1 8 Roof Slope

Slope gradients are written as y x where y is a single unit in rise and x is the run.

1 8 roof slope.

Both numbers must use the same units. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator. The pitch of this roof is 4 8 12. 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. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less. An example for a steep sloped roof is 8 12.

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. 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. The calculator above can handle much of this math. Minimum roof slope roof pitch r905 9 1.

Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope. You can go by the measurements taken by walking the roof. 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. Since this is a flat roof or nearly flat roof.

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. 0 pitch 1 00x the roof area. Roof pitch calculator results explained. Calculating a slope gradient.

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 that the rise of the slope goes up or down 8 inches for every 12 inches. Measuring the slope from the rafters. Access one of the rafters then take the measurement this way.

To put it in perspective the angle of this slope would be around 30 degrees. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. This is read as a one in twelve slope. Measure with a speed square.

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. The maths behind this number is that it is the square root of rise run 2 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.