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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 19 <br />7.2 FOOTING DIMENSIONS AND ALLOWABLE BEARING CAPACITY <br /> <br />Provide minimum footing dimensions as follows: <br /> <br />Table 4 <br />Minimum Footing Dimensions <br /> <br />Footing Type <br />*Minimum <br />Depth (in.) <br /> <br />Minimum Width (in.) <br />Continuous 18 18 <br />Isolated 18 18 <br />*below lowest adjacent pad grade <br /> <br />Minimum footing depths shown above are taken from lowest adjacent pad grade. The cold joint <br />between the exterior footing and slab-on-grade should be located at least 4 inches above adjacent <br />exterior grade. <br /> <br />Design foundations recommended above for a maximum allowable bearing pressure of <br />3,000 pounds per square foot (psf) for dead plus live loads. Increase this bearing capacity by <br />one-third for the short-term effects of wind or seismic loading <br /> <br />The maximum allowable bearing pressure is a net value; the weight of the footing may be <br />neglected for design purposes. All footings located adjacent to utility trenches should have their <br />bearing surfaces below an imaginary 1:1 (horizontal:vertical) plane projected upward from the <br />bottom edge of the trench to the footing. <br /> <br />7.3 WATERSTOP <br /> <br />If a two-pour system is used for footings and slab, the cold joint between the exterior footing and <br />slab-on-grade should be located at least 4 inches above adjacent finish exterior grade. If this is <br />not done, then we recommend the addition of a waterstop between the two pours to reduce <br />moisture penetration through the cold joint and migration under the slab. Use of a monolithic <br />pour would eliminate the need for the waterstop.