Thermal degradation of fire retardant treated plywood between 1985 and 1995 approximately 750 000 multi family housing units experienced roofing problems due to fire retardant treated frt plywood sheathing failure figs. Balconies and exterior walls constructed of exterior fire x may be considered non combustible by some building codes. It s common for fire rated osb sheathing to be a code compliant component of numerous ul and intertek listed exterior and interior load bearing wall assemblies.
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