How To Find The Square Foot Of A Roof

Roofing Estimator

The following tools estimate the area of a roof, equally well as the amount of materials necessary to construct a roof of a given expanse. The "House Base Area" is the area of land that the house covers, and for more circuitous shapes, it can exist estimated using the Area Calculator.

Roofing Area Estimator

Roof Angle

House Base of operations Area
Roof Pitch	°
Eaves Stick Out
Price (optional)

Roofing Textile Calculator

Roof Surface area

The calculated area is merely an estimation. In cases where a roof has a complex shape, such as in the epitome to the right, measuring the dimensions and areas of each part of the roof to calculate the total area will issue in a more authentic measurement of surface area. The calculator cannot account for complex shapes based on a measurement of foursquare footage lonely. The Area Reckoner can be used to calculate the area of a diverseness of simple shapes that together can comprise the area of the roof. Using the amass area of these uncomplicated shapes tin yield a more authentic roof surface area to be used with the Roofing Cloth Estimator.

The nearly common roofing materials used in the United States include shingles, membrane roofing, and ceramic tile, all of which have unlike life spans. Shingle roofs typically have a life span of 15-30 years, while membrane roofs usually last five-fifteen years. Although ceramic tile roofs are expensive, they can have a life span of over 100 years.

Roof Pitch

Roof pitch is the measurement of a roof's vertical rise divided past its horizontal run. Information technology is often compared to slope, just is not exactly the same. In the U.s., a run of 12 inches (1 human foot) is used, and pitch is measured as the rise of the roof over 12 inches. For instance, a 7/12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Exterior of the U.Southward., a caste angle is typically used.

Roof pitch is a determining factor for the cost of the roof, also as the roof area, and the type of materials used. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to take steeper pitches.

Roof pitch affects the actual area of the roof. Depending on whether the roof area is measured horizontally (possibly from a drawing or photograph), a correction gene is necessary to decide the actual area of the roof. Given pitch and a horizontal surface area measurement, multiply the horizontal area by a correction factor corresponding to pitch, provided in the table below, to make up one's mind the bodily expanse of the roof to be used in the Roofing Material Calculator. While it is possible to judge the amount of necessary materials using but the total roof surface area measurement, as can be seen from the table, depending on how large the pitch of the roof, the actual area of the roof tin can differ by up to ii.236 from the measured total area at a pitch of 24/12. Equally such, while it tin can exist cumbersome, measuring the area and pitch of each office of the roof and multiplying by the corresponding correction factor will upshot in the virtually authentic guess of necessary roofing materials.

Typical Gradient Correction Factors:

Pitch	Angle	Multiply Past	Pitch	Angle	Multiply Past
i/12	four.eight°	1.003	two/12	9.5°	i.014
3/12	14.0°	one.031	4/12	18.iv°	1.054
v/12	22.half-dozen°	1.083	6/12	26.6°	1.118
7/12	xxx.3°	1.158	8/12	33.vii°	1.202
9/12	36.9°	1.250	10/12	39.8°	ane.302
11/12	42.five°	i.357	12/12	45.0°	1.414
13/12	47.3°	1.474	14/12	49.4°	one.537
15/12	51.three°	1.601	16/12	53.1°	1.667
17/12	54.8°	i.734	xviii/12	56.3°	ane.803
xix/12	57.7°	one.873	20/12	59.0°	1.944
21/12	60.3°	2.016	22/12	61.4°	2.088
23/12	62.iv°	ii.162	24/12	63.four°	2.236