Last year I had a flat roof replaced on my house. The flat is approximately 15’ x 12’.
The contract was setup to install 2-ply bitumen membrane (granular top) and 3/16" Protec board.
I just gutted the ceiling under the flat and can see the membrane through the wood planks. I do not see any evidence of this Protec board.
Can someone please help me understand how this is installed. Do you normally install membrane then protec board then membrane again?
I am confused and worried I am getting ripped off.