One inch of rain over one square foot is 1/12 cubic foot of water. A cubic foot of water weighs about 62.4 pounds. 1/12 of that is about 5.2 pounds.
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Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
75 tiles would do it (a 12*12 inch time = 1 square foot) but you need 10% over this for waste so you need to get 83 tiles.
1 square foot = 144 square inches. 3/4 square foot = 108 square inches.
Over 9,000.
26X26 = 676 and that's the square inches in each tiletake the 676 divide by 144 (sq inches in a foot) and you get. 4.7 sq feet per tile.And since each tile is just over 2X2 that makes sense that it would be over 4.