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2. Roof cleaning - Wikipedia

   en.wikipedia.org/wiki/Roof_cleaning

   The equipment does not use pressure or mechanical means to clean the roof. 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 ...

3. Roof shingle - Wikipedia

   en.wikipedia.org/wiki/Roof_shingle

   Many shingle installations benefit from being placed on top of an underlayment material such as asphalt felt paper to prevent leaks even from wind driven rain and snow and ice dams in cold climates. At the ridge the shingles on one side of the roof simply extend past the ridge or there is a ridge cap consisting of boards, copper, or lead sheeting.

4. Asphalt shingle - Wikipedia

   en.wikipedia.org/wiki/Asphalt_shingle

   Asphalt shingles on a home in Avalon, New Jersey. Two types of base materials are used to make asphalt shingles, organic and fiberglass.Both are made in a similar manner, with an asphalt-saturated base covered on one or both sides with asphalt or modified-asphalt, the exposed surface impregnated with slate, schist, quartz, vitrified brick, stone, [6] or ceramic granules, and the under-side ...

5. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   Flat roofs in Israel Flat roofs in Amman, Jordan. 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°.

6. Flashing (weatherproofing) - Wikipedia

   en.wikipedia.org/wiki/Flashing_(weatherproofing)

   In earlier days, birch bark was occasionally used as a flashing material. [7] Most flashing materials today are metal, plastic, rubber, or impregnated paper. [8]Metal flashing materials include lead, aluminium, copper, [1] stainless steel, zinc alloy, other architectural metals or a metal with a coating such as galvanized steel, lead-coated copper, anodized aluminium, terne-coated copper ...

7. Moss - Wikipedia

   en.wikipedia.org/wiki/Moss

   The moss Physcomitrium patens has been used as a model organism to study how plants repair damage to their DNA, especially the repair mechanism known as homologous recombination. If the plant cannot repair DNA damage, e.g., double-strand breaks , in their somatic cells , the cells can lose normal functions or die.