAUTION
Stair stringer tables and attachment details are intended for use with
TimberStrand ® LSL only. Consult designer for attachment details for live loads greater than 40 psf.
11/4" 1.3E TimberStrand ® LSL
Low End
Sawn out to
receive treads
and risers
Alternate step style.
Maintain minimum throat depth.
73⁄4"
max.
rise
12" max. on top
or bottom end
Net depth of stringer once steps are cut.
Measured from step perpendicular to bottom edge
of stringer.
Throat depth: (1)
3 3 ⁄8" min. at 91⁄2" rim board
53⁄4" min. at 11 7 ⁄8" rim board
7 7 ⁄8" min. at 14" rim board
Optional continuous 2x4
reinforcement (2) on one side
flush to bottom edge. Nail
with 10d (0.128" x 3") nails
at 12" on-center, staggered.
Allowable Design Stresses Specified Strengths
(100% Load Duration)
(1)
(Standard Term)
Shear modulus of elasticity G = 81,250 psi 81,250 psi
Modulus of elasticity E = 1.3 x 106 psi 1.3 x 106 psi
Flexural stress Fb = 1,700 psi (2) 3,140 psi (1)
Compression perpendicular to grain Fc⊥ = 680 psi (3) 1,240 psi (2)
Compression parallel to grain FcII = 1,400 psi 2,235 psi
Horizontal shear perpendicular Fv = 400 psi 745 psi
(1) Specified strengths are based on Limit States Design per CSA O86-01.
12
(2) For 12" depth. For others, multiply by [ d ]
0.092
(3) Fc⊥ shall not be increased for duration of load.
Trus Joist ® TimberStrand LSL ® Rim Board Stair Stringer Specifier’s Guide TJ-8003 March 2012
2
B
C
TimberStrand ® LSL
stair stringers are intended
for dry‑use applications.
D
E
A
Notch. Tight fit.
Code Evaluations: See HUD MR 1265, CCMC 12627-R, and ICC ES ESR-1387
Three 16d
(0.162" x 31⁄2")
nails per stud
High End
A35 framing anchor by Simpson
Strong-Tie ® or MPA1 anchor by USP
Structural Connectors ® or equal.
Fasten with twelve 8d (0.131" x 11⁄2")
nails. Use two framing anchors with
14" rim board.
Studs at 16" on-center
maximum
Toenail stringer
to ledger with one
8d (0.131" x 21⁄2")
nail per side
2x8 ledger
DO NOT over cut stair stringer
WARNING: Drilling, sawing, sanding
or machining wood products
generates wood dust, a substance
known to the State of California
to cause cancer. For more
information on Proposition 65,
visit www.wy.com/inform.

Multiple Span
Stringer run Stringer run
with intermediate support
100 psf Live Load and 12 psf Dead Load
TRuS JoiST ® 1¼" TiMBeRSTRand ® lSl
Maximum Stringer Run for 11/4" 1.3E TimberStrand ® LSL
Simple Span
Stringer run
without intermediate support
40 psf Live Load and 12 psf Dead Load
36" Tread Width 42" Tread Width 44" Tread Width 48" Tread Width
Material
2 Stringers 3 Stringers 3 Stringers 3 Stringers 3 Stringers
Depth Without With 2x4 Without With 2x4 Without With 2x4 Without With 2x4 Without With 2x4
Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement
91⁄2" 5'-0" 5'-10" 5'-10" 7'-6" 5'-10" 6'-8" 5'-10" 6'-8" 5'-0" 6'-8"
117 ⁄ 8" 8'-4" 10'-0" 10'-0" 10'-10" 9'-2" 10'-10" 9'-2" 10'-0" 9'-2" 10'-0"
14" 11'-8" 11'-8" 13'-4" 13'-4" 12'-6" 12'-6" 12'-6" 12'-6" 11'-8" 11'-8"
36" Tread Width 42" Tread Width 44" Tread Width 48" Tread Width
Material
2 Stringers 3 Stringers 3 Stringers 3 Stringers 3 Stringers
Depth Without With 2x4 Without With 2x4 Without With 2x4 Without With 2x4 Without With 2x4
Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement Reinforcement
91⁄2" 3'-4" 4'-2" 4'-2" 5'-0" 4'-2" 5'-0" 4'-2" 5'-0" 3'-4" 4'-2"
117 ⁄ 8" 6'-8" 6'-8" 7'-6" 8'-4" 6'-8" 7'-6" 6'-8" 7'-6" 6'-8" 7'-6"
14" 8'-4" 8'-4" 10'-0" 10'-0" 9'-2" 9'-2" 9'-2" 9'-2" 9'-2" 9'-2"
General Notes
■ Maximum stringer runs shown are valid for U.S. codes (Allowable Stress Design) or
Canadian codes (Limit States Design). Loads shown are unfactored.
