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SOILS AND FOUNDAAl10NS Gradient, load intensity and erasion characteristics of slope 180542 ..3 Plain concrete f Materiel ootings. The edge thickness Of plain concrete food supporting walls of other than l 805 . 4 Footings shall be designed an constructed in Light -frame construction shall not be Tess that 8 inches Allowable bearing capacity of the soil is not ex (203 mm) where Placed on soil. That di ceeded, and n concrete footings supporting Exception: For plain �erential settlement is minimized. The minimum is per mis- Width of footings shall be 12 inches (305 mm) Group R -3 occupancies. the edge thickness is t ted to be 6 inches (152 mm),provided that the footing Dom not extend beyond a distance greater that the Footings to areas with expansive soils shall be designe Wall. d all. of the footing , either side of the supported accordance with the provisions of Section 1805.8. 1805.4,2,4 Placement of concrete. Concrete footings ' Shall not be placed through wai'.r unless a trtmie or other 18 05.4./1.1 Design loads, Footings shall for the most unfavorabk effects due to the combinations of clashed approved by the building ;fficial is used, Where loads specified in Section 1605.3. The dead load shall in- Placed under or in the presence of wooer„ the loads s he weight of fc i odations„ footings and d shall i shall be deposited CO mini by approved means to le t urn J i fill. Reduced live loads, as specified m Section 1607.9. mum segregation of the mix and negligible turbulence 01 Are pitted to be used in designing footings. the water. 1805,4.1.2 Vibratory loads. When machinery pore. bons or other vibrations are throe the 1805.4.2.5 Protection of concrete. Concrete footings foundation, consideration shall be given in the footing shall be protected from freezing during depositing and for design to prevent detrimental distu ces of the soil. period of n less than five days thereafter. Water shall Not be allowed to flow through the deposited coocreu 1805.4.2 Concrete footings., The design, materials and con- struction of concrete footings shall comply with Sections permuted t Forming g nst h to. Concrete f in t h are 1 805.4.2.1 through 1805.4.2.6 and the provisions of Ch permitted to be coot against conditions earth where, in the opin- ter 1805.4.2. aP ion of the building official, soil conditia do not require forming. When forming b required, it shall be in dance with °Copt Exception: Where a specific design u not provided, corn - a 6 of AC1318. Crete footings supporting walls of light -frame construc- tion art permitted t be designed in accordance with 1805.4.3 M otion o m footings. The design, h materiels Table 1805.4.2 and construction of masonry -unit footings shall comply with Sections 1805.4.3.1 and 1805.4.3.2, and the provisions 1 805.4 2.1 Coocrttc Of Chapter 21. 180 hav 5 a to strength. Coocrete in footings Sons than 2a specified coind �pr+essive strength (f c) of not per square inch (psi)(17 237 kPa) so iy.. unit footings s Where s u ng design wal s of light - is not provided, n- - At 28 days. my -unit -frame con- struction are permitted to b designed in accordance with 1805.42.2 Reserved, Table 1805.4.2. 1805.43.1 Dim laid in Type M or S mortar Plying Masonry-unit footing shall be with Section FOOTINGS SUPPORTING W TABLE 1805.4.2 ALLS OF LIGHT-FRAME CONSTRUC11ONa.b.c.d NUMBER OF FLOORS WIDTH OF THICKNESS OF FOOT SUPPORTED BY THE FOOTINGS• FOOTINGS FOOTING • (inches) (inches) 6 6 3 For S I 1 inch = 8 25.4 mm, I foot - 304.8 mm. a Depth of footings shall be in accordance b The divine under the Boor is permitted to Section 1805.2. c o be excavated to the elevation of the top of the footing ih table a e isolated pd to be supported by footings. The footing width and I footings shall be spaced not more than 6 Feet on center. C°� shall be twice d. For thickness of foundation walls, see Section 1805.5. c Footings art permhtd to support a roof in addition to the stipulated number of floors F Shall be as required for supporting one floor. °O gs supporting roof only f Plain concrete footinfgs for Group R -3 occupancies art permitted to be 6 inches thick