Spray foam doesn’t settle, sag, or degrade like fiberglass and cellulose. Properly installed foam lasts the lifetime of the building (50+ years). Workmanship warranty terms are set by your lead technician and confirmed in writing before work begins.
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Spray polyurethane foam is a thermoset plastic that polymerizes in place during the chemical reaction at install. Once cured, it does not decompose under normal indoor conditions; testing of foam installations 30-50 years old shows minimal property degradation. The two failure modes that can shorten effective lifespan: (1) UV exposure (foam degrades when exposed to direct sunlight, so any exterior application requires protective coating), and (2) moisture from a chronic leak (water itself does not degrade closed-cell foam, but persistent water against open-cell can cause matting). Most Cincinnati installs are interior or under-roof-deck where neither risk applies. Manufacturer material warranties on Demilec, Icynene, and BASF products are typically 25 years. Workmanship warranties from credentialed Cincinnati installers run 1-10 years depending on our technician; the foam itself outlives the building regardless of paper warranty length. Cincinnati real-estate-time-horizon context: for homeowners planning to stay in the home 10+ years, foam pays back in utility savings during ownership and adds resale value at sale. For shorter-tenure homeowners, the resale value at sale is the dominant economic factor. Cincinnati MLS data shows foam-insulated homes selling 6-10 days faster on average and at modest sale-price premiums versus comparable unfoamed homes.