Fire Protective Options for I-Joist Floor Systems

Wood I-joist floor assemblies are a superior choice in residential construction because the I-joists give builders and homeowners a high-quality floor system that is reliable, flatter and quieter. Some states and jurisdictions have updated their requirements related to floor system performance. The 2012, 2015 and 2018 International Residential Code (IRC) includes provisions to enhance the fire performance of floor systems.

This publication is designed for: architects, engineers, builders, contractors

This publication provides seven code-compliant methods for fire-protective I-joist floor system. These methods can be used in jurisdictions where the 2012 IRC Section R501.3 or the 2015 and 2018 IRC Section R302.13 has been adopted and implemented.

Key sections include:

• Gypsum board installed on top of the bottom flange

• Gypsum board or wood structural panel ceiling membranes

• Gypsum board attached to I-joist webs

• Gypsum board attached to the entire depth of I-joists

• Mineral wood insulation on the top of the bottom flanges

• Fire protective coatings

Published by APA — The Engineered Wood Association.