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Full services directory How it worksFor prosAbout Get matched Call (866) 582-8523If you found this from pressure washing, pause: roofs are cleaned with low pressure and chemistry, not a driveway wand. Here is the short version — then the roof-cleaning specialists who own the full guide.
This page covers roof washing as part of a pressure washing project. For the full guide — every option, the complete process and detailed pricing — see our main roof washing guide.
Roof washing removes algae, moss and lichen from the roof surface. On asphalt shingles the accepted approach is low-pressure soft washing: solution does the work, water only rinses. High-pressure blasting strips protective granules and can void manufacturer expectations. If a pressure-washing crew offers to "do the roof while we are here" with the same wand used on your driveway, that is the wrong method in the wrong trade context.
Identify roof material and condition first
Asphalt, tile, metal and wood want different chemistry and access. A roof near end of life may be cleanable in theory but too brittle to walk.
Watch for: A same-day add-on quote with no roof inspection. Height, pitch and material decide whether the job is even safe.
Apply soft wash at low pressure — never driveway PSI
Cleaning solution is applied gently so it dwells on the growth. The rinse stays low-pressure. This is the opposite of flatwork surface cleaning.
Watch for: Any wand technique that looks like house or driveway pressure washing aimed at shingles. Granule loss is cumulative and hard to see on day one.
Protect plants and gutters as part of the roof job
Runoff from roof chemistry hits landscaping and fills gutters with debris. Roof specialists plan plant protection and gutter clearing into the visit.
Watch for: Wall crews who treat plant care as optional because their usual job is siding, not roof runoff volume.
Roof washing is priced by roof size, pitch, material and access — not as a cheap add-on to a house wash. Multi-storey and steep roofs cost more because of safety setup. Full ranges live in the roof-cleaning and cost guides for that trade.
See the full roof washing cost guide — by material, size and region →
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