Quote:
Originally Posted by waveheavy  But let's say I still want some kind of barrier between the rockwool and fabric. What would be OK to use in this situation? Some fabrics come with a kind of layered backing, which I think is still breathable. But what if I used a plastic barrier anyway? |
I wouldn't suggest anything like plastic because that would shift the absorption characteristics of the the ceiling absorbers that you are building from broad-band to a strange filter shape. Anyway, you said you want MAX absorption.
Try Dacron fiber. It is used in dress making and comes in thicknesses of 1/4 & 1/2". You can buy that at the fabric store too. Place it on top of the fiberglass before you install the fabric. --- But, IMHO, it is
not necessary.
But don't use a fabric with a layered backing or anything like that.. you need it to 'breathe'.
--- Ahhh, one sec! Automobile headliner! I used to use that for studio installs back in the 80s. It is fabric faced with 1/8" open cell foam backing. It's a bit pricey, but it works real well for safety and looks great.