United Steel Deck - Maximum Unshored Span Calculation

Maximum Unshored Span Calculation

These calculations for maximum unshored spans are based on The Steel Deck Institute construction loading for typical applications. If your job has different construction loading conditions, these calculations may not be suitable. In no case is the provided information meant to replace the calculations or judgement of the engineer of record.

For most applications, spans less than 6 feet will most effectively use deck that is 1½" or less in depth; for spans less than 9 feet, 2" deck; for spans greater than 9', 3" deck. However, the total concrete thickness may dictate the deck choice.
span conditions

Ponding is to be used if the designer contemplates additional loading from frame deflections. If all beams are cambered the ponding allowance might be 0%; if there are long beam spans and no cambering, the ponding might be greater than 10%.

If you wish to review the SDI Formulas for Construction Loads before running the calculation program refer to page 17 of our Steel Decks for Floors and Roofs manual or click here.

For more information email our engineering department.

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	These calculations for maximum unshored spans are based on The Steel Deck Institute construction loading for typical applications. If your job has different construction loading conditions, these calculations may not be suitable. In no case is the provided information meant to replace the calculations or judgement of the engineer of record.