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post #1 of 2 Old 10-12-2011, 09:17 PM - Thread Starter
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I'm about to start building backer boxes for my electrical outlets, switches and can lights and I've gotten to thinking about the 25 gallons of green glue sitting in the corner of the basement...

I think I understand the principles of CLD fairly well but when I envision 2 small pieces of 1/2" OSB (or cement board, or whatever) fastened together with several screws, how is this NOT behaving like a single layer?

Simply g-glueing 2 layers together (without screws) makes sense to me.

Tightly fastening the 2 layers together with screws would seem to defeat the viscoelastic properties of the material between them.

Can someone fill me in on what I'm missing?
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post #2 of 2 Old 10-13-2011, 06:36 AM
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The only thing is that GG is not a GLUE it is a GOO that wasn't designed to hold anything together. Just build your boxes with the minimum number of fasteners. Secure the outer shell edges with fasteners, you can probably just GOO the inside layer if you cut the pieces so that they can be snugly friction fit into place. Also use accoustical caulk on the seams.
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