Patio Roof Slope Ratio

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.

Patio roof slope ratio.

Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. The minimum pitch for. In this example that means that the patio should fall 1 unit for every 80 units of distance. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.

However this could differ depending on your project. Typically you can use the industry standard ratio for fall of 1 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. Generally such roofs have a pitch ranging from 1 2 12 to 2 12.

So in this example to find the fall you need to divide the distance run by 80. Determine the minimum slope of the roof based on the roofing material. 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.

Roof pitch calculator results explained. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof.