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Existing Roof:TPO or PVC?

9.1K views 3 replies 4 participants last post by  RooferJim  
#1 ·
When inspecting an existing white single-ply roof, how can you tell if it is TPO or PVC? Or niether?

The roof I am specifcally thinking of that brought up this question is an older HPG roof over foil faced ISO. It is discolored.