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Steepness.
How cut up is it. ie, a lot of valleys.
High number of valleys equals more waste.
Your insurance carrier 'should' have the number of total squares, 10x10, in their records.
Fyi: Be wary of the really low and high bids. Too low means they will likely surprise you later. The really high bid means he really doesn't want the job unless he can high gross you.
What is under the tiles?
Old composite over decking?
Decking only?
Slats?
Peek in your attic...
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Crazy Diamond
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