Originally Posted by oldognewtrick
That's what I would do. Be carefull cutting into any roof membrane, but the big question is why is there a bubble to begin with? Patch that area, but also inspect the area around it and any penetrations for seperation of the membrane or flashings.
Well, the large blisters have mainly formed over my Arizona room. There
are only some very small blisters over the main house.
And because the Arizona room is not directly air conditioned (there
was previously a wall unit that was removed), I assume that
the heat build-up in this room must be partly to blame for these
blisters. The problem with leaving the blisters, and just re-coating,
is that the blisters allow the rain pools to form (as you see in pics),
and so will probably encourage the blisters to perhaps get even
larger, assuming they are due to moisture getting under the top layer
and vaporizing due to the heat.