|Forum topic by ADHDan||posted 82 days ago||532 views||0 times favorited||4 replies|
82 days ago
My shop is a 11’x17’ lower-level room in a split-entry house, directly under the kitchen. I finished the interior walls with two layers of drywall and Roxul insulation, which has provided good sound dampening in the adjacent downstairs rooms.
Now, I’d like to try to do some soundproofing to muffle the noise upstairs but I have two issues. First, there’s a HVAC vent duct running the length of my shop along the ceiling. Second, the shop ceiling is unfinished (exposed joists) and for various reasons I really don’t want to drywall it.
So, I was thinking of friction-fitting Roxul between the joists (without drywalling the ceiling) to provide at least some sound barrier, while still allowing access to all of the plumbing, HVAC, and other lines in the ceiling (and to allow me to continue using the exposed joists for hanging storage). Likewise, I was thinking of wrapping the metal HVAC duct with Roxul, roughing in some hanging supports to hold the insulation in place.
My questions are:
(1) Is there any better/more efficient way to soundproof the ceiling without drywalling everything (and for roughly the same cost as the Roxul)?
(2) Does Roxul make a batt with a surface cover that would be code compliant for an exposed-joist ceiling? I spoke with a contractor friend who said that if I don’t drywall the ceiling, I should use batts that have some sort of fire-resistant surface on one side so that they don’t immediately turn into a tinderbox in a fire situation.
(3) Is there any better way to soundproof the metal duct than covering it with Roxul?
-- Dan in Minneapolis, woodworking since 11/11.