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If there is one aspect of building that confounds most contractors, it's properly sizing structural components. Poorly drawn plans, conflicting building codes, confusing span tables, and a lack of understanding of basic principles can add up to sagging roofs, bouncing floors, or even unsafe structures. A computer is no substitute for the knowledge and experience of a good structural engineer, but with software like StruCalc, you can do some of the preliminary work — and chop hours off your engineering bill. Using StruCalc, a contractor or designer with basic structural knowledge can select component sizes with confidence, or use the program to check pre-drawn plans for accuracy before submitting them to an engineer or building department. StruCalc 4.0 ships on a