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<h1>How We Determine Allowable Loads</h1>


 Allowable loads in this catalog are determined by calculations and test
 criteria established by industry, such as ICC-ES Acceptance Criteria, IAPMO
 UES Evaluation Criteria and ASTM test standards.



 Connectors are typically evaluated in accordance with ICC-ES AC13 &mdash;
 Acceptance Criteria for Joist Hangers and Similar Devices. Evaluation is based
 on a minimum of three static load tests in wood assemblies. The published
 allowable load is the lower of the tested ultimate with a safety factor of 3,
 load at 1⁄8" deflection or the NDS fastener calculation limits.



 Holdowns and tension ties are tested in accordance with ICC-ES AC155 &mdash;
 Acceptance Criteria for Hold-Downs (Tie-Downs) Attached to Wood Members.
 Allowable loads are based on the lower of three static load tests with a
 safety factor, deflection limits or NDS fastener calculation limits. Static
 load tests include holdown testing on steel jigs and wood assembly tests.



 Cast-in-place concrete products are tested in accordance with ICC-ES AC398
 &mdash; Cast-in-Place, Cold-Formed Steel Connectors in Concrete for
 Light-Frame Construction or AC399 &mdash; Cast-in-Place Proprietary Bolts in
 Concrete for Light-Frame Construction. Threaded fasteners are evaluated per
 AC233 &mdash; Alternate Dowel-Type Threaded Fasteners.



 Where a test standard is unavailable, testing is conducted per sound
 engineering principles. Some tests include only portions of a product, such as
 purlin anchor tests, wherein only the embedded hook is tested, not the nailed
 or bolted section of the strap, which is calculated. Testing to determine
 allowable loads in this catalog is not done on connection systems in
 buildings. Testing is conducted under the supervision of an independent
 laboratory.



 For detailed information regarding how Simpson Strong-Tie tests specific
 products, <a href="/contact">contact Simpson Strong-Tie</a>.

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