Roof Pitch Tables Metric

Calculate the roof pitch as the proportion of rise and run.

Roof pitch tables metric.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Calculate the length of a rafter in metres using the roof slope measured in degrees and the gable wall width in metres. Image 1 12 to 12 12 roof pitch 7 12 pitch.

If there is an overhang the rafter overhang is measured in millimetres from outside wall to inside fascia board level across. We included a roof pitch chart below the 7 12 example image and the calculator below that. Rafter length from roof slope in degrees using metric measurement. Use the following formula which also describes a right triangle.

You can also calculate roof pitch even without using a roof slope calculator. Pitch rise run 1 5 6 25. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Roof pitch and corresponding angles.

Calculate the rafter length substituting these values into the following formula. Roof pitch calculator results explained slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. If this isn t practical then perform the same measurement on the underside of the roof.

They have a pitch ranging from 4 12 to 9 12. Let s say it is equal to 1 5 m. The triangle diagram will be re drawn to scale with all dimensions marked. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.

For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be. Measure the rise of your roof. Roof pitch degree table.