Finding Roof Pitch Speed Square

The maths behind this number is that it is the square root of rise run 2 1.

Finding roof pitch speed square. A roof slope of 4 12 is a 1 6 pitch a 6 12 slope is a 1 4 pitch an 8 12 slope is a 1 3 pitch and so on. I hear read all too often this misuse and usually ignore it. Finding the pitch of a roof is simple with a speed square. Leah s recommended tools for beginner diy ers.

Simply plug in the. 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. Before miter saws and even since professional carpenters used speed squares as a quick saw guide for cutting 45 and 90 degree angles. 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. 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. Photo 2 shows how to use the speed square to mark a 33 1 2 degree angle the same as you would need on a rafter tail for a roof with an 8 12 pitch. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.

The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters. Shed roof pitch calculator. It is often compared to slope but is not exactly the same. 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.

Knowing how to calculate roof pitch rise run and ridge board height is essential to any shed construction. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. If the shed is unfinished then simply prop the speed square against the roof framing such as the rafter and repeat the same method. A roof pitch calculator can make things much easier.