SPF and Hurricanes

The track record for spray polyurethane foam (SPF) roof and wall insulation is long and positive. This widely specified and installed roofing and building enclosure system provides good insulating qualities and long-term building protection. It is relatively easy to build with, and effective in terms of first and life-cycle costs. Recent events, however, including several major U.S. hurricanes, have revealed the real value of SPF as a safe, sturdy and effective product that endures severe weather better than many other commercially available exterior systems. Severe weather is the toughest test for any roof system. When it comes to protecting roofs and walls against natural disasters, especially hurricanes, spray (or “sprayed”) polyurethane foam (SPF) roof and wall systems have shown remarkable resistance to high wind uplift and blow off, a characteristic attributed to its spray-applied application, strong adhesion, lack of need for fasteners and absence of joints or edges for the wind to grab onto. SPF roofing is resistant to progressive peeling failure due to missile impact, deck failure and peeling failure at the roof edge, not to mention preventing water infiltration following missile impact. In fact, laboratory testing of SPF systems found that the foam’s wind uplift resistance actually exceeded the capacity of UL (Underwriters Laboratories) Test equipment over concrete decks.
Assembly Flashings Attachment Projectiles Wind Water
MEMBRANE ROOFING Overhangs, overlaps seams and joints Attached flashings Secured to deck with fasteners Subject to damage and penetration Can lift off or peel under high wind Peeling exposes building to water intrusion
Continuous surface with no edges, seams or joints Self-flashing Self-adhering (adhesion without fasteners) Resists missile damage and penetration Grips building wall to resist high wind Continuous surface protects against water intrusion
Don’t let this happen to you.
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