Caution
Ponding is water that stays on the surface after rain. LABC Warranty says a flat roof should drain freely, so standing water is a fault to fix, not a feature of the roof.
Small, unchanging blisters are often cosmetic. Blisters that grow, split or form in clusters have trapped moisture under them and should be cut out and patched.
Before anyone cleans, drills or scrapes an old sheet garage roof, find out what it is made of. Asbestos cement was common on garages built before 2000.
A leak inside a bay usually comes from the small roof above it, most often where it meets the house wall. A roofer checks the flashing and the surface, not the window.
Describe the job and get a fixed price from a local roofer.
