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Originally Posted by Wormius
So we found some old pink insulation along an exterior wall that looked like it had some mold, it is discoloured, but not looking wet or otherwise horrible. Outside of house, stucco looks kind of damp. Anyway, the weird thing is, contractor thought we should put some vapor barrier along the interior-facing sheathing inside the house, then new insulation, then vapor barrier, and finally drywall.
This seemed kind of insane to me, and I suggested we just do everything the usual way and we’ll investigate the issue from the exterior side in the spring or summer.
Am I off-base here? I have never heard of putting vapor barrier over the sheathing inside the house, but it sounds like a bad idea that could make things worse, especially if we can’t get around to addressing the issue right away. And I don’t even know if it was just an old problem that was already remedied. Just wondering if it was reasonable to dismiss the suggestion or if this is an accepted way of dealing with this.
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You’re perfectly on base. That’s a terrible idea. You don’t want to be trapping moisture inside the wall cavity by having vapour barrier on both sides. I’d be getting a new contractor too if that’s the kind of advice you’re getting. That’s like a mechanic telling you to put sugar in your gas tank to take care of some knocking in the engine.