Roof cleaning is the process of removing algae, mold, mildew, lichen and moss from 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.
Cleaning may be accomplished with a sodium hypochlorite (a.k.a.bleach) or sodium percarbonate solution, various cleaning products or commercial cleaning services. The Asphalt Roofing Manufacturers Association (ARMA) recommends using a 50/50 solution of laundry grade bleach and water to remove moss and algae. The addition of zinc strips near the roof's peak may reduce the regrowth of algae and moss.
Video Roof cleaning
Cleaning apparatus
Roof cleaning devices may use high-pressure water spray and revolving brushes, and some have extensions to enable their use from the ground. Because of the high pressure, damage may occur. Soft washing is the most preferred by the roofing manufacturers because it is applied at a very low pressure, allowing approved soaps and solvents to mitigate the bacteria. Soft washing can be done by changing the tip on the pressure washer so that it drops the pressure down to around 500 psi (or less), or can be done using a 12-volt, air diaphragm, or gas-engine driven pump.
Roof cleaning devices exist that may minimize the spread of airborne radioactive materials (in contaminated areas) and other harmful materials, such as asbestos. Specialized robots have been designed to facilitate cleaning roofs.
Maps Roof cleaning
See also
- Domestic roof construction
- Roofer
- Home improvement portal
References
Source of article : Wikipedia
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