How To Find The Pitch Of A Roof With A Speed Square

The pitch tells you the amount of vertical rise in inches for every 12 in.

How to find the pitch of a roof with a speed square.

For example using the numbers from our roof framing square table example just above. With a torpedo level and a speed square you can pretty accurately gauge the pitch of any roof with a gable end photo 1. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters.

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. I hear read all too often this misuse and usually ignore it. If we know the roof run and rafter length we find the roof slope by calculation or we use the framing square table just below and then easily find the roof rise. Or 17 x 12 204 in.

A speed square will have two specialty protractor angle guides on the inside of the tool which has both common rafter angles and hip valley angles marked out. It is often compared to slope but is not exactly the same. The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. If a magazine such as finehomebuilding is going to put out an article to teach a topic it should use the proper words and definitions.

Measured rafter run rr 17 ft. 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. Finding the pitch of a roof is simple with a speed square. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

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. A speed square and level can be used to easily find the pitch of a roof.