Same way you would a garden. Linear foot measures. Length x width x 2.
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On house, why might a pyramid-shape roof be better than a flat roof?
Roof Protect Products Provide the Best Roof Coating for a Flat Roof & roof restoration Services in Florida State.
All roofs have a "pitch" even flat roofs have a pitch required to allow water to drain from the roof.
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This would depend entirely on the definition of flat, and its origin. Flat rooofs are not flat, and all should have enough slope to run water, generaly 1 to 2% minimum. In our area a flat roof is defined as any roof with less than 3:12 pitch and must have Ice and Water shield or other equivelant materials installed to prevent damage. Usually up to and including a 2:12 Pitch can be protected with a Build Up Roofing system or BUR roof. Another usual material is what we call a Single Ply or Membrane roof. These materials are like a big rubber inner tube being pulled over the roof and can be attached with ballast (rock) or mechanically. Most today are a white material but collored are available from some manufactures. ALWAYS check with your local building official for the actual definition and requirements in your area. Terry