Slope Factor For Area Of Roof

Roof pitch affects the actual area of the roof.

Slope factor for area of roof.

It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. 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. All you need is a simple trigonometry equation and a calculator that has a square root button.

Then you ll be able to measure slope from an unfinished attic space under the roof. The maths behind this number is that it is the square root of rise run 2 1. To accurately calculate the area of your roof you must first determine its slope or pitch. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

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. 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. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.

Calculating the roof slope factor is not that difficult. A 12 in 12 pitch is a. Now you re ready to price out the materials. To obtain an accurate roof pitch measurement properly measure the rise and run.

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. 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. For multi pitched roofs simply add the areas of all common pitches together by toggling layer visibility from the summed layer identified by the. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Divide the rise by the run the run is 12. 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.