Flat Roofs Slope

In general the minimum slope for a flat roof is 1 0 but as stated earlier this is only possible in theory.

Flat roofs slope. This patented technology provides a durable finish with the ability to match existing roofing compositions. The idea is to provide positive drainage toward roof drains so there is no ponding water 48 hours after a rain storm. Flat roofs or low slope roofs are also commonly found on commercial buildings throughout the world. It takes the manufacturer s recommendations the unique conditions of the roof as well as the skills and the expertise of the installer to arrive at the right slope.

The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10. Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally. These are fitted at either end of a parapet wall meaning the flat is typically angled in two directions. All of the following factors will determine whether sloped or flat roofing is most suitable for your commercial building.

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. Low slope metal roofs require less material which reduces the overall load on the building s structure. The minimum slope for a flat roof is 1 4 per foot or 1 4 12 but some owners or insurance companies require a minimum slope of 1 2 per foot. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

Thus the three main drainage systems that affect how you slope a flat roof are. Roofing materials weather peaks and valleys green building space cost. Flat roof slope minimum according to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down. Usually installed at the centre of the property this drain transports water.

This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. The roofslope auxiliary sloping compound provides a quick and easy way to fill in low spots on flat roofs and achieve positive slope to aid in proper drainage. There are roof coating products available if there isn t enough slant or slope to accomplish this. There are three types of drain systems commonly used on flat roofs.

This is the basis for calculating the angle which is approximately a 1 19 degree slope. Each of these systems has its own pros and cons.