N.H. Code Admin. R. Inst 703.09
(b) Every pier shall be supported by a footing of the following type:
(1) A pad which shall be a monolithic concrete slab with Fibermix, 3000 pounds per square inch minimum reinforced with 4 rows of number 4 rebar spaced evenly in the first 4 feet of the outer edge with a bullfloat finish and complies with the following:
d. Shall be at minimum as set forth in Figure 700-3; or
Figure 700-3 Slab Specifications
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Source. #14221, eff 2-25-25