Yes, if the wrong method is used. Full-force pressure washing can strip the protective granules off asphalt shingles and drive water under flashing and shingle edges. Fort Lauderdale Pressure Washing avoids that by soft washing roofs — low water pressure combined with a cleaning solution that kills algae and mildew without blasting the shingle surface.
What does the damage actually look like?
Granule loss is the main one — those small granules protect the asphalt underneath from UV and weather, and once enough are gone, that section of shingle ages faster and can start leaking. High pressure can also force water up and under shingle tabs and flashing, which doesn't show up as a leak until well after the cleaning, when it's harder to trace back to the cause. Tile roofs carry a different risk — direct high pressure can crack or dislodge individual tiles.
So how does soft washing clean the same roof without doing that?
Instead of relying on force, soft washing uses a cleaning solution at low water pressure to kill the algae and mildew causing the staining, then rinses it off gently rather than blasting it. Nothing is hitting the shingle or tile hard enough to strip granules or lift edges. It's slower than running a pressure washer across the same area, but it's the method that doesn't put the roof at risk to get the stains off.
Will the black streaks just come back afterward?
The streaking is algae growth, not surface dirt, so a method that only rinses the visible growth off the top tends to see it return quickly. Soft washing kills the growth rather than just knocking it loose, so the roof stays cleaner for longer — though nothing keeps algae from eventually reestablishing itself, since spores travel by wind and rain regardless of how the last cleaning was done.
Can pressure washing void my roof's warranty?
It can — many shingle manufacturers specify against high-pressure cleaning because of the granule loss it causes. Soft washing is the method built to avoid that problem in the first place.
Is soft washing safe for tile roofs too?
Yes. Low pressure avoids the cracking or dislodging risk that comes with aiming a pressure washer directly at tile.
How do I book a roof soft wash?
Call or request a quote through Fort Lauderdale Pressure Washing during business hours, Monday through Saturday, 8:00 AM to 5:00 PM, and the crew can look at the roof before scheduling anything.