In this first picture it identifys a golf ball size blister.
How to repair foam roof blisters.
Cut the blister out using a razor knife bread knifes work the best.
Membrane roof cut away the membrane that has lost adhesion replace any wet insulation with like material and replace.
Inspect the damaged area for any moisture and continue cutting away damaged foam until only strong and dry foam remains.
There are a few ways a contractor will repair a blister.
Bitumen roof if the membrane is in good condition your contractor can simply cut an x shape into the blister to.
Use your polyurethane caulk to fill in the opening where the blister was removed.
With proper care and repair your foam roof can virtually last forever.
Phoenix foam roof repair.
Moisture trapped in spray down foam due to deterioration or loss of protective coating.
The polyurethane will need to cure before you seal the repair.
Foam roofs take a beating from our phoenix sun.
What to watch for roof coating blisters in ponding water areas are due to moisture permeation from above.