Open-cell spray foam wall assembly in Zone 5A
I am currently in the design phase of a small home, 50 miles north of Philadelphia, Pa, Zone 5A. The home will be a single level, 1248sq feet, with the following wall assembly…
exterior siding, Hardie
Open Cell spray insulation
The roof is a fully vented attic.
I have read many articles discussing the potential issues with Open Cell spray insulation being used in a roof assembly in Zone 5, however, I am still uncertain if those same issues are an equal concern when used in a wall assembly in the same zone 5. Should I have the same concerns using Open Cell spray insulation in the exterior walls? Will it limit drying to the inside? or would it be considered a safer wall assembly using Rockwool insulation?
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