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The new 2019–2020 Wood Construction Connector catalog (C-C-2019) is the first in the industry with connector allowable load tables updated to meet the ASTM test standards in the 2015 International Building Code® (IBC®).

Both the 2015 and 2018 IBC and the International Residential Code® (IRC®) require manufacturers to test joist hangers and similar products to a new standard, ASTM D7147, Standard Specification for Testing and Establishing Loads of Joist Hangers.

Simpson Strong-Tie has re-evaluated all of its related wood connectors to meet the new test standard. This is reflected in 15 ICC-ES and 3 IAPMO UES evaluation reports covering 200 product series — the most in the industry helping ensure product compliance for specifiers. All of our connector IBC code reports have now been updated to the 2015 IBC, and 85% of the connector reports have been updated to the 2018 IBC.

This page features information and links to help you learn more about the changes to the test standards, how we re-evaluated all our hangers, and where to find out which I-Codes® are enforced in your jurisdiction.

FAQs About the Changes to the Code

What changed in the 2015 IBC that prompted Simpson Strong-Tie to retest or re-evaluate all its connectors and their load values?

The 2015 IBC changed the requirements for how allowable loads on some connectors are determined. Section 2303.5 of the 2015 IBC specifies that joist hangers shall be tested per ASTM D7147, Standard Specification for Testing and Establishing Allowable Loads of Joist Hangers. Previous versions of the IBC required testing to comply with ASTM D1761, Test Method for Mechanical Fasteners in Wood. Both standards determine a connector's allowable load as the lowest of the following:

  1. Lowest ultimate load of three tests (or average of 6) with a safety factor of 3
  2. Average load at 1/8" deflection
  3. Calculations per American Wood Council National Design Specification for Wood Construction (NDS)

The primary changes in ASTM D7147 are requirements to measure properties of the tested materials, such as steel strength, fastener strength and wood specific gravity. When tested material properties exceed the specified properties, report holders are required to adjust the tested ultimate loads to account for the material over-strength.

These requirements have been added to ICC-ES AC13 Acceptance Criteria for Joist Hangers and Similar Devices and IAPMO UES EC 002, Testing and Analysis of Joist Hangers and Miscellaneous Connectors.

Building Code Resources for Specifiers

2015 International Building Code

2015 International Building Code

This comprehensive building code establishes minimum regulations for building systems using prescriptive and performance-related provisions.

See the Free ICC Site

International Code Council Map

International Code Council IBC Map

Use the ICC interactive map to select your state and view its currently adopted code title.

View the ICC Map

Code Report: Understanding Allowable Load Changes

Code Report: Understanding Allowable Load Changes

This blog post provides in-depth background about how we re-evaluated our connectors to meet the new standards.

Visit the SE Blog