Direct answer
Yes, drill-and-fill. We drill 2-inch holes between studs, inject closed-cell foam (or pour-in cellulose for budget jobs), and patch. About 90% as effective as open-wall foam at 60% of the cost.
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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