Slope Factor For Area Of Roof

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

Slope factor for area of roof.

The roof slope factor chart also consists of conversion factors to determine the slope of the roof. 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. For multi pitched roofs simply add the areas of all common pitches together by toggling layer visibility from the summed layer identified by the. Feet the area of a hip roof equals the area of a gable roof with the same dimensions.

All you need is a simple trigonometry equation and a calculator that has a square root button. It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. To accurately calculate the area of your roof you must first determine its slope or pitch. 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. 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. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. 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 12 in 12 pitch is a. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. 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.

Now you re ready to price out the materials. 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. To obtain an accurate roof pitch measurement properly measure the rise and run. Roof pitch affects the actual area of the roof.

The headache of using pythagoras and trigonometry can be spared by making use of these charts. 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. Then you ll be able to measure slope from an unfinished attic space under the roof.