Finding Roof Pitch Speed Square

Simply plug in the.

Finding roof pitch speed square. 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 maths behind this number is that it is the square root of rise run 2 1. 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. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.

Leah answers a viewer s question about how to calculate the pitch of a roof on a structure. If the shed is unfinished then simply prop the speed square against the roof framing such as the rafter and repeat the same method. The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters. I hear read all too often this misuse and usually ignore it.

Shed roof pitch calculator. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Knowing how to calculate roof pitch rise run and ridge board height is essential to any shed construction. Before miter saws and even since professional carpenters used speed squares as a quick saw guide for cutting 45 and 90 degree angles.

A roof pitch calculator can make things much easier. 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 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. Finding the pitch of a roof is simple with a speed square.

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. Leah s recommended tools for beginner diy ers. 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. 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.