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Post by Ethan Winer on Jan 30, 2017 20:15:35 GMT
Wow, I really don't know which would give more isolation. I'll guess more mass and less air space with insulation, as long as there's some air and plenty of insulation. But I don't know how to tell which is better other than to build both ways and measure. Which obviously isn't practical.
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Post by rock on Jan 30, 2017 21:32:57 GMT
I'm pretty sure the correct answer is 12" of insulation for M-A-M from Rod's book. So if I understand correctly, your concrete ceiling and walls will be your first layer of Mass, your 12" insulation will be your "Air" and your drywall (probably 2 or 3 sheets thick) will be be your second Mass layer. Since the "room in a room" is isolated, you don't need resilient channels. Walls are the same. Check the book but I think this is right.
One other detail in Rod's book is to use compressed mineral wool under the sill/bottom plates for isolation of the room in a room. I remember seeing it in a diagram. Since your framing is built, it's probably not easy but if you can jack up the frame one wall at a time, maybe you can still get it in there. A long as you're at it, it's worth a shot. The 12" of fluffy is what I believe Rod would recommend.
Cheers,
Rock
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