John Sayers' Recording Studio Design Forum Archive

Hi guys,

I'm constructing two acoustic windows for my backyard home recording studio. Without Rod's book, I wouldn't even dream of such an undertaking, but he brings it down to a level that even I can understand!

It looks like I'll be able to swing 1/2" and 3/4" laminated glass. Each window will consist of 1/2" glass + 8" air space + 3/4" glass.

I know ideally the outer wall should be concrete or some such dense substance, but I'm not going that far. The siding will probably be 2 layers of 3/4" plywood with GG sandwiched between and then some appropriate covering over that.

There will be a room within a room construction with the inner part of the outer wall covered with 2 sheets of 5/8" drywall with GG. The outer part of the inner wall will be uncovered. The inner part of the inner wall will be covered with same as above. I'll use rockwool insulation.

My problem is finding enough data on the STC/OITC rating for such a thick glass double glazed laminated window to verify that it at least matches the wall in sound damping. Any opinions or suggestions on locating test data would be greatly appreciated!

Thanks,
Bruce

Hi Bruce, and Welcome!

My problem is finding enough data on the STC/OITC rating for such a thick glass double glazed laminated window to verify that it at least matches the wall in sound damping.

The best way to figure it out is to check that the surface density of the glass in each leaf at least as high as the surface density of the rest of the leaf, and the air gap between the two panes of glass is at least as large as the gap between the leaves themselves.

The density if two layers of 5/8" fire rated drywall is roughly 5 PSF. The density of 1/2" glass is roughly 6 PSF, and the density of 3/4" glass is roughly 9 PSF. From that, you should be able to figure it all out...


- Stuart -