Zip R over existing sheathing
In the planning stages of building an addition and using Zip R Sheathing. While building the addition we are considering replacing the siding and windows on the existing house. Question – Is there a risk of potential damage of the existing wall assembly if the Zip R product is run over the existing sheathing to mitigate air leakage and improve R value on the existing walls? Existing – 1940’s construction, 1/2″ plaster board interior, 2×4 stud, blown in cellulous (1980’s) 3/4″ board sheathing exterior. Steam Heat. Zone 5 one town away from Zone 6.
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