Roof Slope Run Rise

Although the top of the roof may be clearly defined the bottom is a little harder to determine.

Roof slope run rise.

Roofers express roof slope as rise or pitch measured in inches of vertical rise per foot of horizontal distance or run. Roof pitch refers to the slope which the rafter creates. The rise is the distance from the top of the roof to the bottom. How to calculate the pitch of a roof method one.

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. 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. One method to find the pitch is to climb on the roof and measure the rise for a 12.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. 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. The run is the distance from the outside of the wall to the inside of the ridge.

It is the vertical distance a rafter travels. It is very important to know that the rise for a bastard pitch rafter is just like the rise for a standard rafter. 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. Measure from the attic.

Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. Another method to find the roof pitch is to go into the attic and measure the rise.