Illustration for Roof Cleaning and Your Shingle Warranty

Here are the five lines neighbors, roofers and washers repeat most, held up against what the trade group and makers publish. If you’re still deciding whether to clean at all, start with is roof cleaning worth it.

Claim: roof cleaning voids your shingle warranty

What you’ll hear. Touch those streaks and your coverage is gone.

What the record shows. The asphalt roofing trade group’s algae guide walks through a bleach-and-water wash, so cleaning itself is expected. The one full shingle warranty we read, a shingle maker’s limited warranty, has no clause ending coverage because a roof was cleaned. It does exclude damage from “any traffic of any kind on the roof” and from chemicals on the shingles. So the wash is fine, but damage a crew does up there isn’t the maker’s to pay.

What it does to the price. A soft wash keeps you inside the rules. One company’s rate card runs $0.30 to $0.45 per roof square foot, with a $549 minimum. On a 2,000 square foot roof, that’s 2,000 × $0.30 to $0.45, or $600 to $900.

Claim: the algae warranty will pay for the whole cleaning

What you’ll hear. Some washers pitch it as free money: the maker covers black streaks, so the maker pays.

What the record shows. Partly true, on the right shingles. That same maker says that in the first year it “will pay the reasonable cost either to clean or to replace” algae-streaked shingles. After year one, it issues a labor certificate worth up to $15 per square (a square is 100 square feet), prorated by how long the shingles have been installed.

What it does to the price. A 2,000 square foot roof is 20 squares, so the certificate tops out at 20 × $15 = $300 before proration. One washer’s list charges $0.25 to $0.30 a square foot, or $500 to $600 for that roof. The gap is yours.

Maker Algae coverage What a claim pays
IKO 120 months on most algae-resistant lines Year one: reasonable cost to clean or replace. After: up to $15 a square, prorated
CertainTeed 25 to 30 years (StreakFighter) Not stated on the page we checked

Claim: any washer and any method will do

What you’ll hear. Streaks are streaks; a lower-pressure wand gets them off.

What the record shows. The trade group is plain: “DO NOT use a power washer or any type of brush or broom.” It adds that other chemicals or methods shouldn’t be used without the shingle maker’s approval. The same maker-first rule shows up on walls, too, in what siding makers say about pressure washing.

What it does to the price. The right method isn’t a luxury tier. The same $0.25-to-$0.30 list describes its roof service as “ARMA-approved soft wash process — never pressure washed.”

Claim: algae-resistant shingles never need cleaning

What you’ll hear. You paid for the copper granules, so you’re done.

What the record shows. The coverage has an end date. One maker lists algae warranty coverage of 25 to 30 years; the warranty above shows 120 months on most of its algae-resistant lines. And it covers blue-green algae only. For moss, the trade group says to ask the maker. If an insurer’s photo flagged the roof, here’s how to answer it.

What it does to the price. Past that window, the wash is yours. One company in Richmond, Virginia, starts roof soft washing at $299 and prices it by home size.

Claim: one cleaning fixes the streaks for good

What you’ll hear. Pay once and the roof stays clean.

What the record shows. The trade group says bleach cleaning “is only temporary, and the discoloration may recur.” What a fresh wash looks like in its first weeks is in roof soft wash results.

What it does to the price. Plan for a repeat. Another Virginia list charges $350 to $750 for a roof soft wash, depending on the home.

Bottom line. Nothing we read says a gentle soft wash puts your warranty at risk; a wand, a brush or a careless crew might, because damage from people on the roof isn’t covered. If your shingles are algae-resistant and still inside their coverage period, check the warranty before you book: a claim may chip in toward the bill, though after year one it likely won’t cover all of it. Compare roof prices on our price index, and see how we check sources.

Sources

Based on 7 sources · How we price

Checked 2026-10-11.