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\ <br /> (� Metal and/or precast support piers shall be installed on a base or footer of a minimum <br /> size of 4" x 16" x 16" solid concrete or other material approved and listed by the department. <br /> (See Figure C) <br /> (g) Metal and/or precast support piers shall be restricted to a maximum four inch(4") <br /> locking mechanical height adjustrnent and shall be restricted to a maximum height of not more �� <br />� than twenty-four inches(24")measured from the ground base or footer. This twenty-four inch <br /> (24")maximum shall not include the four inch(4")mechanical extension or adjustrnent. <br /> Exception: Center line or perimeter supports are permitted to exceed the twenty-four inch(24") <br /> maximum. (See Figure C) <br /> (h) The minimum distance between the fuushed grade under all new and used <br /> I mobile/manufactured homes and the bottom of the I-beam shall be eighteen inches(18"). Where <br /> the grade is sloped,twenty-five(25%) of the lowest member of the main frame may be set below <br /> eighteen inches (18"); however,under no circumstances may the bottom of the I-beam be set - <br /> below twelve inches(12") from the finished grade. <br /> (2) Foundations: <br /> (a) Concrete pads or foundations shall be a minimum of two thousand five hundred <br /> (2,500)pounds per square inch(psi). <br /> b Plastic ads or foundations shall be tested in the lower fi ercent 50% of each <br /> � ) P fh'P � ) <br /> soil class. <br /> 10 <br />