Direct answer
Properly installed foam is inert, doesn't settle, and doesn't degrade — it lasts the lifetime of the building. Workmanship warranty terms are set by your matched partner contractor; the foam material itself outlives the home regardless.
Authoritative sources
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
Energy Efficient Home Improvement Credit — up to $1,200/yr for qualifying insulation work.
Energy Star recommendations for attic and wall insulation R-values by climate zone.
Related questions
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