Flat Roof Parapet Height

The minimum height of a parapet wall above the roof surface is 30 inches.

Flat roof parapet height.

Unfortunately many buildings get close to this height without quite meeting the height required by osha to provide fall protection. It is used at a single ply roof membrane sloped per foot to a gutter like on the bainbridge residence that we designed and built above. Minimum of 12 to top of parapet. 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. Do not lap tpo over top of parapet unless required by unique construction conditions. Top of parapet below cap to be sealed with fluid applied flashing. 2015 ibc code commentary.

The height of the building is calculated to the highest roof element not the parapet or mechanical protrusions vents chase etc. In order for a roof parapet to provide adequate fall protection a roof parapet railing should be at least 42 in height. The parapet itself is standard wood framing with an applied siding in this case t g 1 4 cedar. Also there may be several roof penetrations and other obstacles that should be factored into the measurement.

First of all commercial and multi unit residential buildings are a lot bigger than single family homes in most cases. There are several solutions to help you raise the height of your parapet that are cost effective and aesthetically pleasing. The assembly is straight forward but what complicates matters is that the roof needs to be vented. Measuring a flat roof on a typical commercial building with a parapet can be arduous and complicated.