Quote:
Originally Posted by Altavia
Look for certification/label it meets minimum 3/8-inch (9.53 mm) (nominal) fire-retardant-treated structural panel is deemed to meet the 20-minute thermal barrier test based on ASTM E 119, Test Methods for Fire Tests of Building Construction and Materials, or deemed to have the fire resistance of or equivalent to ½-inch (12.7 mm) gypsum wall board.
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Interesting. My attic opening, installed by the builder is drywall, not plywood. But, it looks like you can buy a fire-rated or and a non-fire rated folding attic stair. If you are installing it in the garage, you would need to use a stair assembly that provides a one-hour fire rating to comply with the building code for the garage ceiling. But, if you are installing the stair inside the living space, the ceiling does not need to be fire rated, so, I assume you could use a non-fire rated stair assembly. Good to know if you plan to add an attic stair in your garage.