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• SOILS AND FOUNDAA1lONS Ma a of elope 1 805.4.2.3 Plain concrete footings. G laed intercity end eras;an charaei Of plain concrete foe The `` thickness 1 8 0S.4 Footi Li t- supporting walls of other than Footings shall be designed an constructed in Light-frame frame construction shall not be Tess that 8 inches Allowable bearing capacity of the soil is not exceeded, and (203 mm) where placed on soilexceeded, That dim settlement is minimized. The minimum Exception: For plain concrete footings sv Ex P , Width of footings shall be 12 inches (305 mm) Cretin R -3 occupancies. the cdYC thickness ring tcd to be 6 inches (152 mm , rovided permit- Does not extent! ( a di P that the footing Footings beyond distance greater that the gs in areas with expansive soils shall be designed Ti�neas of the footing on either side of the supported U' accordance with the provisions of Section 1805.8. Wall. 1 805.4.2.. Placement of concrete. Concrete Footings 1 805.4./1.1 Design loads, F shall Shall not be placed through wawa unless a trcrnie or other 1 moat unfavorable effects ,Fo the comb of f or method approved by the build' , i�cial is used loads s rote specified i n Section 1605.3. The dead load shall in- placed be LL° °f 1° the presence a ns to the a mwj• clued the weight of foundations„ footings shall be deposited gs and overlying by approved means to ensure mini Reduced live loads, n spocitied in Section 1607.9. mum u8>tt on of the mix and negligible turbulence of Are permitted to be used in designing footings. the 1805 4.12 Vibrato loads. oads. When machinery opera - the 1805.4.2.5 Protection of concrete. Concrete footings rot consideration /hall be given in the footing shall be protected from freezing during depositing and bons or other vibrations are transmitted through for disturbanc of the sod. Period of not less than five days thereafter. Water shall design to prevent detrimental disturbanc Na be allowed to flow through the deposited concrete. 1805.4.2 Cone footings, The design, materials and con- struction of concrete footings shall c mtply with Sections ! 805.42.6 Forming g in the e. Concrete footings th are 1805.45.4 through 1805.4.2.6 and the provisions of Cb Permitted to be east against the earth when. in t 18 5.42 .2. ap- ion of the equ' ter building official, soil conditions do not require forming Where forming is required, h shall be in accor- Exception: Where a specific design if not provided, con- dance with er 6 of ACI 318. Crete footings supporting walls of light -frame construe- don arc permitted to be deigned in accordance with 1805.4.3 Masonry-unit footings. The design Table 1805.4.2 and construction of m materials with Sections 3.1 805. footings the i 1805'4 22•! Concrete Of Chapter 21 provisions Shall have .1 a strength. Concrete in footings Less ha thav a specified strength c) of not Pounds per square inch (psi)( 237 kPa) Exception: Where a specific design u not light-frame - At 28 days. sonry -unit -unit footings supporting walls of light -franc a con- struction arc permitted to b designed in accordance with 1805.4_22 Reserved. Table 1805.42. 1805.43.1 Dimensions, Masonry-.unit footing shall be laid in 'type M or S mortar complying with Section • FOOTINGS SUPPORTING W TABLE 1805.4.2 ALLS OF LIGHT -FRAME CONSTRUCf1ON&b.c.d NUMBER OF FLOORS NTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS• FOOTINGS FOOTING (inches) (inches) 6 3 6 Fof S 1 ' I inch = 25.4 mm, I fool a 304.8 rnrn. a Depth of footings �'� be in accordance with Section 18052. b The ground under the floor is permitted to be excavated to the clev 1 nie+'KK - stud - bearing walls are permitted to be supported by anon of the top of the footing the width shown in this table, and footings shall be Y isolate not more than 6 a n 6 s. The tinng widen and length shall ha1! be tw; d. For thickness of foundation walls, see Section 1805 Fed on ceenter, c S Footings arc permitted to support at r p g loo addition to the stipulated number of Boas, Footings supporting roof h on f Plain 000aete footings for Group R-3 occupancies are permitted to be 6 inches thick