Slope Factor For Area Of Roof

A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.

Slope factor for area of roof.

For multi pitched roofs simply add the areas of all common pitches together by toggling layer visibility from the summed layer identified by the. 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. Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof with the same slope.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Roof pitch affects the actual area of the roof. To obtain an accurate roof pitch measurement properly measure the rise and run.

A 12 in 12 pitch is a. All you need is a simple trigonometry equation and a calculator that has a square root button. If you need to find out the area of the roof such as to purchase roofing knowing and using the factor will assist you greatly in determining the exact square footage. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area.

Then you ll be able to measure slope from an unfinished attic space under the roof. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

Divide the rise by the run the run is 12. The headache of using pythagoras and trigonometry can be spared by making use of these charts. Feet the area of a hip roof equals the area of a gable roof with the same dimensions. Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

To accurately calculate the area of your roof you must first determine its slope or pitch. So in this case for every 12 inches the roof goes across horizontally b while rising 6 inches a there s actually 13 416 inches of roof c. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.