Did you know that even in the middle of a hot, humid Omaha summer, commercial foundations still have to go just as deep as they would in January? Omaha’s building code requires footings to extend at least 42 inches below the finished ground surface, per the city’s municipal code, the depth needed to get below the frost line that forms most winters. When moisture in the soil freezes and expands, the resulting frost heave can generate lifting forces as high as 50,000 pounds per square foot in extreme cases, more than enough to crack a slab or shift a foundation if footings aren’t placed deep enough.
It might seem unintuitive to dig down that far for a summer construction project, but the code doesn’t adjust for the season the work happens to take place in. A building’s foundation has to perform through every winter it will ever see, not just the one it was poured in.
If your business is planning an addition or new commercial building this summer, this is one of the details your contractor should already be accounting for in the site plan, regardless of how warm it is outside right now.