I haven't managed to remove all the fresh air vents after converting to mechanical ventilation, but now I have a room where I really need to fix an old vent on the inside because I'm building over it. How do you do this correctly?
The wall looks like in the pictures below. A chipboard with black plastic behind it. Should I just leave the insulation in place, remove a bit more chipboard, tape new plastic, and then cover it with drywall/OSB? The vent is still on the outside, but I'll take care of that next summer. Will it work, I wonder?
This part was built in '79 and has a vapor barrier both in the ceiling and walls, as far as I can see from the old black thicker plastic. I went ahead and taped new construction plastic there, it should work well.
Foam sealant is hardly diffusion-tight, right? Or is there such a thing that is?
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