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2. Roof cleaning - Wikipedia

   en.wikipedia.org/wiki/Roof_cleaning

   One safe and effective means to clean a roof is an electric agricultural sprayer system, as originally developed in Florida, USA in the early 1990s. [6] The equipment is used to apply a cleaning solution (typically containing bleach) that kills the algae, bacteria, mold, mildew, moss, fungus and other organic organisms growing on the roof.

3. An insurer dropped these San Francisco homeowners ... - AOL

   www.aol.com/finance/insurer-dropped-san...

   An aerial photograph that allegedly showed "moss, mildew, algae, and mold" on their roof. But the picture, which appeared to be from Google Earth, showed "absolutely nothing!" Karen Hoover told ...

4. Removing moss from crevices of a roof - AOL

   www.aol.com/news/removing-moss-crevices-roof...

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5. Moss - Wikipedia

   en.wikipedia.org/wiki/Moss

   The application of products containing ferrous sulfate or ferrous ammonium sulfate will kill moss; these ingredients are typically in commercial moss control products and fertilizers. Sulfur and iron are essential nutrients for some competing plants like grasses. Killing moss will not prevent regrowth unless conditions favorable to their growth ...

6. Pentachlorophenol - Wikipedia

   en.wikipedia.org/wiki/Pentachlorophenol

   Pentachlorophenol (PCP) is an organochlorine compound used as a pesticide and a disinfectant.First produced in the 1930s, it is marketed under many trade names. [5] It can be found as pure PCP, or as the sodium salt of PCP, the latter of which dissolves easily in water.

7. Thatching - Wikipedia

   en.wikipedia.org/wiki/Thatching

   Over 250 roofs in Southern England have base coats of thatch that were applied over 500 years ago, providing direct evidence of the types of materials that were used for thatching in the medieval period. [6] [page needed] Almost all of these roofs are thatched with wheat, rye, or a "maslin" mixture of both. Medieval wheat grew to almost 6 feet ...