KISS, exterior wall insulating plan?
Problem: My recently painted 1920’s Craftsman in zone 5 has cedar lap siding over disintegrated asphalt paper over 3/4″ lap sheathing, 2×4 studs, no insulation, LOTS of ventilation.
Plan: From the inside, fur out the walls 2″, staple Tyvek against the inside of the sheathing and on studs, R21 Batting in bays then 1″ XPS and 1/2″ drywall onto studs. Simple right? Any foreseeable problems or alternatives with this?
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