John Sayers' Recording Studio Design Forum Archive

I'm planning on building my own window treatments for my control room and it seems pretty simple (I read Rod's book) I just have one question. What could I substitute the fabric wrapped rigid fiberglass trim separating the two pieces of laminated glass with? If I'm not being specific enough....You have your laminated glass, the inner wood stop, the fabric wrapped rigid fiberglass, the inner wood stop, and the other piece of laminated glass. What else could I put in the middle if anything?

Thanks,
-Barrett

Anything that is "soft" and will not flank, basically.
The reason for the cloth wrapped insulation is that is covers the gap so no bugs can crawl up the space.
Put anything in between the gap that will not "connect" the two frames or else you'll end up having a weakspot.

Is there anything you would recommend? I was thinking like a dense felt but I'm not sure if I could find this easily.

Take one piece of 1x1" lumber, strapple fabric on it. then attach another piece of lumber on the other side. Nail one, then stretch the whole thing and there you go

I'd buy a few Sponge-Bob action figures and stuff them in

What I did was seal the gap of the framing with shower pan liner, then fabric wrapped 703, expressly as Rod describes.

I had a pretty difficult time getting all of the pieces in place by myself. Trying to hold two 4ft fabric wrapped side pieces of 703, an 8 ft fabric wrapped 703 top filler, the top finish window plate and screw it all into place was a PITA I'll never forget....

If your window is fairly large, or you gotta do it by yourself, I def recommend sealing the air gap with the shower pan liner and doing what jbassino recommends... except, I'd stick a narrow filler piece of 703 or mineral wool in there. Just in case the fabric should ever let go, with the filler piece, at least it wouldn't sag.