I'm not a builder, but I've seen builders use a
product called BITUTHENE (pronounced bitch-a-thane)
for a roofing underlayment, over concrete in
foundations, and other places.
Does anyone out there know if this stuff might work
for the sound deadening? I know Bituthene has various
products, all somewhat similar.
Seems like it might be cheaper too?
Thoughts????

Brian Butler