How can I calculate covered area under a single-slope roof?

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I'm looking to build a small covered patio area on our property, next to our pool. It'll be open on all sides, and covered by a simple skillion/single-sloped roof. So something like in this photo:

http://fancycribs.com/wp-content/uploads/2011/03/Broadford-Farm-Pavilion-LakeFlato-Architects-600x402.jpg

The idea behind the single sloped roof is that we'd like to be able to put a bunch of PV panels up there to generate some solar energy.

So my question is this: how can I combine the roof dimensions, with the angle/pitch of the roof, to determine the amount of area that will actually be covered? Suppose the roof is 20 feet long by, say, 15 feet wide. If it were flat that would be easy. But if the roof is angled at say, 30 degrees, then that will change the actual area of the space below that the roof actually covers. How would I go about calculating that exactly? I'm really not even sure where to start on something like this.

Any help would be greatly...

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I'm looking to build a small covered patio area on our property, next to our pool. It'll be open on all sides, and covered by a simple skillion/single-sloped roof. So something like in this photo:

The idea behind the single sloped roof is that we'd like to be able to put a bunch of PV panels up there to generate some solar energy.

How can I combine the roof dimensions, with the angle/pitch of the roof, to determine the amount of area that will actually be covered? Suppose the roof is 20 feet long by, say, 15 feet wide. If it were flat that would be easy. But if the roof is angled at say, 30 degrees, then that will change the actual covered space below it. How would I go about calculating that exactly?

Crossposted to...

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Understand roof pitch.

Technically, roof pitch is the ratio of

total

vertical roof height (the rise) to

total

horizontal distance from wall to wall (the span).

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Although most homeowners do not need to measure pitch, it still pays to understand this term. When you're arranging for repairs or roofing material, your calculations will be way off if you misinterpret "pitch" to mean "slope."

Again, some carpenters and manufacturers use both terms to mean "slope." Just ask if there's any confusion about which measurement they're referring to. For example, if a roof is 32 feet from wall to wall and the ridge is 8 feet above the walls, the pitch has an 8 to 32 pitch, simplifying to "1 to 4" or...
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Gallery of roof pitch angles

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How to Determine Roof Pitch


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Roof Pitch Calculator


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Roofing Calculator


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Roof Pitch Interactive tools » Roof Pitch Calculator


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So you're thinking of reroofing the house yourself and want an estimate for how much roofing material you'll need, but you don't want to go climbing around with a tape measure and scare your spouse half to death. You're in luck, because math can rescue you from pulling out that ladder and tape measure.

Divide your roof pitch by 12. Roof pitch is given as the number of inches in height change over the distance of one foot. Dividing by 12 gives the ratio of inches in rise per distance. For example, a standard roof pitch is likely to be about 4. So for a pitch angle of 4, divide by 12 and get 1/3.

Square the result of Step 1. So keeping with our roof pitch of 4 this gives us 1/9.

Add 1, then take the square root. Adding 1 gives us 1 + 1/9 = 10/9, then taking the square root gives us about 1.0541.

Multiply by the square footage of a single floor of your house. So continuing our example, if you've got a two story house with a total square footage of 2,700...

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This calculator will help you determine the amount of square feet you have for replacing roof shingles. Roof shingles are figured by number of squares. 10'x10' = 100sf (1 square)

Roof Area Calculators: GABLE & HIPSHED
For each of the roof types pictured below, L = horizontal Length, W = horizontal Width, and H = vertical Height, all entered in feet. Slope in inches per foot may substituted for H. (If you do not know how to measure slope, see these instructions.)

Hip roofs can present a problem for height measurement, and the slope method may be substituted in place of height measurement. Since modern architecture has allowed the incidence of mixed slopes in a single structure, the calculator allows for entry of differing slopes for intersecting roofs.

For many roofs, dimensions can be taken from the ground or from a ladder. Be sure that your measurements include any overhang at the eaves. Height can often be measured at the end wall at the...

