Flat Roof With Applied Pitch

The hot applied asphalt or coal tar pitch blends with the bitumen soaked roof felt and creates a monolithic roof membrane.

Flat roof with applied pitch.

Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof flat roofs or low slope roofs are also commonly found on commercial. A flat roof is a roof which is almost level in contrast to the many types of sloped roofs the slope of a roof is properly known as its pitch and flat roofs have up to approximately 10. Flat roofing is not actually flat. However over the last few decades new and advanced materials have been developed.

When we roof a flat or low slope roof we use a membrane system to cover it. Most flat roofs are typically not as long lasting or durable as sloped ones because the latter shed snow and rain a lot quicker. A classic flat roof is either almost completely level or has a very slight pitch of 3 in 12 inches or less. A membrane system is a sheet of roofing material which we install to keep even standing water from leaking into the building.

A 900 square foot flat roof in the san francisco area made of concrete tiles costs. It has a very low slope between 1 4 to 1 2 inch per foot so that it drains water. But such a low slope holds snow and water much longer than a steeply pitched roof and therefore needs a very different material to stay watertight. We also cover spray applied foam and liquid roofing options.

Pitched roofs are anything 4 and 12 or above. Membrane roofing is often used on commercial flat roofs. The roof felt asphalt tar layering is repeated in overlapping layers until the assembly is two to fours plies in thickness. Common flat roof membranes discussed in this article include built up asphalt tar and gravel modified bitumen and single ply membranes like epdm pvc tpo and kee.

Anything pitched 3 and 12 or less is considered a low sloped roof.