Finding The Slope Of A Roof

How to convert roof pitch to degrees.

Finding the slope of a roof.

To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. First convert the pitch to a slope. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. Rise run rise run slope.

This will be a right triangle. For example if you find 4 inches of height with the tape measure at the 12 inch mark on the level your slope is 4 12 or 4 in 12. Find the pitch of the roof shown. The slope of your roof is the ratio of vertical distance rise to horizontal distance run.

Let us then try to put a slope of 4 as in the previous example on the coordinate system. If we graph the slope on the coordinate system we will be able to derive another useful formula. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

To do this simply convert the rise and run as a fraction to a decimal form eg. Then put a run of 2. Use the pythagorean theorem to solve. You need to consider the slope requirements of each panel to determine this minimum slope.

The profile is the shape taken by the sheets when you bend them to form panels. The minimum slope of a roof depends on the roof s profile. Minimum roof slope of. Just write down the measurements you found.

Roof pitch calculator results explained. You can put this solution on your website. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. How to find the slope when we don t know the rise and the run.

Angle the angle of a roof is the same as the roof s slope except instead of being. There s no need to simplify them. Metal roof panels should be installed on roof slopes according to particular seams 2015 irc r905 10 2. Roof slope pitch rise run area calculation methods.

The pitch of a roof is its slope. Put a rise of 8 anywhere you wish. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Let the slope the hypotenuse c.

If this isn t practical then perform the same measurement on the underside of. Built up roofs should be installed on roof slopes 0 25 12 or greater 2015 irc r905 9 1 except for coal tar built up roofs that have a minimum roof slope of one eighth unit vertical in 12 units horizontal 1 slope.