Vapor Barrier: existing gypsum sheathing in Texas
First, thank you all for the incredible information you all share on this site; I am a big fan!
My 1978 house is in The Woodlands, TX; just north of Houston and is mostly constructed with brick veneer, a 2″ air gap, gypsum sheathing and 2×4 framing. The house does have portions of cedar/cypress board siding. I have Heating, A/C +D with an UltraAire dehumidifier ducted to the system.
We still have a humidity problem during the summer. Aside from the walls, its known the ducting is leaky too.
What I would like todo is to add insulating sheathing and an air barrier to the walls and attic (not currently conditioned space, want to keep roof ventilated). I am already going to gut the interior side of the walls to patch any holes in the sheathing.
Ideally I guess, i would go through the exterior side of the wall but that would be crazy with removing the brick veneer. So how can this be done if possible from the interior side?
Thanks in advance!
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