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2. Roof pitch - Wikipedia

   en.wikipedia.org/wiki/Roof_pitch

   Roof pitch is the steepness of a roof expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. A flat roof has a pitch of zero in either instance; all other roofs are pitched .

3. Impervious surface - Wikipedia

   en.wikipedia.org/wiki/Impervious_surface

   Parking lots are highly impervious.. Impervious surfaces are mainly artificial structures—such as pavements (roads, sidewalks, driveways and parking lots, as well as industrial areas such as airports, ports and logistics and distribution centres, all of which use considerable paved areas) that are covered by water-resistant materials such as asphalt, concrete, brick, stone—and rooftops.

4. Stone-coated metal roofing - Wikipedia

   en.wikipedia.org/wiki/Stone-coated_metal_roofing

   Stone coated metal roofing was refined during and after World War II in the United Kingdom, when the government requested materials that would protect corrugated steel roofs from the harsh climate. A coating of bitumen and subsequent covering by sand , stone or other materials proved effective at protecting the metal roofs and serving as ...

5. Roof - Wikipedia

   en.wikipedia.org/wiki/Roof

   The characteristics of a roof are dependent upon the purpose of the building that it covers, the available roofing materials and the local traditions of construction and wider concepts of architectural design and practice, and may also be governed by local or national legislation. In most countries, a roof protects primarily against rain.

6. Hip roof - Wikipedia

   en.wikipedia.org/wiki/Hip_roof

   A hip roof, hip-roof [1] or hipped roof, is a type of roof where all sides slope downward to the walls, usually with a fairly gentle slope, with variants including tented roofs and others. [2] Thus, a hipped roof has no gables or other vertical sides to the roof. A square hip roof is shaped like a pyramid.

7. Asphalt roll roofing - Wikipedia

   en.wikipedia.org/wiki/Asphalt_roll_roofing

   Asphalt roll roofing or membrane is a roofing material commonly used for buildings that feature a low sloped roof pitch in North America. The material is based on the same materials used in asphalt shingles ; an organic felt or fiberglass mat, saturated with asphalt , and faced with granular stone aggregate.

8. Sierpiński carpet - Wikipedia

   en.wikipedia.org/wiki/Sierpiński_carpet

   Then there is a square centered at P which is entirely contained in the carpet. This square contains a smaller square whose coordinates are multiples of ⁠ 1 / 3 k ⁠ for some k. But, if this square has not been previously removed, it must have been holed in iteration k + 1, so it cannot be contained in the carpet – a contradiction.

9. Green roof - Wikipedia

   en.wikipedia.org/wiki/Green_roof

   A properly designed and installed extensive green-roof system can cost $108–$248/m 2 ($10–$23/sq ft) while an intensive green roof costs $355–$2,368/m 2 ($33–$220/sq ft) However, since most of the materials used to build the green roof can be salvaged, it is estimated that the cost of replacing a green roof is generally one third of the ...