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.
I just cheecked the web but I saw no such thing as a 900 square feet trailer. You may want a professional to take a look.Sorry I couldn't help you that much. :(
what is the cost of a roof per square foot
per roof square.
The [perfect] square of 900 is 810000
900 square inches = 0.694 square yards.
Unless you have a flat roof, no; the surface area of the roof will be larger than the ground area of the building.
99.7
There are 144 square inches in one square foot. Therefore, 900 square inches is equal to 900/144 = 6.25 square feet.
There are 9 square feet in one square yard. Therefore, 900 square yards is equal to 900 x 9 = 8100 square feet.
900 square feet = ~83.6 m2
When talking about the area of a roof, remember that it is not the same as the square footage of the structure. For example a 20 x 30' building with a 12" overhang and a 4/12 pitch will have 736 sq ft of roof vs only 600 sq ft of slab. One square of shingles covers 100 square feet. 15 year shingles come 3 bundles to a square. 25 year come 4 bundles to a square.