■ Deflection criteria of L/360 live load and L/240 total load.
■ Stairway assembly is unstable until treads are installed.
■ Use subfloor adhesive to improve the stair performance and minimize squeaks.
■ Tables based on 73⁄4" maximum rise and 10" minimum run. Local codes may be
more restrictive.
■ Maximum rise between floors or landings permitted by code is 12'-0".
■ Keep materials dry. Add a vapor barrier at the bottom of the stair stringer if it is in
contact with concrete.
■ The attachment details shown are suggestions only; alternate details are possible.
Responsibility remains with the design professional of record.
■ For assistance with loading conditions and stair configurations not shown,
contact your Weyerhaeuser representative.
Two Stringer Option
Trus Joist ® TimberStrand LSL ® Rim Board Stair Stringer Specifier’s Guide TJ-8003 March 2012
3
Three Stringer Option
1⁄2 1⁄2
General Guidelines for Calculating Step Rise
and Run
■ The rise times the run should equal approximately 75".
■ Two times the rise plus one run should equal approximately 25".
■ Rise plus run should be 17" to 18".
Protect products
from sun and water
PRODUCT
STORAGE
u i m
8 3 358
T
88 5 358
CAUTION:
Wrap is slippery when wet or icy
Use support blocks at
10' on‑center to keep
products out of mud
and water

We Can Help You Build SMaRTeR
You want to build solid and durable structures—we want to help. Weyerhaeuser
provides high-quality building products and unparalleled technical and field
assistance to support you and your project from start to finish.
Floors and Roofs: Start with the best framing components in the industry: our
Trus Joist ® TJI ® joists; TimberStrand ® LSL rim board; and TimberStrand ® LSL,
Microllam ® LVL, and Parallam ® PSL headers and beams. Pull them all together
with our self-gapping and self-draining Weyerhaeuser ® Edge Gold floor panels
and durable Weyerhaeuser ® roof sheathing.
Walls: Get the best value out of your framing package—use TimberStrand ® LSL
studs for tall walls, kitchens, and bathrooms, and our traditional, solid-sawn
lumber everywhere else. Cut down installation time by using TimberStrand ® LSL
headers for doors and windows, and Weyerhaeuser ® wall sheathing with its handy
two-way nail lines. Use our TJ ® Shear Brace for extra support in walls with large
openings or in high wind or seismic areas.
Software Solutions: Whether you are a design professional or lumber dealer,
Weyerhaeuser offers an array of software packages to help you specify individual
framing members, create cut lists, manage inventories—even help you design a
complete structural frame. Contact your Weyerhaeuser representative to find out
how to get the software you need.
Technical Support: Need technical help? Weyerhaeuser has one of the largest
networks of engineers and sales representatives in the business. Call us for help,
and a skilled member from our team of experts will answer your questions and
work with you to develop solutions that meet all your structural framing needs.
Visit www.woodbywy.com/warranty for copies of this and other
Trus Joist ® Engineered Wood Product warranties.
March 2012 ■ Reorder TJ-8003
This document supersedes all previous versions. If this is more
than one year old, contact your dealer or Weyerhaeuser rep.
NW
ConTaCT uS
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