30.
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
The weight of concrete roof tiles can vary, but on average, they weigh between 9 to 12 pounds per square foot. Therefore, 100 square feet of concrete roof tiles would weigh approximately 900 to 1,200 pounds. It's important to check the specific weight of the tiles being used for a more accurate calculation.
per roof square.
The [perfect] square of 900 is 810000
99.7
Unless you have a flat roof, no; the surface area of the roof will be larger than the ground area of the building.
900 square inches = 0.694 square yards.
There are 144 square inches in one square foot. Therefore, 900 square inches is equal to 900/144 = 6.25 square feet.
900 square feet = ~83.6 m2
There are 9 square feet in one square yard. Therefore, 900 square yards is equal to 900 x 9 = 8100 square feet.