Direct answer
Yes, but coordinate with neighbors and HOA. Walls between units typically have STC (sound) requirements that closed-cell foam helps meet. Get HOA approval; some condos restrict foam due to fire-code interpretation.
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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