Section R. 408.30449 - Frost protectionRule 449. Section 1809.5 of the code is amended to read as follows:
1809.5. Frost protection. Except where otherwise protected from frost, foundation walls, piers, and other permanent supports of buildings and structures shall be protected from frost by at least 1 of the following methods:(1) Extending not less than 42 inches (1 067 mm) below finish grade.(2) Constructing in accordance with ASCE-32 listed in chapter 35.(3) Erecting on solid rock. Exceptions:
1. Free-standing buildings meeting all of the following conditions shall not be required to be protected:a. Classified in risk category I in accordance with section 1604.5 of the code.b. Area of 600 square feet (55.74 m2) or less for light-frame construction or 400 2 square feet (37 m) or less for other than light-frame construction.c. Eave height of 10 feet (3 048 mm) or less.2. Upon evidence of the existence of any of the following conditions, the building official may modify the footing depth accordingly:a. Freezing temperatures.c. Groundwater 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. Footings shall not bear on frozen soil unless such frozen condition is of a permanent character.
Mich. Admin. Code R. 408.30449
1979 AC; 1981 AACS; 1985 AACS; 1988 AACS; 1992 AACS; 1995 AACS; 2001 AACS; 2004 AACS; 2008 AACS; 2010 AACS; 2014 AACS