Sprayed Polyurethane Foam (SPF) is not a waterproofing material. When installed correctly, with a heavy waterproof coating and a slight pitch, it does “shed” water. However, SPF foam has millions of small holes called air pockets created at the time of installation. These holes give SPF its insulating properties. As the coating breaks down and allows water into the system the moisture is trapped and causes seepage. We do not suggest spending money on yearly coatings. It is advisable to save funds and replace the SPF roof with a certified roofing system.