Mich. Admin. Code R. 408.30522 - Minimum depth
Rule 522.
Section R403.1.4 of the
R403.1.4. Minimum depth. All
exterior footings and foundation systems shall extend 42 inches below actual
grade . Where applicable, the depth of the footings shall also conform to
section R403.1.4.1 of the code .
Exception:
Upon evidence of the existence of any of the following
conditions, the
(a) Freezing temperatures
(freezing degree days).
(b) Soil
type.
(c) Ground water
conditions.
(d) Snow depth
experience.
(e) Exposure to the
elements.
(f) Other specific
conditions identified by the building official that may affect the foundation
system .
Notes
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