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.

How to determine roof pitch with a speed square.

A 12 12 pitch roof has a pitch angle of 45. Extend it upward so it is perpendicular to the level. Divide the first part of the ratio by 12 to work out the pitch. The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters.

Hold the 0 mark of the tape measure against the roof. Read the pitch on the side of the rafter square. Check your results with the omni roof pitch calculator. Leah s recommended tools for beginner diy ers.

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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Measure the vertical distance from roof to level. Place the straightedge on the shingles in a direction perpendicular to the gutter.

Use the torpedo level to make a plumb mark on the straightedge. Measure with a speed square a speed square and level can be used to easily find the pitch of a roof. To convert between american roofing ratios and pitch degrees follow these steps. With a torpedo level and a speed square you can pretty accurately gauge the pitch of any roof with a gable end photo 1.

Measure the roof pitch with a speed square. Find the inverse tangent of the pitch to find the angle in degrees. 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. The pitch can also be measured if only a level mark can be made.

Then place a torpedo level on the fat base of the rafter square and adjust the square until the level is level. Finding the pitch of a roof is simple with a speed square. Roof pitch refers to the slope which the rafter creates. Marvel at your mathematical.