R507.3.2

Section R507.3.2 is titled 'Minimum depth' and covers the requirements for deck foundation depth into the ground. A minimum depth, which is below the frost line is established. The purpose of this section is to prevent structural failure. The section has 2 exceptions which allow for free-standing decks to not have footings which extend below the frost line. The purpose of these exceptions is to clarify that such structures are considered to be a low risk hazard and thus allowed.

The model shows a section of ground with a plane representing the frost line depth and a concrete deck pier which extends into the ground, to below the frost line plane.