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Originally Posted by iangomes  I'm just about to make some 4" panels and a few superchunks. Is 4lb/ft3 fine (rockboard 40) or would 6lb/ft3 (rockboard 60) be a better idea? I'm not going to frame them so if the 60 is much more rigid it seems I might have to get that.
thanks! |
Acoustically the 4 lb/ft^3 is better. Roxul makes several types of insulation at that density with various amounts of rigidity. You can probably find a 4 lb/ft^3 material that has similar rigidity to the 6 lb/ft^3 material.
Andre