What kind of energy savings can I expect with 2″ of rigid foam?
I live in Zone 4A, the house was constructed in 1968. 2×4 walls with unbacked yellow fiberglass. Interior has paneling over drywall (it was built that way). Exterior is 3/4″ plywood with a foil backed paper and polystyrene filled aluminum siding.
I’m having the siding removed and replaced with 2″ of foamular and Certainteed vinyl siding. Can I expect anything dramatic in terms of energy savings?
I’ve already had 12″ of cellulose blown into the attic space over the 4″ of fiberglass, had the basement block walls and rim joist filled with CFI corefoam, and had all the windows replaced with low-e double paned argon glass.
Thanks for any comments or suggestions.
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