Parapet Height Against Sloped Roof

Wsrca suggests for walls 24 inches and taller that wall cladding be considered in lieu of membrane wall flashings per detail tp 8a.

Parapet height against sloped roof.

Different types of parapet walls and their uses are discussed below. Contents types of parapet wallsclassification based on appearance 1. To connect the flashing material to other building materials such as masonry concrete metal and wood. Parapets are a combination of wall and roof pressures.

Flashing application requirements are similar for all types of low slope roof materials and systems. To seal the juncture of the roof membrane with other building components such as walls edges and penetrations. Wind load on sloped roof with parapet date. Historically so many problems have occurred with parapets that we have a name for it.

The profile of specific components their. This detail may be used where wall heights are 24 48 inches above roof surface. Exception to section 1730. Overflow drains having the same size as the roof drains shall be installed with the inlet flow line located 2 inches 51 mm above the low point of the roof or overflow scuppers having three times the size of the roof drains and having a minimum opening height of 4 inches 102 mm shall be installed in the adjacent parapet walls with the inlet flow located 2 inches 51 mm above the low point.

Section 1731 applies instead of section 1730 for roofing work on new production type residential construction with roof slopes 3 12 or greater. Parapet walls can be constructed using different materials like reinforced cement concrete steel aluminium glass etc. Where the roof slopes toward a parapet at a slope greater than two units vertical in 12 units horizontal 16 7 percent slope the parapet shall extend to the same height as any portion of the roof within a fire separation distance where protection of wall openings is required but in no case shall the height be less than 30 inches 762 mm. On walls greater than 36 inches high membrane wall flashing sheets are suggested to be strapped i e installed vertically.

A parapet wall is a low or dwarf wall built along the edge of the roof terrace walkway balcony etc. The height of parapets shall not be included in the roof height measurements. Parapetitus they have a long history which of course is not always clear that allows me to embellish without threat of peer review reversal. Yes i am looking at asce 7.

Sun 30 nov 2008 13 21 22 0800 say you have a small existing victorian wood building 30 x 22 12 ceiling with a 22 5 degree roof pitch 5 ridge height gable ends but 2 orthoganal walls have a 4 parapet 1 foot lower than the ridge the front gable end and one side have. The exact height of the parapet is not factored into the roof wind uplift calculations but if the parapet is 3 feet or higher the perimeter values can be used at the corners lowering the uplift requirements for that portion of the roof area.