Fiberglass vs. Rockwool Batts
Is there any advantage to spending more on Rockwool batts if I already have thick exterior insulation?
Zone 7 Northern Wisconsin new home build…
I have 2×6 walls with 5″ of Rockwool comfortboard exterior insulation, rainscreen strapping, cladding.
I am running way over budget on my project and wondering if I can opt for fiberglass batts in the 2×6 wall or if there is really any advantage to Rockwool batts or dense-pack cellulose given that I have a 5″ blanket of exterior insulation?
I understand there are benefits to Rockwool and dense-pack from a windwashing perspective and in terms of getting a tight-fitting batt, but isn’t all that pretty marginal once I have a solid surround of exterior insulation?
Wondering if it is still worth the extra cost or if this is a good place to save some money?
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