How Do I Figure Out The Pitch Of My Roof

Rafter rise run from the pythagorean theorem.

How do i figure out the pitch of my roof.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Here s how to measure and calculate roof pitch from inside your attic. One method to find the pitch is to climb on the roof and measure the rise for a 12 run. Roof pitch refers to the slope which the rafter creates.

Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. On the roof hold the level perfectly level and measure the height from the roof to the level 12 inches away from where the level touches the surface this will be the rise. Rise run pitch where pitch is expressed in percent.

After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. You can use the following equations to find the length of the rafter and the slope. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally.

For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. You ll need a level that is 12 or longer and a tape measure. The easiest way to do this is by accessing a rafter in your attic if you can.

Generally roof pitch is calculated from the same formula that describes a right triangle. 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.