Due to the fact that SPF is applied as a liquid, it is seamless and self-adhering with no fasteners required. This versatile installation method allows it to conform to tight and awkward spaces on the roof. SFP roof systems are waterproof, resistant to hail and wind damage and provide the highest R-value (the measure of resistance to heat) of any roofing material. SPF roof systems can be customized to fit particular drainage requirements. Adequate drainage is particularly important in these systems because of their natural sensitivity to water.