Flat Roof Parapet Wall Height

Top of parapet below cap to be sealed with fluid applied flashing.

Flat roof parapet wall height.

The assembly is straight forward but what complicates matters is that the roof needs to be vented. In order for a roof parapet to provide adequate fall protection a roof parapet railing should be at least 42 in height. Incidentally another benefit parapet walls is that they help conceal such eyesores. Do not lap tpo over top of parapet unless required by unique construction conditions.

If you didn t get it right you concentrated the stresses at roof edges and you could suck in a parapet or tear or rip a membrane at the parapet photographs 3 and 4. The parapet itself is standard wood framing with an applied siding in this case t g 1 4 cedar. I do not know of any minimums for the height of a parapet only good design and use of quality roofing flashing etc. Height of roofing at wall.

At the highest point of the sloped roof the parapet is about 10 tall at the lowest point the parapet is about 14 tall. If a parapet wall is a minimum of 30 high and the height plus the width of the wall is a least 48 then it was determined that the fall hazard was removed and this was a compliant method to protect construction employees. Unfortunately many buildings get close to this height without quite meeting the height required by osha to provide fall protection. The parapet height may have to have a minimum height if it is part of a fire rated assembly between units depending upon the use and classification of the structure.

Courtesy of max baker and the national research council of canada. To ensure a waterproof application. There are several solutions to help you raise the height of your parapet that are cost effective and aesthetically pleasing. Minimum of 12 to top of parapet.

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.