I have another question for you roofers out there. The roofers that are working said that they want to put insulation on top of the existing roof the just installed.
The roof is a modified roof that is already existing. They want to put insulation on top of the granulated.
My concerns are as follows:
The mater of adhesion with the winds of 150 mph hurricanes
The roof is a precast concrete roof. I am concerned that there will be premature roof failure at the joints as the concrete expands and contracts. Without the insulation there will be no ability for the roof to move separately from the deck.
That the 2 separate layers of modified roofing will act as a vapor barrier trapping condensation in the layer of insulation. Causing the insulation to deteriorate over time.
Any comments or opinions that any has on these matters would be greatly appreciated.