Spreade Footing Embedment
Spreade Footing Embedment
(OP)
In past codes (UBC) there was a provision for interior isolated spread footings to be buried a minimum of 7" into the surrounding soil to prevent the footing from walking laterally in a seismic event and the supported column failing from the movement. I even believe there was a detail of this condition too. I cannot find such a provision in the current IBC, IRC, or ASCE7.
Did they hide it real well, or just eliminate it?
Did they hide it real well, or just eliminate it?
Mike McCann, PE, SE (WA)






RE: Spreade Footing Embedment
In Section R403 of the IRC, this specific condition is not addressed from what I can see. It only addresses exterior wall footings, and isolated spread interior footings with a slab.
Am I reading this correctly?
Mike McCann, PE, SE (WA)
RE: Spreade Footing Embedment
However, the IBC (1809.4 & 2304.11.2.7)seems to say that the minimum depth of embedment for an isolated spread footing, regardless of frost, is 12 inches, and that the wood posts framing to the footing must either be PT, where the vertical distance soil to wood is 0", or 8" when the wood column is not treated. This would give a minimum interior spread footing depth of 12" or 18", depending on the wood column used.
Am I reading things correctly here?
Mike McCann, PE, SE (WA)
RE: Spreade Footing Embedment
As you can see from this, the codes have no real continuity or cross relation....a problem.