Hi guys,
I'm in the process of converting a garage to a mix room and we've determined that one of the interior 2x6 walls will be facing the inside of a garage door (we're framing inside the door perimeter). This is not a "watertight" membrane and even with silicone sealant the door has glass windows in the door so exposed drywall is not a good idea for mold and mildew purposes.
More to the point. Instead of using 5/8 drywall on the "outside" of this wall we thought about using 1/2" OSB and painting over it. My concern is that the STC of 1/2" OSB may not meet that of 5/8" drywall. I can't find anything on the Net one way or the other to clarify this for me. Would the STC ratings be sufficient enough using JUST 1/2" OSB on the outside facing wall or do we need to add another layer of 1/2" drywall underneath the OSB for better reduction purposes?
The real problem we have with double layers on this outside facing wall (1/2" drywall and OSB) is that it will be awfully heavy to lift into place once the wall is done. The contractor and I are trying to determine a smarter solution. I'm open to ideas...removal of the door is not an option though.