Simpson Strong-Tie Wood Construction Connectors

Simpson Strong-Tie ® Wood Construction Connectors

Straps and Ties General Notes

These general notes are provided to ensure proper installation of Simpson Strong-Tie straps and ties. a. The (160) loads have been increased for wind or earthquake loading, with no further increase allowed. Reduce where other loads govern. b. When installing strap over wood structural panel sheathing, use 2 1/2 "- long nails minimum.

c. SD screws are Simpson Strong-Tie ® Strong-Drive ® SD Connector screws. See pp. 21–22 for additional fastener information. d. For straight straps in tension, use half of the fasteners in each member being connected to achieve the listed loads. e. Tension loads apply for uplift when installed vertically. f. Field-bending straps is not recommended unless otherwise noted. g. If wood splitting is a concern, consider spacing the nails at every other location. h. The cut length of coil strap shall be equal to twice the “end length” noted in the tables plus the clear-span dimension. i. Straps 16 ga. and heavier can be fillet welded to structural steel members. The designer shall specify the weld size and length. Welding and specification shall be in compliance with the current American Welding Society ANSI/AWS D1.3, Structural Welding Code – Sheet Steel.

Load Adjustment Factors for Optional Fasteners Used with Straight Straps

Allowable Load Adjustment Factor

Connector Table Nail

Replacement Fastener

0.131" x 1 1/2 "

#9 x 1 1/2 " SD Connector screw 1.00

0.131" x 1 1/2 " 1.00 #9 x 1 1/2 " SD Connector screw 1.00 #9 x 1 1/2 " SD Connector screw 1.00 0.131" x 1 1/2 " 0.83

0.131" x 2 1/2 "

0.148" x 1 1/2 "

0.131" x 1 1/2 "

0.83

0.131" x 2 1/2 "

0.83

0.148" x 1 1/4 "

1.00 6

0.148" x 2 1/2 " 0.148" x 3" 0.148" x 3 1/4 "

0.148" x 1 1/2 "

1.00 6

0.148" x 2 1/2 "

1.00

0.148" x 3 1/4 " 1.00 #9 x 1 1/2 " SD Connector screw 1.00 #9 x 2 1/2 " SD Connector screw 1.00

Straps and Ties

When installing floor-to-floor straps, wood shrinkage and compression that occurs during construction may cause the straps to bow out if both ends of the strap are nailed during initial installation. To prevent this, filling all fastener holes in the strap (including the rim joist area) will limit the bowing. Alternatively, fill the holes in the top of the strap before the roof is installed and then filling the bottom half of the strap after will also help reduce bowing.

0.148" x 1 1/2 "

0.84 5

0.148" x 2 1/2 "

0.84

0.148" x 3"

0.84

0.162" x 2 1/2 " 0.162" x 3 1/2 "

0.148" x 3 1/4 "

0.84

0.162" x 2 1/2 " 1.00 6 #10 x 1 1/2 " SD Connector screw 1.00 #10 x 2 1/2 " SD Connector screw 1.00

C-C-2021 ©2021 SIMPSON STRONG-TIE COMPANY INC.

1. Allowable load adjustment factors shown in the table are applicable to all straight straps throughout this catalog, except as noted in the footnotes below. 2. Some products have been tested specifically with alternative fasteners and have allowable load adjustment factors or reduced capacities published on the specific product page. Values published on the product page may be used in lieu of using this table. 3. For straps installed over wood structural panel sheathing, use a 2 1/2 "-long fastener minimum. 4. This table does not apply to straps made of steel thicker than 10 ga. 5. Where noted, use 0.80 for 10 ga., 11 ga., and 12 ga. products when using SPF lumber. 6. Where noted, use 0.92 for 10 ga., 11 ga., and 12 ga. products when using SPF lumber.

Not Sure How Much Coil Strap You Need?

Simpson Strong-Tie has a web-based app, the Coil Strap Calculator , which can help you quickly determine the cut length of each strap and the total amount of coil strap needed for each application on a project. For more information or to access, go to strongtie.com/webapps .

Coiled Strap Calculator

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