I wish I could get a real quick answer on this cause I have today to get this stuff. But I found some 705 FRK which is foil faced. Can I use that and which way should the foil face, if I can. thanks
> Can I use that and which way should the foil face <
It depends on how you plan to use the fiberglass. For bass traps that straddle corners, the foil is useful and it should face toward the room. For mid and high frequencies, or bass trapping flat on a wall a few feet behind you, the foil is not appropriate.