Single ply systems (TPO and PVC) have become more popular over recent years due to their simplicity of installation and repair. They are a great flat roofing system option for homeowners whose homes are designed with low slope roofs. Single ply membranes are highly reflective, light weight, economic, and resistant to the presence of chemical materials such as acid rain. Single ply membranes can go directly over an existing roof without causing strain on rafters and joists due to its relatively lightweight properties. TPO and PVC roofing membranes can also be installed over polyisocyanurate insulation (used as a coverboard to obtain a smooth surface) to add more R-value to a home thus reducing energy costs even more. Aftermath Roofing applies their commercial experience with single ply membranes to residential projects and ensures a high quality installation.