Roof cleaning

<p>Roof cleaning is the process of removing <a href="/facts/Algae/U1ftVKU3">algae</a>, mold, mildew, lichen and <a href="/facts/Moss/YF8Rbf8y">moss</a> from <a href="/facts/Roof/JwpVpNRk">roofs</a>. Also cleaning oxidation on metal roofs. Cleaning can extend the duration of a roof's ability to function. Algae and other types of build-up often form on the north and west parts of roofs that are shaded or receive less sun, and can reduce a roof's life expectancy. The presence of soot, dirt, or biomass can affect how much sunlight is absorbed by a roof and thus the amount of heat a building absorbs.
</p><p>Cleaning may be accomplished with a <a href="/facts/Bleach/QPxAysPl">bleach</a> or <a href="/facts/Sodium_percarbonate/tdPKeNvI">sodium percarbonate</a> solution, various cleaning products or commercial cleaning services. The Asphalt Roofing Manufacturers Association (ARMA) recommends using a 50/50 solution of household strength <a href="/facts/Sodium_hypochlorite/sp99uHHQ">sodium hypochlorite</a> (pool chlorine) and water to remove moss and algae. The addition of <a href="/facts/Zinc/80b1qgk3">zinc</a> strips near the roof's peak may reduce the regrowth of algae and moss. <a href="/facts/Zinc_sulfate/uwhWDMCC">Zinc sulfate</a> can also be applied on an annual basis.
</p>

Roof cleaning open-in-new

Roof cleaning