How To Find Existing Roof Pitch

Total height of building.

How to find existing roof pitch. For more complex roofs you may need to calculate it section by. A 30 roof pitch is roughly the same as a 7 12 roof pitch. Find the tangent of the angle tan angle. The most precise way to find the roof s slope is by measuring it from the underside.

The slope is the same as the pitch. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. 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. Access one of the rafters then take the measurement this way.

This gives you the pitch of the roof. First measure 12 inches from one end of the level and make a mark. Enter any angle or fraction of angle to find pitch. If you need to find the pitch of an existing roof all you need is a level and a tape measure.

For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Locate the level s 12 inch mark. You ll need a level that is 12 or longer and a tape measure. One method to find the pitch is to climb on the roof and measure the rise for a 12 run.

Enter any pitch or fraction of pitch to find angle. How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Working from the interior side of the roof you ll need access to a roof rafter to measure the pitch.

Place the level horizontally along the rafter until it contacts the roof sheathing avoiding any protruding roof nails. This is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations. Roof pitch calculator results explained 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.