Roof Slope Run Rise

Measure from the attic.

Roof slope run rise.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. How to calculate the pitch of a roof method one. One method to find the pitch is to climb on the roof and measure the rise for a 12. The rise is basically the distance from the top of the roof to the bottom.

Another method to find the roof pitch is to go into the attic and measure the rise. Although the top of the roof may be clearly defined the bottom is a little harder to determine. It is very important to know that the rise for a bastard pitch rafter is just like the rise for a standard rafter. This article series gives clear examples just about every possible way to figure out any or all roof dimensions and measurements expressing the roof area width length slope rise run and unit rise in inches per foot.

Roof pitch refers to the slope which the rafter creates. In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. The rise is the distance from the top of the roof to the bottom.

So a 3 inch rise roof also described as a 3 in 12 roof means that for every 12 or foot of horizontal distance the height of the roof increases by 3. The run is the distance from the outside of the wall to the inside of the ridge. Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. Roofers express roof slope as rise or pitch measured in inches of vertical rise per foot of horizontal distance or run.

This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. Measure from the roof.