Technical Digest 10 Design of Fire-Resistant Assemblies With Steel Joists

Description

Technical Digest No. 10 is intended to make it easier for the designer to find a fire-resistant steel joist assembly which suits his purpose and to give guidance in the changes which can be made to published design listings without decreasing the fire endurance, including:

• Comprehensive and informative review of fire ratings
• Step-by-step procedure for substituting K-Series joists in assemblies containing “S”, “J” and/or “H” Series joists
• The appendix includes a complete listing of U.L. fire rated assemblies containing steel joists. Conveniently arranged by hourly rating, type of protection, insulation, floor/deck type, and minimum joist size and spacing.
• 2026 updates include:
  • References the Underwriters Laboratories online UL Product Spec™ tool rather than the Fire Resistance Directory
  • A full glossary addition
  • Chapter 4 includes new criteria published within the UL Underwriters Laboratories, Inc., online UL Product Spec™ preamble for Cold-Formed Joists and Alternate Web Member Shapes based on recent research conducted as adopted by UL.
  • Reference list updates
  • UL Design Tables showing fire-rated assemblies in the appendix updated
  • Numerous design have been removed and new ones added

Chapters include:

• Fire resistance ratings
• Design of fire-resistive assemblies
• Adapting test results to field conditions
• Extrapolation from fire test design listings
• Substituting K-series joists in U.L. fire rated assemblies listings S-, J-, and/or H-series joists

Published Third Edition January 2026