Can TPO be installed over an existing roof system?
It depends. If the existing roof is in good enough condition, a TPO membrane can beapplied over an existing roof system after an insulation board has been applied over anexisting built-up roof system or other single ply membrane. It is important to note thatthis is not always possible, and you may need to remove the existing roof beforeinstalling TPO membrane to get the best possible finished product.