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Probably is. No more luck with that than with sound board in general. I think I'll be okay with the gap I'm using. I notice some reduction in the noise from the neighbor's water heater already (calcium deposits, bang, bang, bang). Not that it can compare to my planer.

Thanks for the response, Joe. The panels are tan. No markings, just a little barcode sticker that says they were made in Canada. I saw what appears to be the same thing at Lowes. No ID there, either, other than "soundboard." The garage is already sheetrocked. I'll just be installing the...

I was given a sizeable stack of 1/2" sound insulation board, and thought I would attach it to my garage walls to cut down on power tool noise. I know it won't do a lot, but it was free... What I can't determine is whether an expansion gap is required between sheets. I assume lack of Google...