Spray foam roofing (SPF) is a popular choice for its excellent insulation and seamless application, but it isn't immune to leaks, especially in roof valleys where two roof planes meet and guide water into gutters. Valleys are prone to leaks because they collect more water and debris, putting extra strain on roofing materials. In SPF roofs, leaks in valleys often happen due to damage or wear of the protective coating applied over the foam. UV rays, weathering, or physical damage can cause cracks or thin spots in this coating, allowing water to penetrate into the foam and seep into the structure below. Diagnosing valley leaks yourself starts with a careful roof inspection, particularly after a heavy rain. Look for soft spots, discoloration, or pooling water. Inside, water stains on ceilings or near valleys can be clues. Check that the protective top layer is intact and not peeling or cracking. Keep an eye out for clogged gutters or debris in valleys that block water flow, as these can worsen leaks.
Simple DIY checks include gently probing the SPF surface in valleys with a small stick or screwdriver to detect softened areas, but avoid damaging the foam further. Make sure gutters and downspouts are clear to prevent standing water. However, since SPF roofing requires careful handling and specialized repair materials that must meet warranty conditions, it's important to call a professional roofer with SPF experience as soon as you suspect a leak or damage. Ask your contractor how they will assess valley integrity and whether they use compatible coatings that maintain your warranty. Also, inquire about their process for blending repairs smoothly into existing foam to avoid weak spots. This ensures your valley repair is durable, leak-free, and keeps your SPF roof protective and energy-efficient.