Exterior insulation only?
I have a question about an old 1902 house with zero insulation. I am currently wrapping the exterior with two 2 inch layers of Poly Iso. the house has tongue and groove inside interior walls with dry wall over it. The exterior is cladding is wooden clap boards. I am going to airseal the existing wood clading with Zip system sheeting, tape all seams, add my two layers of staggered Poly iso foam, wrap with a house wrap (nonwoven) add my 1×4 strapping, and then the cladding. Should still put cavity insulation in the empty walls?I would need to do it from the outside and drill around the fire stops. Is this really worth it?
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