Direct answer
Closed-cell foam is non-porous and doesn't absorb odors. Open-cell foam has slight porosity but is closed-cell adjacent in real-world performance. Smell concerns usually trace to the brief curing period (24-48 hours), not long-term.
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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