How To Find The Angle Of A Roof Rafter

There is no standard universal pitch of roof.

How to find the angle of a roof rafter.

Use your roofing square set to the plumb cut to mark the plumb angles down from those points. The picture below shows the first rafter lengths in green which is from the ridge to the wall plate. Access one of the rafters then take the measurement this way. 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 a roof that rises 6 inches for every 12 inches of horizontal run has a 6 12 pitch. Locate the level s 12 inch mark. With the tape measure hooked onto the top end transfer your two rafter lengths onto the top edge of the timber. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch.

Use a level against the underside of the rafter you re measuring to get the most accurate value. If you are calculating rafter length from the center of the ridge beam as shown below you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. Roof pitch rafters and how to calculate angles roof pitch is measured in a rise to run ratio with the vertical rise always shown first. The length of rafters length overhang the angle of the saw cut the distance to drinking.

The most precise way to find the roof s slope is by measuring it from the underside. It varies depending on culture climate style and available materials. The drawings and the size of the rafters are generated in real time. The calculator provides online calculate the length of rafters a gable roof.