Figuring Roof Pitch

How do you calculate a roof pitch.

Figuring roof pitch.

Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards. Often you express roof pitch as the ratio between the rise and the run in the form of. Homes and other buildings have roofs with slopes ranging from no slope or flat to very steep slopes. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

Before you calculate roof pitch you ll need to measure the slope of your roof. Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Angle the angle of a roof is the same as the roof s slope except instead of being. Roof pitch is used to describe the slope or angle of the roof.

Roof pitch refers to the slope which the rafter creates. 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. Rise run pitch where pitch is expressed in percent. The easiest way to do this is by accessing a rafter in your attic if you can.

How to measure roof pitch. Rafter rise run from the pythagorean theorem. 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 can use the following equations to find the length of the rafter and the slope.

Generally roof pitch is calculated from the same formula that describes a right triangle. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. How to calculate roof pitch. How to calculate the pitch of a roof.