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SDWS Timber SS — Allowable Shear Loads — Douglas Fir–Larch, Southern Pine Lumber

See footnotes below.

SDWS Timber SS — Allowable Shear Loads — Hem-Fir, Spruce-Pine-Fir Lumber

1. All applications are based on full penetration into the main member. Full penetration is the screw length minus the side member thickness.
2. Allowable loads are shown at the wood load duration factor of C_D = 1.0. Loads may be increased for load duration per the building code up to a C_D = 1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
3. For minimum fastener spacing requirements for both side and main members, see the Spacing Requirements Figure and Table below.
4. For in-service moisture content greater than 19%, use C_M = 0.7.
5. Loads are based on installation into the side grain of the wood with the screw axis perpendicular to the face of the member.
6. The tabulated reference withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain of the main member.
7. The tabulated reference withdrawal design value, W_max, is in pounds where the entire thread length must penetrate into the side grain of the main member.
8. Embedded thread length is that portion held in the main member including the screw point.
9. Values are based on the lesser of withdrawal from the main member or pull-through of a 1 1/2" side member.

SDWS Timber SS Screw Spacing Requirements

1. For axial loading only, use the following minimum dimensions: end distance = 4", edge distance = 1 5/8", spacing parallel to grain = 2 7/8", spacing perpendicular to grain = 2".

SDWS TIMBER SS Screw — 2021 and 2018 IRC Compliant Spacing for a Sawn Lumber Deck Ledger-to-Rim Board

1. SDWS27SS screw spacing values are equivalent to 2021/2018 IRC Table R507.9.1.3(1) and 2015 IRC Table R507.2. The table also provides SDWS27SS screw spacing for a wider range of materials commonly used for rim board, and an alternate loading condition as required by some jurisdictions.
2. Solid-sawn rim board shall be spruce-pine-fir, hem-fir, Douglas fir–larch, or southern pine species. Ledger shall be hem-fir, Douglas fir–larch, or southern pine species.
3. Fastener spacings are based on the lesser of single fastener ICCES AC233 testing of the Strong-Drive SDWS27SS screw with a safety factor of 5.0 or ICC-ES AC13 assembly testing with a factor of safety of 5.0. Spacing includes NDS wet service factor adjustment.
4. Screws shall be placed 1.5" to 2" from the top and bottom of the ledger or rim board with 3" minimum and 6" maximum vertical distance between fasteners with horizontal on-center spacing per the table. End screws shall be located 6" from the end and at 1.5" to 2" from the bottom of the ledger. For screws located at least 2" but less than 6" from the end, use 50% of the load per screw and 50% of the table spacing between the end screw and the adjacent screw, and for screws located between 2" and 4" from the end, predrill using a 3/16" drill bit.
5. Structural sheathing between the ledger and rim board shall be a maximum of 1/2" thick and fastened per code.

See the Fastening Systems Technical Guide and refer to the Alphabetical Index for additional load tables, technical data and installation instructions for the Strong-Drive® SDWS Timber SS screw.

Code Reports & Compliance

Drawings