The two most important factors in calculating cost are the style of roofing and the shape and pitch of the roof.
Many roofing and siding products are bought and sold by the square. One square is equal to an area that measures 100 square feet. This simple change in unit of measure could create a large error if the estimator is not observant.
Accessories necessary for a complete installation must be figured into any calculations for both material and labor.
2011 Building Construction Cost Data Book
Thousands of unit costs for building components, arranged in the new CSI MasterFormat® 2010 classification system
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