Flame Spread Index of APA Performance-Rated Wood Structural Panels
Technical Topic
Wood structural panels are widely used in construction, but their fire performance characteristics must meet specific building code requirements.
This publication is designed for: architects, engineers, builders, designers, and code officials
The document presents comprehensive test data from 2016 ASTM E84 and UL 723 testing, showing that APA-trademarked wood structural panels achieve flame spread index values ranging from 35 to 110 and smoke-developed index values from 50 to 175. It explains the International Building Code classification system (Class A, B, and C) and clarifies which panel products qualify for interior finish applications in various occupancies. The publication also addresses special cases, including fire retardant treated plywood options and Canadian code differences.
Published by APA — The Engineered Wood Association.
