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Gradient, load intensity and erOOan chanlcteristics of ~ope MateriaL 1805 A Footings shall be designed an constructed in AJJoWllbJe bearing C8pacity of the soil is not exceeded, and That ditfcrentW settlement is minimized, The minimum Width offootinga shall be ]2 inches (305 mm) Footings in areas with expansive soils shall be designed Ln IlCCOrdance with the provisions of Sectioo 1805.8, 1805.4./].1 Dr.<Jign loads, Footings sbaJ1 Pc designed for the ~ unfavorable effectJ due to the combinations of loads specified in Section 1605.3, The dead load sha1J in. clued the weight offoundati<m" footings and overlying fill. Reduced Uve ioads, ., spccl1icd In Sectloo 1607.9. Are permitted to be used in designina foodngs. 18054.12 Vibnuory loads. Where machinery opera. tions or other vibratiom arc transmitted through the foundation, consideration shall be iiven in the footing design to prevent detrimental distw-baoces of the soil. I &05,42 Concrete footings, The design, matcriala and COD- structioo of calcrete footinp shalJ COOlpJy with Sections 1805.42.1 through 1805.4.2.6 and the provisions of Chap- ter 18Oj.42, Exceptioo: When: a specific design is no( provided, coo- Crete footings supporting walls of light-frame coostruc- lion arc permitted to be designed in accordance with Table 1805.42 I &05.4.2. I Coocretc strength. Coocretc in footings Shall have II spcoifiod COO1presaive Itrength (f'c) ofnot Less than 2,500 pounds per SQuare inch (PSi)(J 7237 kPa) At 28 days, 1 &05 .4.2.2 RC$CfVcd. SOILS AND FOUNDAA 110NS J 805.4.2.3 P1ain roncrete foot:iJlss. The edse tllidnes.<; Of plain coocme footing] supporting walls of other than Light-frame constructioo ahaI.J DO( be 1CS3 that 8 inches (203 mm) where placed 00 soil. Exception: For plain concrete footings SUPPOrting Group R-3 OCCUpancies, /he edi; thickness is permit- ted to be 6 inches (J 52 llun),provided that the footing Does oot extend beyood 8 cUst30ce greater that the Thickncs3 of the footin~ .;;n either side of the supportc(j Wall. 1805.4.2.4 PlacetnefJt of COOClCtc. Concrete footings ShalJ DOt be pl8C~ through W/W'J' unless a tremie or other method approved by the bui1d~ )fficiaJ is used, Where placed under or in the prc&eoce of water" the c.ooc.rete shall be deposited by approved means to ensure miru- mwn segregation of the mix and negligible turbulence of the water, 1805.4.2.5 Protect:ioo of concn:te. CoOCl"e'le footings shall be protected from freezing during depositing and fOf 8 period ofno( less than five days thereafter, Water shall Not be alJowcd to flow through the deposited COOCrete. 1 &OS .4.2.6 Forming of COOCrete. Concrete footings are permitted to be cast againlt the earth wbcn:, in the opin- ion of the bui1din& officia1, soil cood.itioos do DOt require forming. Where forming Is requ1red, it sha11 be 10 accor- dance with 01ap(ct 6 of ACl318, 1805.4.3 MlIS()nry-unit footings. The design, materials and construction of masoory-unit footings shall comply with Sectioos 1805.4.3.1 and 1805.4.3.2. IIDd the provjsions Of Chapter 21, Exceptioo; Where 8 specific design is DOC provided, ma- sonry-unit footings supporting walls of light-frame con- Struction arc permitted to b designed in 8CC<Ydancc with Table I~A.2. 1805.4.3.1 DimaWooa, Masoory-unit footing aba1J be laid in Type M or S mortar complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WAU.S OF LIGHT-FRAME CONSTRUCTIONa.b,c,d WIDTH OF I THJCKNEsS OF NUMBER OF FLOORS FOOTINGS FOOTING SUPPORTED BY TIiE FOOTINGS. (inches) (inches) I 12 6 2 15 6 3 18 8 For S 1: J inch = 25.4 mm. I foot.. 304.8 rom, &. Depth offootinga sha1J be to acc:ord.ance with Sectioo 1805.2. b, The ground under the floor is permitted to be excavated to the elevation of the top of the footing. c, Interior-ctud-bcarins walla arc perm.itted to be IUpported by iaolated footings. The footing width and length Ghall be twice the width shown in this table, and footing! shaH be spaced DOt more than 6 Feci on center. d, FOf' thickness of foundatioo walls, see Section J 805.5. e, Footings arc permitted to supponl roof In additioo to the stipulated nwnber of floors, Footings sllppofting root' onty Shall be as requjrcd for supporting ODe floor, ( Plain coocrete footings fOf' Group R-3 occupancit$ are permitted to be 6 inches thid.