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Old 22nd January 2008
  #10
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Quote:
Originally Posted by AnAverageJoe View Post
What do you mean by STC rating?
Sound Transmission Class - It's the amount of sound attenuation between 125hz and 4000hz. We know that these frequencies are easy to tame and the bass is what is the hardest.

We sealed the cement slab, put down a heavy mil vapor barrier, used the U-boats under the joists and filled the cavities with conduit, sand and rockwool. We then put down 2 layers of 3/4" hardwood sheets at 90 degree offset with green glue in between. On top of that was 1/4" rigid fiberglass and then a floating laminate 3/4" Bellawood flooring.

We got the "Roxul" rockwool at R-Factor in Woodinville, Wa We used 250 bags!

Regards,
Bruce