Direct answer
Closed-cell foam: R-7 per inch + air barrier + vapor barrier. Fiberglass: R-3.5 per inch + no air seal. Cellulose: R-3.7 per inch + minimal air seal. Foam outperforms both per inch and as an air barrier.
Authoritative sources
- US Department of Energy ↗
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
- IRS Section 25C ↗
Energy Efficient Home Improvement Credit — up to $1,200/yr for qualifying insulation work.
- Energy Star ↗
Energy Star recommendations for attic and wall insulation R-values by climate zone.
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