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Gnutieot, load intensity and eros.iOD c.hanl.cteristics of ~ope MBterial . l80S .4 Footings shall be designed an constructed in Allowable bearing capacity of tile soil is not exceeded, and 11uIt differentiaJ settlement is minimized. The minimum Width offootinga shall be 12 inches (305 mm) Footings in areas with expansive soils shall be designed In 8CCOrdance with the provisions of Section 1805.8. ] 805.4./1.1 Design loads, Footings shalJ tx: designed for the mo&t unfavorable cffocta due to the combinations of loads specified in Sectjoo 1605.3. The dead load shall in. clued the weight of foundatioos" footings and overlying fiil. Reduced Uve loads, lIS speclned In Section 1607.9. Are permitted to be used in designina footings. 1805.4.12 Vibratory loads. Where machinery opera. tions or other vibrations arc transmitted through the foundation, consideration shaJ/ be iNen in the footing design to prevent detrimc:otaJ disturbances of the soil. I &05.4 2 Concrete footing&, The design, materiaIa and COD- structjoo of coocrete footings shall comply with Sections 1805.42.1 through 1805.4.2.6 and the provisions 0(0lap- tcr 1805.42. Exception: Where a specific design is no( provided, coo- Crete footings supporting walls o(light-frame construc- tion are permined to be designed in accordance with Table 1&05.42 1805.4 2.1 Coocrete strength. Coocrete in footings Shall have 8 specified compresaive Itrengtb (f'c) ofoot Less than 2,500 pounds per square inch (PSi)(l7 237 kPa) At 28 days. 1805.422 Reserved. SOILS AND FOUNDAA nONS 1805.4.2.3 Plain concrete~. The edge thickness Of plain coocrete footings IUppOrting walls of other than Light-frame construct.ioo ahaJ.I DOt be less that 8 inches (203 mm) where placed on soil. Exception: For plain concrete footings supporting Group R-3 OCCUpancies. the edie thickness is permit- ted to be 6 inches (152 mm),provided that the footing Does DOt extend beyond a distance greater that the Thiclc:neM of the footin~ OIl e1thcr side of the suppooed Wall. 1805.4.2.4 Placement of coocrete. Concrct.e footings ShalJ not be placed through water unless a trcmie or other method approved by the building official is used, Where placed under or in the ~ of water" the coocret.e shall be deposited by approved means to ensure mini- mum segregation of the mix and negligible turbulence of the water. 1805.4.2.5 Protection of concrete. Concrete footings shall be protected from freczinB durin8 depositing and fen a period of not less than five days thereafter. Water shall Not be allowed to flow through the deposited coocrete. 1&05.4.2.6 Forming of concrete. Concrete footings an: permitted to be east against the earth where, in the opine ion of the building official. soil conditions do DOt require furming. Where forming Is requlred, it shal.I be In acoor- dance with Chapter 6 of ACl318. 1805.4.3 Masonry-unit footings. The design, materials and construction of masonry-unit footings shall comply with Sectiow 1805.4.3.1 and 1805.4.3.2. and the provisions Of Chapter 21. Exceptioo: Where 8 specific design is DO( provided, ma- sonry-unit footings supporting walls of light-frame con. Struction are permitted to b designed in accordance with Table 1~.4.2. 1805.4.3.1 DimaWoos, Masomy-unit footing aba1J be laid in Type M or S mortar complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WAllS OF LIGHT-FRAME CONSTRUcnONab.c.d WIDTH OF I nnCKNESS OF NUMBER OF FLOORS FOOTINGS FOOTING SUPPORTED BY lHE FOOTINGS. (inches) (inches) 1 12 6 2 15 6 3 18 8 For S I: I inch = 25.4 mm, I foot., 304.8 rom. a. Depth offootings shall be in accordance with Section 1805.2. b. The ground UDder the floor is permitted to be excavated to the elevation of the top of the footing. c. Intcrior~ walla are pc:rmiUed to be IUpportcd by isolated footings. The footing width 8Dd length &ball be twice the width shown in this table, and footings shall be spaced not more than 6 Feet on center. d. For thickness offoundatiOf) walls, see Section 1805.5. e. Footings are permitted to support . roof in addition to the stipulated nwnber of tJoors, Footings supporting roof only ShalJ be as required for supporting ODe floor. ( Plain coocrete f~ for Grouo R-3 OCCUDancil";llll~ nt"rmif1Ni t" "" {:. ;.,,.h.... H,;,.I,