-9: Pier Footings

-9: Pier Footings A. Every pier shall be supported by a footing. All I-beam support piers and marriage line support piers shall be constructed on footings of solid concrete not less than 16 x 16 inches that consist of a 4-inch-thick concrete pad, precast, ABS, or poured in place concrete slab, unless other footing types and sizes are allowed. All footings are to be placed on stable undisturbed soil or properly compacted fill material. The fill material must be compacted to 90 percent of maximum relative density to adequately provide the proper load bearing capacity for the support pier footings. B. Perimeter pier footings are required to be a 4”x 8”x 16” concrete pads or equivalent size ABS pads. C. Prepare the surface of the footing making sure the top surface of the footing upon which the pier will be installed is level, flat and smooth. D. Poured-in-place concrete runners used as footings for a new Factory-Built shall meet the guidelines of the manufacturer’s installation instructions. For all used Factory-Built homes the concrete runners shall be eight (8) to twelve (12) inches thick with a 28-day compressive strength of 3,000 pounds per square inch (psi) and shall be required to contain proper reinforcing steel. For 3000 psi concrete, it is generally recommended to wait at least 28 days before applying significant weight, as this is the standard curing time for concrete to reach its full strength and achieve optimal durability. However, it is recommended to consult with a local concrete supplier or local building code office for determining accurate periods of cure time required before setting up a Factory-Built home on the poured concrete slab or runners. E. If an existing concrete slab is to be used as the foundation of the home and the thickness and the existence of reinforcing steel cannot be readily determined, all I-beam support piers shall be required to be placed on solid concrete footings, 4 x 16 x 16 inches, or equivalent size ABS pads. In addition, the top elevation of the existing concrete slab shall be a minimum of 4 inches higher than the existing grade of the soil around the slab.