![]() They have a pitch that can be as high as 21:12 (175%). High-pitched roofs often require additional fasteners. ![]() They are the easiest ones to construct and they are safe to walk on. It is often expressed as a ratio between the rise and the run in the form of x by 12 (x:12). These are generally difficult in maintenance, as they require special materials to avoid leaks.Ĭonventional roofs have the pitch ranging from 4:12 to 9:12 (33.3% to 66.7%). Roof pitch is essentially the slope created by the roof rafter. Low pitched roofs have the pitch below 4:12 (33.3%). Generally, these roofs have a pitch from 1/2:12 to 2:12 (from 4.2% to 16.7%). We can divide roofs into the following categories:įlat roofs are not perfectly flat in reality - they need a small slope for water runoff. For example, a pitch 1:12 means that per every twelve yards of building length the rise will be equal to one yard. Roof pitch is often expressed as a ratio between rise and run in the form of x:12. It can be assessed in two ways - either as the angle the rafter makes with the horizontal or the proportion between the rise and the run of the roof. Roof pitch is simply the slope created by the rafter.
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