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**Floor Joist Count**: Computes the number of joists (joists and end plates) and joist ties required for a floor or deck based on the dimension of the room or deck and the on-center joist separation.**Floor Joist Cost**: Estimates the cost of Floor Joist boards (joists and end plates) required for a floor or deck based on the dimensions of the deck, spacing of joists and unit cost of joist boards.**Joist Hanger Count**: Computes the number of joist hangers required for a deck based on the width of the deck and the spacing of joists.**I-Joist Count**: Computes the the number of I-Joist boards required to cover a span (width) based on the size of the span and spacing of the I-Joists.**Maximum Joist Span**: Computes the span length of a (1,200 pounds per square inch fiber stress) wood joist based on the live load, spacing, board width (e.g., 2x6 vs 2x10) and whether the joist need to be extra stiff for materials attached such as plaster below them.**Joists on Beams**: Computes the number of joists (2x dimensional lumber or i-joists), number of beams, number of joist hangers, and length of plate boards needed for a floor or deck with a span that might require one or more beams.