Need a bit of advice. We have a run of that plastic sheeting for a cold return in our basement ceiling. Above it is our powder room which is kind of in the middle of the floor (as in you can walk around the outside). The outside wall of the powder room above the cold air return has a light switch and receptacle collects a tonne of dust around the plate and inside the boxes which leads me to believe there’s a vacuum going on inside the wall attracting the dust which probably means the cold air return is leaking air through the floor from the wall cavity above.
I will take it all down to look for the leak but what do I seal it up with? I doubt that foil tape will hold against the wood subfloor or joists, can I use Tuck tape?
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