Materials / Spray Polyurethane Foam (SPF) Roof

Spray Polyurethane Foam (SPF) Roof

fluid-applied

A seamless, fully adhered low-slope roof system created by spray-applying polyurethane foam directly to the deck, then protecting it with an elastomeric topcoat (acrylic, butyl, silicone, polyurethane, or polyurea). The foam provides insulation and slope-to-drain in the same application; the topcoat is the wearing surface and is re-applied every 10 to 20 years to renew the system. SPF assemblies are evaluated for hail under FM 4470 (moderate-hail and severe-hail ratings).

Category family

fluid-applied

Typical lifespan

20–40 years

Typical wind resistance

Fully adhered with no mechanical fasteners; IBHS-cited testing on structural concrete decks shows tensile adhesive failures at approximately 900 psf

Cost band

$$$

Slope suitability

low

Typical warranty

10–20 years

Pros

seamless and fully adhered, with no fasteners or seams to fail
adds insulation and slope-to-drain in the same application
hail and wind-driven debris damage typically does not cause the roof system to leak (IBHS)
minor surface damage is field-repairable with caulk
renewable system; recoating restores the wearing surface

Cons

topcoat is the wearing surface and must be re-applied every 10 to 20 years
fire performance is assembly- and topcoat-dependent (assemblies rated Class A, B, or C under ASTM E108 / UL 790)
spray application is weather-sensitive and installer-dependent
low-slope use only

Sources

ibhs.org verified 2026-07-17

Spray Polyurethane Foam (SPF) Roof

Manufacturers

Named products

Related guides

Sources