Vapor-permeable barriers and brick walls (MemBrain, Intello+, etc.)
I have a ~100 year old solid brick house in zone 5 - Northern IL ~1/2mi to Lake Michigan. The walls are 2+ courses wide with ~1" gap between.
We're slowly rehabbing the house floor by floor. And trying to decide what the best way to deal with air infiltration and vapor permeability. From my reading, it looks like I could put Membrain or Intello+ on the brick directly, then build a (non load bearing) studwall on the inside and insulate that.
Is there a problem with putting a variable perm barrier on a cold surface? .
Any reason to spend the extra on Intello? It seems like the main advantage of Intello is it's greater strength for installing densepack insulation. We plan on using Roxul for the DIY and so the strength is a moot point.
(Yes, I know I could build air-tight drywall, but for $200 per floor to avoid sealing metal electrical boxes and rigid conduit seems well worth the cost.)
The only wall exposed to rain is the east wall. (north/south are close enough to other houses and gutters, etc that there's minimal possible rain reaching the brick. The west wall is face brick - glazed and so less moisture loading.
Posted Jun 22, 2014 2:52 PM ET
Edited Jun 23, 2014 4:23 AM ET
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