How To Use A Speed Square To Measure Roof Pitch

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How to use a speed square to measure roof pitch.

Directly below the 6 inch mark on the framing square read the required rafter length 13 42 per foot of run for a 6 inch rise 6 in 12 roof. Align the lip of the rafter angle square along the plumb line. 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. Measuring pitches part of the speed square s role as a protractor and its original mission as a tool is in quickly finding common and uncommon rafter angles for the pitches on roofs.

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. Use a spirit level to mark a straight vertical line across the rafter. Knowing how to calculate roof pitch rise run and ridge board height is essential to any shed construction.

Find a common rafter angled with the pitch of the roof. A speed square and level can be used to easily find the pitch of a roof. 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 the shed is unfinished then simply prop the speed square against the roof framing such as the rafter and repeat the same method.

Read the pitch on the side of the rafter square. This is accomplished by use of the main protractor and two specialty protractor angle guides on the inside of the tool. With a torpedo level and a speed square you can pretty accurately gauge the pitch of any roof with a gable end photo 1. This is called the plumb line.

A roof pitch calculator can make things much easier. Place the pivot point against the shingles. Shed roof pitch calculator. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.