In any given project the total weight of open web steel joists is determined by the loads to be supported and the design.
However, economies can be realized in minimizing the amount of labor used to place the joists. This is done by maximizing the joint spacing, and therefore minimizing the number of joists required to be installed on the job. Certain spacings and locations may be required by the design, but in other cases maximizing the spacing and keeping it as uniform as possible will keep the costs down. The economies of needing fewer joists can well offset the costs of the larger or heavier joists that may be required to replace them.
Joist Bridging - It generally costs less to install joist systems that can utilize horizontal bridging (as opposed to cross or other types of bridging).
Plates and Connections - When estimating the total tonnage of structural steel, add 10% to the total weight to allow for plates, connections, and waste as a rule of thumb.
Shop-Applied Finish Paint - When the specifications call for the finish coat of paint to be applied prior to installation, allow considerable time for touching up the paint. Every time you lift, move, weld, bolt, or alter the position of a piece of steel, you will need to touch up the finish.
Read more metals estimating tips.
2013 Light Commercial Cost Data Book
Covers every aspect of light commercial construction pricing for a variety of building types
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2013 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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