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1960 homes in coastal California (climate zone 3C) (95062). Single level at 1263 SF.
We are preparing to insulate our exterior walls and have discovered that our sheathing appears to be a 5/8″ gypsum product. It is covered by black paper which I assume to be some type of asphalt. After this, we have wire mesh and then stucco.
I had originally thought the house had no sheathing so I’m relieved to see something. Still, here in California, I’m used to seeing wood sheathing.
Any issues with just throwing batts into this assembly? I am very concerned about insulating an old house and causing moisture problems. Anything extra I can do to prevent moisture – perhaps caulk all the seams in the sheathing from the inside?
Thanks!
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