100 sq ft = 1 square.
The same as it is anywhere else on the house. A square is 100 square feet. It is a measurement that is used with siding or flooring also.
If you mean square feet, there are 100 square feet in a square. So 20 squares is 2000 square feet.
100 sq ft = 1 square.
500 square would be 50,000 square feet. Not knowing in what context this is used, it could be that it should read or mean 500 square feet which would be a small roof. 50,000 is a very large roof. Shingles are figured in squares. 1 square is 100 square feet made from 3 bundles of shingles on average. That is just how a roof is figured so that there is a common reference point.
A roofing square is 100 square feet of materials.
100 sq ft = 1 square.
One square = 100 sq ft of roof area.
A square, roofing, siding, flooring is 100 sq. ft. A framing square is 16 inches by 24 inches.
The same as it is anywhere else on the house. A square is 100 square feet. It is a measurement that is used with siding or flooring also.
The roofing industry speaks of a "square" as meaning 100 square feet. So, if your contractor says your roof is about 9 squares, he means it will require about 900 square feet of materials in order to cover the surface area of your roof.
The professionals get up on the roof and use a tape measure. One square = 100 square feet.
Generally there is 1/3 of 1 square per bundle but this varies with style and manufacturer. a square covers 100 square feet of roof so 1 bundle would be roughly 33 square feet.
26 square feet? That is not a roof that is a patch. 5' X5' is 25 square feet, so a minimun job call for a roofer, about $100
You measure the roof to get the square feet. There are 100 square feet in a square. On a straight single peak roof it's height times length on one side and double it. Then divide the total square feet by 100. This final number will give you the number of squares you have. If the roof is a flat, commercial roof, it is the same (100 sq. ft = 1 SQ). However, if it is a metal panel commercial roof, you need to add in "stretch factor" or the added amount of square footage if the panels were to be stretched flat. A good estimate for this is: If the ribs on the metal panel are 1" tall, add 10% to your square footage; if the ribs are 1.5" tall, add 15% to your total square footage. So, if you have a metal roof that is an R-panel (_/-\_), the ribs are 1.5" tall and the roof is 100 SQ (or 10,000 sq ft), take 10,000 sq ft + 15% (1500) = 11,500 sq ft (115 Squares).
If you mean square feet, there are 100 square feet in a square. So 20 squares is 2000 square feet.
One bundle of shingle covers about 33 square feet of roof hence around 850 bundles of shingles will be needed for 28000 square feet roof!