Invictus was called out to this condominium complex in Southern California, to investigate a minor roof leak. What we found was a flat roof system that had an original PVC roofing material, covered by a waterproofing membrane. After some research, we discovered that the original PVC was installed over 20 years ago, and the membrane was installed over 5 years ago, in order to extend the life of the roofing system. At the time of membrane installation, according to some owners, it appeared that the membrane had achieved adequate adhesion to the PVC. However, it only extended the life of the roof by 5 years. More research needs to be conducted to prove or disprove the claims that a membrane over PVC is a viable solution. We recommended a complete removal of the PVC roofing, and installation of a TPO single-ply roofing membrane.
When a PVC roof has reached the end of its life, it must be disposed of, NOT covered up.