1 12 Slope On A 30 Roof Is How High

Determine the desired grade typically 1 2 1 8 per foot to 1 4 per foot is enough to provide enough runoff.

1 12 slope on a 30 roof is how high. For instance if you travel 3 inches vertically and 3 feet 36 inches horizontally the slope would be 3 36 or 1 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Tie a string at a fixed height on the hinge. Most roof s have a pitch in the 4 12 to 9 12 range.

The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. Pound grade stakes into the ground on each end of the area you need sloped. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. Both numbers must use the same units.

You can also calculate roof pitch even without using a roof slope calculator. Steeper slopes increase the sail effect that makes them susceptible to wind. 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. The stake at the top of the slope is called the hinge.

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. These roofs have a pitch less than 4 12. Pitch angle precision color. The stake at the bottom of the slope is called the toe.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. They have a pitch ranging from 4 12 to 9 12. The pitch of a roof determines the height of the ridge board that runs the length of the house. Conventional roofs are the easiest to construct and you can walk on them safely.

Rafters are nailed to the ridge board and run down to overhang the exterior wall. Lower slopes don t handle wind driven rain as well. Carpenters measure roof pitch as inches of rise per 12 inches of run. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.

The triangle diagram will be re drawn to scale. Angle the angle of a roof is the same as the roof s slope except instead of being. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Roof pitch calculator results explained.

A 1 in 12 roof pitch roof rises 1 inch for every 12 inches of run. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. Slope gradients are written as y x where y is a single unit in rise and x is the run. This is read as a one in twelve slope.