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Dean Sandbo | Posted in General Questions on

Existing 4″ concrete poured floor over basement living space. Was planning on putting down 6 mil rubber, then two layers of 1/2 advantech t&g. Hardwood floors on top of that. Want to decrease ipact sound transmission so the rooms in the basement down below. I know I should loose lay the rubber down.. Im just not familiar with expansion and contraction of plywood. Should I glue and screw the two layers together? Or should just Screw. I was also thinking of green glue between the two layers of advantech.

1. Does this seem like a good solution?
2. Should I glue and screw the two layers together?
3. Would green glue between the layers be a good option? Or maybe another layer of thin rubber?

Thank You for your consideration!

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  1. Expert Member
    Malcolm Taylor | | #1

    On the face of it yes it sounds good. However sound attenuation is a tricky thing. The parts don't always add up to a whole. Certain components can actually make the assembly less effective when placed in the wrong relationship with the others. The only way to predict how all the materials will actually work when put together is to use an assembly that has been rated. A quick Google search will yield a number of good rated assemblies for concrete floors. That's where I'd start.

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