Yes, TPO (Thermoplastic Olefin) roofing can be installed over an existing roof system in some cases. However, there are several critical factors that need to be considered before making this decision.
First and foremost, the existing roof must be structurally sound and able to support the weight of the new TPO roof system. This means that any moisture or damage in the existing roof must be addressed before installation to prevent issues with the new roof.
It's also important to consider local building codes and regulations, as some areas may require the removal of the existing roof before a new one can be installed.
When Paradigm Roofing is asked to install TPO over an existing roof system, we will not blindly say "yes." Our team of experts will need to do a thorough examination of the existing roof system before making a recommendation that we can stand behind. For example, if the current roof system is a built-up roof system or another single ply membrane such as PVC or EPDM, we might require the installation of an insulation board before applying the TPO membrane.