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2. Roof cleaning - Wikipedia

   en.wikipedia.org/wiki/Roof_cleaning

   Using a pressure washer, or any other gas powered device, to clean a roof at more than 100 PSI can damage the roof. The U.S. based Asphalt Roofing Manufacturers' Association specifies the use of a bleach cleaning solution, without the use of a pressure washer, to remove algae from a roof. ARMA discourages the use of a pressure washer, a flat ...

3. Pressure washing - Wikipedia

   en.wikipedia.org/wiki/Pressure_washing

   Siding, gutters, roofs, decks, and windows can all be cleaned effectively with the use of a cold water pressure washer. Surface cleaners are pressure wash tools that facilitate the even cleaning of larger flat surface areas. There are many models available that attach to the end of a pressure washer wand.

4. Soft washing - Wikipedia

   en.wikipedia.org/wiki/Soft_washing

   Soft washing is a cleaning method using low pressure water. More recently, the term "softwashing" has been used to describe any form of spraying chemicals at buildings where solutions (typically sodium hypochlorite based softwashing chemicals) are used to remove mildew, bacteria, algae and other organic stains from roofs and other building exteriors.

5. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°. [1] Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof. Flat roofs, or "low ...

6. Reflective surfaces (climate engineering) - Wikipedia

   en.wikipedia.org/wiki/Reflective_surfaces...

   Cleaning a cool roof can restore solar reflectance close to its installed condition. Always check with your roof manufacturer for the proper cleaning procedure, as some methods may damage your roof. While it is generally not cost effective to clean a roof just for the energy savings, roof cleaning can be integrated as one component of your roof ...

7. The 6 most common headache types — and when to see a doctor

   www.aol.com/6-most-common-headache-types...

   A headache is a pain in the head, neck or face that is often described as a sensation of pressure that varies in location, frequency and severity, according to the National Institutes of Health.