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  2. Rain gutter - Wikipedia

    en.wikipedia.org/wiki/Rain_gutter

    A roof must be designed with a suitable fall to allow the rainwater to discharge. The water drains into a gutter that is fed into a downpipe. A flat roof should have a watertight surface with a minimum finished fall of 1 in 80. They can drain internally or to an eaves gutter, which has a minimum 1 in 360 fall towards the downpipe.

  3. Cricket (roofing) - Wikipedia

    en.wikipedia.org/wiki/Cricket_(roofing)

    In some cases, a cricket can be used to transition from one roof area to another. On low-slope and flat roofs with parapet walls, crickets are commonly used to divert water to the drainage, against or perpendicular to the main roof slope. The pitch of a cricket is sometimes the same as the rest of the roof, but not always. For Steep-slope roofs ...

  4. Drainage gradient - Wikipedia

    en.wikipedia.org/wiki/Drainage_gradient

    Drainage gradient (DG) is a term in road design, defined as the combined slope due to road surface cross slope (CS) and longitudinal slope (hilliness). Although the term may not be used, the concept is also used in roof design and landscape architecture. If the drainage gradient is too low, rain and melt water drainage will be insufficient.

  5. Roof pitch - Wikipedia

    en.wikipedia.org/wiki/Roof_pitch

    Display of roof pitches 1:12 through 18:12 A roof made of thatch, one of the oldest roofing materials, needs a steep pitch to drain properly Some types of stone roof have a very restrictive roof pitch, which can lead to leaking Working on roofs with pitches too steep for safety requires a staging of scaffolding boards secured with roof brackets A pitch gauge measuring the slope of an asphalt ...

  6. Sima (architecture) - Wikipedia

    en.wikipedia.org/wiki/Sima_(architecture)

    The sima runs around all four sides of a building.It may be made of terracotta or stone. There are two basic types of sima: The raking sima; The lateral sima; The raking sima is continuous and generally follows the slope of the roof.

  7. Leader head - Wikipedia

    en.wikipedia.org/wiki/Leader_Head

    Leader heads have historically provided an opportunity to incorporate a decorative element within their design. These elements, as are the other roof drainage system components, gutters, scuppers [ 3 ] [ 4 ] or downspouts, have to be sized to perform well, according to the amount of precipitation that they are intended to help alleviate.

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