Roof Slope Run Rise

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

Roof slope run rise.

It is very important to know that the rise for a bastard pitch rafter is just like the rise for a standard rafter. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Roofers express roof slope as rise or pitch measured in inches of vertical rise per foot of horizontal distance or run. How to calculate the pitch of a roof method one.

It is the vertical distance a rafter travels. The rise is the distance from the top of the roof to the bottom. The run is the distance from the outside of the wall to the inside of the ridge. Although the top of the roof may be clearly defined the bottom is a little harder to determine.

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Measure from the attic. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.

The rise is basically the distance from the top of the roof to the bottom. In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. Another method to find the roof pitch is to go into the attic and measure the rise. Measure from the roof.

Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. One method to find the pitch is to climb on the roof and measure the rise for a 12.