Parapet Roof Slope

The parapet roof by far the most common type of flat roof isn t actually flat at all.

Parapet roof slope.

Balloon framed parapets are formed when the wall system bypasses the roof system to form a wall that extends above the roofline. Roofing association manuals as well as the code book specify a minimum slope of 1 4 inch per foot for low slope roofing. These are fitted at either end of a parapet wall meaning the flat is typically angled in two directions from the middle. Low sloped roofs are allowed for larger structures or to match existing conditions on renovation projects.

A minimum slope of 1 2 per foot and a warranty are required on all new roofs. Thus the three main drainage systems that affect how you slope a flat roof are. You can order the foam in different slopes. The variations in angled slopes for flat roof systems depend on the types of drainage the property decides to install.

And always have drip edges front and back so they don t stain the building façade. Make sure there is a waterproof membrane under the coping. In this configuration the roof structure is commonly hung from the wall structure or supported by a separate superstructure inboard of the wall system. Convert existing flat roofs to sloped roofs when re roofing if supported by life cycle cost and structural analysis.

One cool trick is to use a slope kit consisting of sheets of foam that are tapered to provide the necessary slope. Slope the top of them inward so they don t stain the building façade. Parapet water management keep rainwater from getting into the top of them.