Weighing the Merits of Spray-Foam Insulation
Scott Jacobs is facing a question many homeowners wrestle with: How to get the most bang for the buck as he weighs his insulation options.
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The 1,100-sq. ft. Cape has been gutted, and Jacobs has contacted three insulation contractors for bids on installing spray-foam insulation. Two recommend open-cell foam, the other suggests closed-cell foam. Closed-cell foam costs more, but it packs nearly twice the insulation value into the same space as low density open-cell foam.
In a post in the Q&A forum at GreenBuildingAdvisor, Jacobs looks for advice.
A key concern is whether using open-cell foam in fairly shallow rafter bays will allow Jacobs to meet energy code recommendations for his climate zone.
But is that essential? Not really, some posts argue. In fact, some claim, using more than a few inches of foam is a waste of money, and the codes themselves are written by office-bound experts rather than contractors.
That conversation is the topic of this month’s Q&A Spotlight.