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  2. Roof pitch - Wikipedia

    en.wikipedia.org/wiki/Roof_pitch

    The pitch of a roof is its vertical 'rise' over its horizontal 'run’ (i.e. its span), also known as its 'slope'. In the imperial measurement systems, "pitch" is usually expressed with the rise first and run second (in the US, run is held to number 12; [1] e.g., 3:12, 4:12, 5:12). In metric systems either the angle in degrees or rise per unit ...

  3. Bituminous waterproofing - Wikipedia

    en.wikipedia.org/wiki/Bituminous_waterproofing

    The underlayment also sheds any water which penetrates the roof covering from an ordinary leak, a leak from wind-driven rain or snow, wind damage to the roof covering, or ice dams. However, the application of underlays may increase the roof temperature, which is the leading cause of ageing of asphalt shingles. Not installing an underlay may ...

  4. 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.

  5. Asphalt shingle - Wikipedia

    en.wikipedia.org/wiki/Asphalt_shingle

    A shingle manufacturer's warranty may pro-rate repair costs, cover materials only, have different warranty periods for different types of damage, and transfer to another owner. [12] Three-tab asphalt shingle roofing in good condition. Shingles tend to last longer where the weather stays consistent, either consistently warm, or consistently cool.

  6. Roof - Wikipedia

    en.wikipedia.org/wiki/Roof

    These buildings tend to accumulate a large amount of snow on them, which is seen as a factor in their insulation. The pitch of the roof is in part determined by the roofing material available, a pitch of 3 in 12 (1:4) or greater slope generally being covered with asphalt shingles, wood shake, corrugated steel, slate or tile.

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