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Roof Cleaning · FAQ

Roof cleaning FAQ

The common roof cleaning questions come down to five: what it costs ($0.15-$0.70 per square foot, roughly $255-$1,190 typical, per Today's Homeowner), which method is safe (soft washing — never a pressure washer on asphalt, per ARMA), how often (every 2-3 years for most homes), whether to DIY (no), and whether it lasts (no, recurrence is expected).

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This page collects the questions homeowners ask before spending money on roof cleaning. The theme running through the honest answers: the method matters more than the price, the results are temporary, and the job is more dangerous than it looks from the ground.

The most common way homeowners lose money here is not overpaying. It is underpaying for a high-pressure wash that strips granules and shortens the life of a roof worth many times the cleaning bill. ARMA's position on that is unambiguous and worth repeating to any contractor who disagrees with it.

Where the answer depends on your specific roof — warranty terms, contractor licensing rules, whether your shingles are algae-resistant — we point you at the document or office that actually knows. Manufacturer warranty terms and state licensing requirements vary, and we will not guess at yours.

How to choose

Method first, price second
Soft wash in writing. Then compare quotes. Doing it the other way round is how roofs get damaged.
Hire it out
NIOSH reports more than 100 ladder-fall deaths a year in the US. A treated roof is slippery. The savings do not justify it.
Expect regrowth and budget for it
ARMA says results are temporary. Today's Homeowner suggests every 2-3 years for most homes, annually in humid or tree-covered locations.
Deal with the cause
Overhanging branches and shade drive the whole problem. Trimming does more for the long term than any product.
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Roof Cleaning faq — common questions

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About $0.15 to $0.70 per square foot, or roughly $255 to $1,190 for a typical 1,700 square foot roof, per Today's Homeowner. Soft washing sits at the upper end, around $510-$1,275, and moss removal adds $135-$300 or more.
Not on asphalt shingles. ARMA states never to use a pressure washer on an asphalt shingle roof, because it causes granule loss and very likely premature failure of the roof system. Soft washing is the accepted method.
Today's Homeowner recommends every 2-3 years for most homes, and annually in high-humidity areas or where trees overhang the roof. Debris clearing should be at least annual, per EcoWatch.
We would not. NIOSH reports more than 100 people die each year in the US from ladder-related falls, with incorrect setup angle behind roughly 40% of incidents. Add a solution-slicked roof and chlorine handling. The typical professional cost is a few hundred dollars.
No. ARMA states the effectiveness of cleaning techniques is only temporary and discoloration will likely recur. Zinc or copper strips slow it, and algae-resistant shingles with copper granules are the durable fix at re-roof time.
Sources

Where these figures come from

You know more than the last homeowner they quoted.

That is worth something only while you are still choosing. Tell us what is going on and we will match you with a few roof cleaning pros whose licence and insurance we have already checked — free, no obligation.

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