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Yes, the 15.97 number is correct according to engineering equation above. (The 1.1 multiplier for scrap results in the 17.57 squares).
The house is in a high wind area since we are located at the base of a small moutain. Therefore, a high wind shingle is required. Another reason for considering other materials too (metal, slate, rubber [fake slate], etc).
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'75 914-6 3.2 (Track Car)
'81 SC 3.6 (Beast)
'993 Cab (Almost Done Restoring)
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