How To Determine Roof Pitch With A Speed Square

To convert between american roofing ratios and pitch degrees follow these steps.

How to determine roof pitch with a speed square.

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. Move the tape measure along the the roof until it hits the level at exactly the 12 inch mark. Place the pivot point against the shingles. With a torpedo level and a speed square you can pretty accurately gauge the pitch of any roof with a gable end photo 1.

Marvel at your mathematical. A 12 12 pitch roof has a pitch angle of 45. Leah answers a viewer s question about how to calculate the pitch of a roof on a structure. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

Divide the first part of the ratio by 12 to work out the pitch. Roof pitch refers to the slope which the rafter creates. Then place a torpedo level on the fat base of the rafter square and adjust the square until the level is level. Measure with a speed square a speed square and level can be used to easily find the pitch of a roof.

Set the level on the edge of the speed square as shown below then place the heel of the speed square on a rafter or gable edge of the roof. Use the torpedo level to make a plumb mark on the straightedge. Finding the pitch of a roof is simple with a speed square. Place the straightedge on the shingles in a direction perpendicular to the gutter.

Check your results with the omni roof pitch calculator. Extend it upward so it is perpendicular to the level. Because of its compact size it is frequently used as a saw guide when cutting framing members as well as a layout tool for quick 45 and 90 degree cuts. Leah s recommended tools for beginner diy ers.

The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters. Measure the roof pitch with a speed square. Find the inverse tangent of the pitch to find the angle in degrees. Measure the vertical distance from roof to level.