Posted by MGH (A) on May 07, 2009 at 22:09:08

Hi, I'm building a dedicated 2 channel room in my house that is being built as we speak. It's about 15.4 W x 10 H x 22 L feet and located on the second floor - actually the only room on the second floor. I told the builder the front, back, and side walls have to be double sheet rocked (total 1 inch in thickness). The walls have R15 insulation, the floor has R30 insulation, and ceiling has R40? (blown insulation). Floor will be carpeted. Now the problem is this. On the other side of one of the long side walls is the attic space. I thought that the outer side of the long wall facing the attic space will have a single layer of sheet rock (half inch). But the builder just told me there will be no sheet rock, just the insulation and a thin "waterproof" insulation. Same situation for the front wall possibly. Will this be a problem acoustically?

The back wall has single sheet rock on outer side and the other long side wall is actually is part of the wall of the house facing outdoors lined by brick.

Edits: 05/07/09