1 8 Roof Slope

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.

1 8 roof slope.

The pitch of this roof is 4 8 12. You can go by the measurements taken by walking the roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope.

A roof that rises 8 feet over a 24 foot span was said to have a 1 to 3 pitch. This means that the rise of the slope goes up or down 8 inches for every 12 inches. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. The maths behind this number is that it is the square root of rise run 2 1.

Measuring the slope from the rafters. 0 pitch 1 00x the roof area. Set the level on the edge of the speed square as shown below then place the heel of the speed square on a rafter or gable edge of the roof. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less.

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. To put it in perspective the angle of this slope would be around 30 degrees. Angle the angle of a roof is the same as the roof s slope except instead of being. For instance if you travel 3 inches vertically and 3 feet 36 inches horizontally the slope would be 3 36 or 1 12.

This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. If the rise is 4 feet over a 24 foot span then the roof pitch was said to be 1 to 6 the pitch can be expressed numerically as a fraction. A speed square and level can be used to easily find the pitch of a roof. Calculating a slope gradient.

Since this is a flat roof or nearly flat roof. Measure with a speed square. The most precise way to find the roof s slope is by measuring it from the underside. Roof pitch calculator results explained.

The calculator above can handle much of this math. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42. Access one of the rafters then take the measurement this way.

Slope gradients are written as y x where y is a single unit in rise and x is the run. An example for a steep sloped roof is 8 12. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator.