it depends on how tall and wide your roof is (varys from person to person)
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18-ft x 11-ft = 198 square ft
960 sq. ft.
assuming standard sheet is 4 x 8 = 32 square feet roof is 29 x 45 = 1305 sq ft you need 1305/32 = 41 sheets
16-ft x 70-ft = 1,120 square feet