From: Stephen Foster <oncourse@i...>
Date: Mon Jan 8, 2001 12:50 am
Subject: Re: [acoustics] Re: OSB vs Gypsum?
ROOFING FELT!! Sounds absolutely logical. I'm gonna try it on a gobo and
see. As soon as I get time. *S*
>--- In acoustics@e????ups.com, richardplourde@m... wrote:
>> --- In acoustics@e????ups.com, Stephen Foster <oncourse@i...> wrote:
>> > Mass is mass. Mass is good. Mass is our friend.
>> Well . . . let's not forget damping. People have, over
>> the years, made some fairly massive bells.
>Aaahhhhh a relief! Someone with total sence! You go Richard!
>One of the things I have found extremely effective in "layering", is
>to use roofing felt in between layers of material. No matter what
>kind of material(s) you use, it sharply increases efficiency.
>Get the thickest type available, like AST 30. At about $10 a roll, its
>very cheap. Most effective is to glue one site to the wood using
>contact adhesive(one site only and do that outsite, or you'll get as
>stoned as hell, followed by a huge headache...). Why does this work
>so well? Roofing felt is paper, impregnated with bitumen. Bitumen is
>one of the most effective damping compounds, especially good for low
>For the same reason, a combination of a thick construction ply (4 or 5
>ply, 3/4") and fire rated drywall is very effective. Ply is made by
>gluing layers together under extreme heat, using a bitumen compound.
>This combination (ply / drywall)is very effective over a much larger
>frequency spectrum than 2 layers of the same drywall, especially in
>the lower frequencies.
>One of the most cost effective, "sandwiches" I've ever made consisted
>of 3/4" ply, glued AST 30, 1/2" soundboard and fire rated drywall.
>For more info, unsubscribe, large file uploads, ect: http://www.studiotips.com
>Send small drawing files to dan@s...
>To Unsubscribe: Send email to
MillKids/Howler Studios/MFoV Info
all music. all indie.