Does OSB Have A Fire Rating?
Does OSB Have A Fire Rating? Flame Spread Ratings Material Flame Spread Rating PS 1 construction plywood 75-200 OSB 74-200 Is OSB more fire resistant than plywood? FRT plywood has a flame spread rating, but no rating for burn-through resistance. Fire-rated OSB sheathing has load/span and shear design values that are superior to FRT plywood