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    Kevin Griendling

    Hi Aleksander,


    Neither Building Construction Illustrated nor Fundamentals of Building Construction; Materials and Methods makes any mention of why the double tee span is shorter.

    They both, however, do callout the fact that the double tee design is newer and is the preferred design to use since it does not require extra support from tipping during erection. It is a more efficient design for the process of construction.

    If I could take a guess I would assume the weight of the extra concrete in a double tee in the near the neutral zone of the member (non-structural action) would be the cause of its lower span capability.


    Hope this helps,


    Kevin Griendling, AIA 

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