Architecture & Engineering

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What are common structural systems for long span garages?

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The two most common structural systems for long span garages are precast concrete (double tees) and post-tensioned concrete. Typical column bay spacings for precast parking garages are 36, 45, and 48 feet, with typical precast double tee spacing widths of 12 and 15 feet. Typical column bay spacings for a post-tensioned concrete garage is 24 feet. The depth of both of these structural systems is approximately 3 feet.

Another structural system is the Filigree Wide Slab (with Dropped Beams) system. Filigree is a combination of precast elements, and cast-in-place concrete topping. It is recommended that the spans be limited to 44 feet, with an intermediate column at 16 feet, for a 60 foot parking module. Column spacing in the other direction is a function of the number of parking spaces between, such as 20 or 28 feet.

*Federal, State, and Local codes govern most of these requirements and should be thoroughly investigated. Data presented herein should be considered guidelines only.  For more specific information and assistance with implementation of these guidelines, please contact THA Consulting, Inc. via email at

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