Flat Roof Leak After a Roof Cleaning Service — What Happened?

BERKELEY FLAT ROOF BLOG

Flat Roof Leak After a Roof Cleaning Service — What Happened?

Pressure washing and aggressive cleaning can genuinely damage an older or already-marginal membrane.

High-pressure cleaning can strip protective granules, force water under lapped seams, or stress an already-brittle membrane past its breaking point — especially on older modified bitumen or built-up roofs. A leak that shows up shortly after a cleaning service isn’t necessarily a coincidence.

If this happened to you, it’s worth having the roof inspected specifically with that timeline in mind — knowing when and how the damage likely occurred helps pinpoint where to look.

Leak started after a cleaning or pressure washing?

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