John Sayers' Recording Studio Design Forum Archive

I found a knowledgeable one-stop supplier in the Seattle area.

R-Factor
16750 Woodenville Redmond Road
Woodenville WA

425.488.4888

They stock rockwool in various weights and thicknesses, RC, and Tremco brand 29 oz tubes of acoustic sealant ($5.50)

BTW...FYI...most of these companies, if you ask them they will give you a quantity discount. So if you buy a case (usually 12 tubes), it may save you .75 a tube or more.