Insulating 100-year-old Stucco
For Martin Halliday.
You assignment for me was to find out what was behind my walls.
To recap, I have an old stucco 4 square, where the previous owner put blown cellulose into the wall cavities.
I opened the access panel to the bathroom and pried off some lath that wasn’t removed from an early 60s remodel.
What I saw was the cellulose (expected) and some sheathing that appeared to be horizontally oriented. There was maybe a 1/4 inch gap between the two boards I saw exposed. I scratched a bit (gently) in that gap, and it looks like there is a second set of sheathing. I didn’t feel anything rough like the keys from the stucco. Its a tight space so I can’t view much.
If there is this sheathing and I can vacuum out the cellulose what reasonable options do I have? Seems like a trade of rockwool for the cellulose, buys me little other than some safety. No way I am doing closed or open celled foam. I would do EPS but it would leak like crazy. If taking the exterior walls down is on the table what does that open up for me?
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