1 8 Roof Slope

This means that the rise of the slope goes up or down 8 inches for every 12 inches.

1 8 roof slope.

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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Access one of the rafters then take the measurement this way.

The most precise way to find the roof s slope is by measuring it from the underside. Slope gradients are written as y x where y is a single unit in rise and x is the run. Measuring the slope from the rafters. The maths behind this number is that it is the square root of rise run 2 1.

You can go by the measurements taken by walking the roof. A speed square and level can be used to easily find the pitch of a roof. A roof that rises 8 feet over a 24 foot span was said to have a 1 to 3 pitch. 0 pitch 1 00x the roof area.

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. This is read as a one in twelve slope. Both numbers must use the same units. Since this is a flat roof or nearly flat roof.

The pitch of this roof is 4 8 12. Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope. Measure with a speed square. 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.

Minimum roof slope roof pitch r905 9 1. 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. Calculating a slope gradient. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

Roof pitch calculator results explained. An example for a steep sloped roof is 8 12. 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. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less.

To put it in perspective the angle of this slope would be around 30 degrees. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator. The calculator above can handle much of this math.