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    plywood vs gypsum board

    plywood vs gypsum board

    New postby mtCDCcb on Mon Feb 23, 2015 4:57 pm

    Does the residential code allow for plywood to be used as an interior finish instead of gypsum board? I assume it is not allowed where 1 hour separation is required (ceiling of garage with living space above). Thanks.
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    Re: plywood vs gypsum board

    New postby Jerry Peck - Codeman on Mon Feb 23, 2015 9:31 pm

    The residential code does not really get into interior finishes, other than minimum 1/2" gypsum board on the garage side of the walls and ceiling separating the garage from the house and its attic, or, as you mentioned, 5/8" Type C on the ceiling if there is living space above the garage (not really a 1 hour rated ceiling and not addressed as such, just a requirement for 5/8" Type C on the ceiling (and protecting the supporting structure with 1/2" gypsum board).

    The only thing I can think of right now which may affect the use of plywood on the interior of the living might be air infiltration / exfiltration and the R-rating for walls with plywood/OSB on them - but that could be addressed with vapor barriers / retarders installed behind the plywood / OSB.

    Of course, though, one would not want to use plywood / OSB on walls at wet areas.
    Jerry Peck - CodeMan
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    Return to Fire-rated assemblies: Fire walls, fire partitions, smoke barriers, ceiling-floor, ceiling-attic; Separation of garages from dwelling unit; Separation between structure's exterior walls and property line



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