Spraying Polyurethane Foam over an Existing Roof

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Spray foam isn't just used for insulation — it can also be used for roofing

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When Taya and Stephen Shoup's old tar-and-gravel roof began leaking, the couple hoped to find a replacement roofing that would be energy-conserving, leakproof, cost-competitive, and reasonably green. As the house's roof sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. doubled as a finished ceiling, the old insulation was scant. They broiled in the summer and hemorrhaged money during the heating season.

URL: http://www.greenbuildingadvisor.com/blogs/dept/guest-blogs/spraying-polyurethane-foam-over-existing-roof