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How to calculate the area of the roof: important nuances

At the preparatory stage of the calculations necessary to carry out a number of activities:

originally recommended to prepare a plan of the building roof in terms of its inclination second step is measurement of construction tape.It is advised to resort to certain programs on the calculation that allows to obtain the most accurate data Based on the results of measurements should determine the type of roofing

often used for a long time tested formula for the calculation of the size of the roof plane.Considering the most common form of triangular rays, should apply the formula of the science of geometry.

originally measured the angle of the ramp.He is a major in subsequent computational processes.Consider the roof slope coefficient:

angle of 9 degrees is 1,01 coefficient of 14 degrees is 1, 03 At 18 degrees - 1,05 23 degrees angle has a coefficient of 1,08 angle of 27...
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The roof slope, which is often called the "roof pitch," can be expressed in many different ways. In the United States, pitch is usually expressed as the rise of the slope over 12 inches. A roof that rises 4 inches over a 12-inch run would have a pitch of "4:12." Sometimes 1 foot is used instead of 12 inches, and in this case, the roof will simply be called a "4 pitch" roof. In other parts of the world, the slope angle, written in degrees from horizontal, is used. Some roof styles, like the gambrel, will have more than one slope angle.

Place a ladder near or against the building so you can have easy access to the roof. Climb the ladder and bring along a level and ruler or tape measure.

Place the level on the roof lengthwise. The level should be at least 1 foot in length. If it is longer, then there should be a 1-foot mark from either end. The end you measure the 1 foot from should be on the high side when you place it on the roof.

Lift the low side of the level...

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[Summary]How to determine the slope of a roof http://www.learningconstruction.com Step by Step Tutorial: This video will explain how to determine the slope on a roof. Slope is normally described by the r... Roofing Calculator Roofing Calculator Use the follow

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How to determine the slope of a roof


http://www.learningconstruction.com Step by Step Tutorial: This video will explain how to determine the slope on a roof. Slope is normally described by the r...

Roofing Calculator

Roofing Calculator

Use the following tools to estimate the area and the materials needed for the root. The "House Base Area" is the area of the land the house covers. When measuring, be sure to include the eaves covered areas. Our area calculator can be used to estimate the area coverage of the house. If the house is irregular in shape, you can divide the house covered area into a few simple shapes and add their area...

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So it’s time for a new roof, or perhaps you are planning a new home construction project and are considering what your new roof should look like. Surely, you have heard about all the exciting new roofing materials available today and are eager to get started. But, before you can make the call on what to put on the roof, you need to know the pitch or slope of the...

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Use the following tools to estimate the area and the materials needed for the root. The "House Base Area" is the area of the land the house covers. When measuring, be sure to include the eaves covered areas. Our area calculator can be used to estimate the area coverage of the house. If the house is irregular in shape, you can divide the house covered area into a few simple shapes and add their area together. The roof pitch defines the steepness of the root. It can be measured or can be estimated via by comparing your roof with our images.

Roofing Area Calculator

Roofing Material Calculator

Free Estimation of Your Roofing Project >>

References:

The area we give out is estimation only. If the roof of your house has complex shape like the one in the right, the most accurate way is to measure all the dimensions and add the areas of all surfaces. You can use our area calculator to calculate the area of each surface. The most common roof materials in...

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How Roof Area Is Calculated

Area is defined as the expanse or measurement of a given surface, and there are a few methods for measuring your roof’s area. Our roof calculator uses “base length” and “base width” to find the estimated area. The base width is the distance from one corner of your roof to the other, at its base, on the short side of your house. The base length is simply the distance from the second corner to the third corner, on the house’s long side. Our calculator rounds up to the nearest foot, so you can do the same when measuring. See the image below for a visual guide on how to measure your roof’s base length and width.

How Roof Pitch is Calculated

To accurately calculate the area of your roof, you must first determine its slope, or pitch. A roof's pitch is determined by how much it rises vertically for every foot it runs horizontally. Thus, a moderate “6 in 12” roof pitch means that the roof rises 6 inches vertically for every 12 horizontal...

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How do you calculate the height and slope of a roof cricket? It is crucial to the height of the parapet and the roof is a 2:12 so not talking inches here.

I need the main roof sloping at 2:12, then I am cricketing towards some scuppers. I have the cricket "fold" lines at 45 degrees in plan which I think is correct, and this valley must maintain the minimum 2:12 slope for the roofing product to maintain warranty.

What I need to know is how to calculate the roof slope of the cricket to get this 2:12 and also how high up the cricket will be going as my parapet will need to cover it. By the way, the parapet top height is not the same all around, it must be lower where said cricket will occur, thus a critical moment and thus such a question.

Oct 11, 06 7:24...

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