Roof Pitch Tables Metric

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

Roof pitch tables metric.

Roof pitch degree table. Image 1 12 to 12 12 roof pitch 7 12 pitch. 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. Visit this page using a phone or tablet to directly measure pitch and angles.

We included a roof pitch chart below the 7 12 example image and the calculator below that. If this isn t practical then perform the same measurement on the underside of the roof. 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. 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.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. 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. They have a pitch ranging from 4 12 to 9 12.

Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. If there is an overhang the rafter overhang is measured in millimetres from outside wall to inside fascia board level across. Pitch rise run 1 5 6 25. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12.

Measure the rise of your roof. Let s say it is equal to 1 5 m. 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.

Use the following formula which also describes a right triangle. Drag sliders to animate the results and diagram. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 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.

The triangle diagram will be re drawn to scale with all dimensions marked. 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. 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. Calculate the rafter length substituting these values into the following formula.