Figuring Angles For Roof Trusses

Roof pitch calculator results explained.

Figuring angles for roof trusses.

What degree angle is a 12 12 pitch roof. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch. Use the protractor to measure those angles at the peak the walls and the point where the two lines intersect on the top side of the roof. Divide the first part of the ratio by 12 to work out the pitch.

A sample calculation would be. Angle the angle of a roof is the same as the roof s slope except instead of being. Find the inverse tangent of the pitch to find the angle in degrees. A roof that rises 1 inch for every 4 inches of its horizontal distance has a 1 4th pitch.

If this isn t practical then perform the same measurement on the underside of the roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The pitch highest point of the roof is an important ratio when measuring the truss. The traditional method has been rise inches 12 run inches.

Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. This is because the roof section of a building can be likened to a triangle with a base width a height in. We included a roof pitch chart below the 7 12 example image and the calculator below that. Roof angle 1 1 5 2 2 5 3 3 5 4 4 5 5 5 5 6 6 5 7 7 5 8 8 5 9 9 5 10 10 5 11 11 5 12 12 5 13 13 5 14 14 15 5 15 5 16 16 5 17.

Draw a semi circle on the graph paper mark a center peak at the top and draw two lines on each side in the shape desired for the gambrel roof. 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. So always check if you can toggle between different types of trusses with your calculator this will make it much easier to calculate all the angles heights and dimensions. To convert between american roofing ratios and pitch degrees follow these steps.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. The calculations for figuring roof angles are based on the width and height of the roof. Calculate gambrel angles with graph paper and a protractor. Outside of the u s a degree angle is typically used.

A 12 12 pitch roof has a pitch angle of 45.