[rxfit06]

I have a few pieces of duct board(compressed fiberglass with foil backing) and am thinking of building a panel to hang over the drum kit. A couple of questions:

I read on here that 2" thick is usually a minimum thickness to consider. Since my pieces are 1", I will be stacking 2 of them. Should the foil backing on the 2nd piece(the one added for thickness) be facing towards the mics/floor, or should I have the foil backing facing the ceiling? To that end, would a 1" panel be just as effective if this is only used for taming comb filtering?

Any specific recommendations for the physical mounting of this on the ceiling?

Do I need to put a wooden back on the panel, or just leave it as is?

Thanks