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SOILS AND FOUNDAA1lONS Gradient, load infrnsity and erosion characteristics of slope 18 05.42.3 Plain concrete f Material Of plain concrete foo 7be edge thickness than Light-frame walls of other than 1805 . 4 Footirtgs shall be designed an constructed in gh frame construction shall not be less that 8 inches capacity the soil is not ex (203 mm) where placed on soil. Allowable bearing That di oxded, and Exception: For plain concrete footings differential settlement is minimized. The minimum gs ess is p ng Width of footings shall be 12 inches (305 mm) Group R -3 occupancies. the edYO thickness is permit- tcd to be 6 inches (152 mm),provided that the footing Does cot extend beyond a distance greater that the Footings in areas with expansive soils shall be designed Thickness of the footing c tither side of the supported Wall. In accordance with the provisions of Section 1805.8. 1805.4.2.4 Placement of concrete. Come footings 1 805.4./ 1.1 Design loads Footings shall be des' Shall not be placed through wa►Pa unless a tremie or other the moo unfavorrbk effects due to the combinatio o f for toothed approved by the building it�cial is used Where loads specified in Section 1605. 3, The dead load shall in- Placed under or is the presence of water„ the concrete clued the weight oS footings d l d shall in- shall be deposit rnPprovc means tole turbulence lenc Arc Reduced live loads, as specified hi Section 1607.9. the segregation �On of the mix and negligible p�rbulcn� c l permitted to be used in designing footings, 1805 4.1,2 Vibratory 1 oads. Where machinery opera. pons or other vibrations arc transmitted through the 1 805.4.2.5 Protection of concrete. Concrete footings foundation, consideration shall be given in the footing e �aJl be Drote�ed from freezing during depositing and for design to prevent detrimental Vices of the soil. period of not less ow five days thereafter. con Water shall Not be allowed to flow through the deposited concrete. 1 805.4.2 Concrete footings, The design, materials and con- struction of concrete footings shall comply with Sections ermined t Forming g concrete. the rth where, f in t are 1805.4.2.1 through 1805.4.2.6 and the provisions of Ch Permitted to be east against the earth where. n the uj ter 1805.4.2, ap' ion of the building official, soil conditions do not firming. Where forming b require dance with 8� h shall be in steer_ Exception: Where a specific design u not provided, con- a 6 of ACI 318Exception: Crete footings supporting walls of light - frame construe- Lion are permitted to be designed in accordance with and construction o unfit footings. The footings materials Table 1805.4.2 and oorutruction of mawnry_ unit footings shall comply with Sections 1805.4.3.1 and 1805.4.3.2 and the provisions 1805.42,1 Of Chapter 21. Sha a specified strength. Concrete in footings hall have Less than a sp pounds compressive strength (f c) of not Per square inch (psi)(17 237 kPa) Exception: it Where a specific o r ti g wa is not provided, me- Al 28 days. ) sonny - unit footings supporting walls of light-frame con- struction are permitted to b designed in accordance with 1805.4 22 Reserved. Table 1805.4.2. 1805.4.3.1 Dimensions, Masonry-unit footing shall be laid in Type M or S mortar complying with Section FOOTINGS SUPPORTWG WALLS 1805.4.2 AL1S OF LIGHT -FRAME CONSTRUCTIONa.b.c.d NUMBER OF FLOORS WIDTH OF THICKNESS OF - SUPPORTED BY THE FOOTINGS• FOOT es) ess) ) FOOTING (inches) 6 6 3 IIIIIIIIIIBII IIIIIIIIIIIIIIIIIIIIIIIIIIII For S I . 1 inch = 25.4 mm, I foot - 304.8 rnm. a Depth of footings shall be in accordance b The ground under the B permitted t floor is with Section 1805.2. c. to be excavated to the elevation of the top of the footing m g w ale apdbn to b all�be� ed by isolated f footings spaced not more th 6 w on center. entin8 width and length shall be twice d. For thickness of foundation walls, ace Section 1805.5. e Footings are permitted to support a roof in Shall be as upporting one floor addition to the stipulated number of Boors, Footings supporting root o a r rcquircd for s f Plain concrete footings for Group R - occupancies are permitted to be 6 inches thick