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<p>We clean commercial roofs by removing debris, algae, mold, mildew, lichen and moss. Cleaning extends the duration of your roof's ability to function — organic growth holds moisture against the surface, and moisture is what shortens a roof's life.</p><p>Large commercial roofs are quoted by roof area rather than as a flat figure, which is the only honest way to price a surface that might be eleven thousand square feet on one building and twice that on the next. We measure, then quote.</p><p>The method is low pressure throughout. Pressure washing a roof strips granules from shingles and drives water under seams and flashings — it does damage that looks like cleaning for about a month.</p>