If the roof has equal pitches [both sides same size] Multiply the length of the roof by length of truss [take size from gutter to ridge] multiply these two sizes in feet then double the answer. that will be your answer.
Unless you have a flat roof, no; the surface area of the roof will be larger than the ground area of the building.
The site below that explains the pitch - how to measure it with a calculator to use with pitch and calculate the total footage of your roof
To find the sq. ft of a roof you have to measure the length and the width and multiply those figures together. Then you divide that figure by 100 and it will tell you how many squares of shingles it will take to cover it.
Multiply by 144
a roofing square is 100 sf. There are formulas out there that allow you to use the pitch and outer dimensions of the roof to figure out the number of squares. If not, calculate the square footage and divide by 100 - that's the number of squares you have...
Unless you have a flat roof, no; the surface area of the roof will be larger than the ground area of the building.
That really depends on several different variables including the square footage of the roof itself and the size / type of the tiles being used. Most of the time when buying roofing tiles / shingles it will state on the packaging how many square's it will cover. It should also state the "square footage" covered as well. So once you have your square footage you can then figure out how many tiles / shingles it will take to cover your roof. Don't forget to add 10 to 15% for waste in your calculations.
measure the square footage first. one square of shingles (3 bundles) covers 100 sqft. divide the square footage by 100 and that's how many squares of shingles you need (be sure to buy enough extra to cap the roof with and compensate for waste at the ends. (starter and ender shingles)
length x width of each roof segment.
The site below that explains the pitch - how to measure it with a calculator to use with pitch and calculate the total footage of your roof
If you do not have access to a roof framing book, I would use a tape and measure it. Length x width = square footage. My book says you should come up with : 11.33 x 12 = 135.96 sq ft
315
To find the sq. ft of a roof you have to measure the length and the width and multiply those figures together. Then you divide that figure by 100 and it will tell you how many squares of shingles it will take to cover it.
Multiply by 144
a roofing square is 100 sf. There are formulas out there that allow you to use the pitch and outer dimensions of the roof to figure out the number of squares. If not, calculate the square footage and divide by 100 - that's the number of squares you have...
To figure out the square footage of this odd sized room, you simply need to multiply the numbers. The answer is 2720 square feet.
Use the square footage of your house, and the size of your roof should be about the same. Be carefull not to include the yard in the footage or anything that is not covered by the roof, then divide the number by the number of stories your house is.