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. The cause appears to be certain fire retardant chemicals that are activated under environmental conditions of high temperature and moisture content. Fx lumber guard xt frt osb sheathing provides higher design values than pressure impregnated frtw plywood at the same thickness and creates a superior substrate for securely fastening exterior facing.
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