A foam roof is 1–1.5 inches of closed-cell spray polyurethane foam, sprayed as a liquid that expands and hardens into one seamless slab, under a thin elastomeric or silicone coating that takes the sun. It is a roof and the insulation in one layer.
Different products. Roofing foam is dense, closed-cell, sprayed outdoors and coated. Spray foam insulation is sprayed inside walls and attics and is never a roof surface. If you searched "spray foam roofing" and meant attic insulation, you want an insulation contractor.
The coating chalks and thins; birds peck; blisters form over trapped moisture; scuppers clog and water ponds. All of it is coating-level and repairable. Repair → · Recoat → · Lifespan →
Flat and low-slope roofs in hot, sunny climates — above all the Phoenix metro, where it has been the default since the 1970s. Foam roofing in Arizona →
Yes — the foam is closed-cell and seamless, and the coating sheds water. Leaks come from coating failures (pinholes, splits) rather than the foam itself.
Yes, carefully. Use walk pads at HVAC units and avoid sharp heels; foot traffic is a common cause of coating damage.
The surface is cleaned and dried, foam is sprayed in lifts to the specified thickness, slope is built up toward drains, and the coating is applied in two passes once the foam cures — typically one to three days for a home.
LAST REVIEWED 2026-11-01 · Prices on this site are published Valley rates and estimates, not a quote.