Patio Roof Slope Ratio

A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.

Patio roof slope ratio.

Roof pitch calculator results explained. You can divide roofs into these categories. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. The minimum pitch for. Determine the minimum slope of the roof based on the roofing material. A roof slope of greater than 7 12 such as slopes between 8 12 to 12 12 is where the air dynamic issues start to arise requiring additional roof bracing to help mitigate the higher overall profile of the roof.

So in this example to find the fall you need to divide the distance run by 80. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Generally such roofs have a pitch ranging from 1 2 12 to 2 12.

In this example that means that the patio should fall 1 unit for every 80 units of distance. Typically you can use the industry standard ratio for fall of 1 80.