Spray Polyurethane Foam (SPF) roofing is valued for its insulation and waterproofing qualities, but it can be vulnerable to UV degradation if left exposed. UV rays break down the foam’s outer surface, causing chalking, discoloration, cracking, and eventually, loss of protective properties. This degradation happens because SPF is a petroleum-based product, and without a protective coating like elastomeric paint or silicone, continual sunlight exposure rapidly deteriorates its structure. Simple diagnostics can begin with a close visual inspection for chalky residue or crumbling foam surfaces. You might gently rub a dry cloth on the surface; if the cloth picks up white powder, that’s a sign of UV breakdown. However, avoid walking on the foam or applying water until your coating integrity is assessed, as damaged SPF can absorb moisture and lose effectiveness.
For a safe DIY check, first, look for areas where the protective coating might have worn off, especially on flat roofs or areas exposed to direct sun. If you notice damage or significant chalking, it’s a good idea to contact a roofing professional who specializes in SPF. When speaking with a contractor, ask whether they will remove old coatings before applying new ones and what type of UV-resistant coating they recommend. Also, confirm if the spray foam warranty remains valid with their proposed repairs and coatings, as improper work can void manufacturer guarantees. Addressing UV damage promptly helps maintain your roof’s insulation and waterproofing, preventing costly repairs later.