How To Figure Out Roof Pitch With Speed Square

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How to figure out roof pitch with speed square. If you need to find the pitch of an existing roof all you need is a level and a tape measure. Roof pitch area multipliers. Place the pivot point against the shingles. Calculate the roof pitch as the proportion of rise and run.

A speed square and level can be used to easily find the pitch of a roof. Then place a torpedo level on the fat base of the rafter square and adjust the square until the level is level. The pitch of the roof is the rise over a 12 inch 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.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Place the pivot point on the square against the bottom of the rafter and align the 90 degree angle side of the square with the pencil mark. Measure the vertical distance from roof to level. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Extend it upward so it is perpendicular to the level. Measure the rise of your roof. Use a level and a pencil to make a plumb vertical line on one face of an existing rafter.

For example a 4 12 pitch roof that is 100 square feet. Calculate the rafter length substituting these values into the following formula. Let s say it is equal to 1 5 m. Move the tape measure along the the roof until it hits the level at exactly the 12 inch mark.

Use our roof pitch calculator to find the pitch of your roof. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Read the pitch on the side of the rafter square. Place the level horizontally along the rafter until it contacts the roof sheathing avoiding any protruding roof nails.

Pitch rise run 1 5 6 25. Hold the 0 mark of the tape measure against the roof. Working from the interior side of the roof you ll need access to a roof rafter to measure the pitch.