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Gnuiient, load intensity and eI"O$.ian ~cs of oJope M1neriaL 1805 .4 Footings shall be designed an constructed in Allowable bearing capacity of the soil is not exceeded, and Jlu$ differentiaJ settlement i3 minimized. The minimum Width of footings shall be 12 inches (305 mm) Footings in areas with expansive soils shall be designed In accordance with the provisions of Section 1 SOs.g. J 805.4.11.1 Design loads, Footings shall t>e designed for the ~ unfavorable efIoct.B due to the combinations of loads specified in Sectioo 1605.3. The dead load shaJJ in- clued the weight of foundations.. footings and overlying filJ. R.educcx1 Uve loads. lIS speclfted In Section 1607.9. Are permitted to be u.sed in designina foodngs. 1805.4.12 Vibratory loads. Where machinery opera- tions or other vibratioru are b"1lnsmitted through the foundatioo, consideration shall be iiven in the footing design to prevent dctrimcntaJ disturbances of the soil. 1 &05.42 Concrete footing&, The deaign, materials and c0n- struction of coocrete footings shall COO1pJy with Sections 1&05.4.2.11hrough 1805.4.2.6 and the provisions ofOlap- tef J~.42. Exception; Wbcrc a specific design is no( provided, coo- Crete footings supporting walls of light-frame coostruc. lion are ~ to be designed in accordance with Table 1805.4.2 I 805.4.2. I Coocretc strength. Concrete in footings Shall have a specified compresaive Jtrength (fc) afoot Less than 2,500 pounds per square inch (PSi)(J 7237 kP8) At 28 days. 1805.422 Reserved. SOILS AND FOVNDAA 110NS 1805.4.2.3 PWn roncrete~. The edge thickness Of plain ~ footings supporting wulli of other than Light-frame constructioo s.ha.I.l not be Jes.5 that 8 inches (203 mm) whm placed on soil. Exception: For plain concrete footings supporting Group R-3 OCCUJ,lancies. lhe edie thickness is permit- ted to be 6 inches (152 mm),provided that the fOOling Does not extend beyood a dist3nce greater that the Thic.kneM of the footin~ "n either 3idc of the 3upp<x1ed Wall. J 805.4.2.4 Placement of COI'lac:te. Coocrete footIngs Shall DOt be placed through Wait.!' unless a trcmie or other method approved by tbe building )tliciaJ is used, Where placed under or in the preaence of water" the COGCrele shall be deposited by approved means to ensure mini- mum segregation of the mix and negligible turbuJence of the water. 1805.4.2.5 Protcctioo of concrete. Concrete footings shall be protected from freezing during depositing and fvi a period ofoot less than five d8)'3 thereafter. Water shaJl Not be allowed to flow through the deposited coocretc. I &oS .4.2.6 Forming of COOCI'Cte. Concr-et.e footings an: permitted to be cut against the earth where, in the opin- ion of the building official, soil conditioos do 00( require furmlng. Where tonn1ng Is n::qu1red, it shall be In accor- dance with Olapter 6 of ACl 318. 1805.4.3 Masonry-unit footings. The design, mataiaJs and construction of masonry-unit footing.! shall comply with Secticm 1805.4.3. I Ilrld 1805.4.3.2. and the provjsioll5 Of Chapter 21. Exceptioo: Where 8 spocific design is oot providod, ma- sonry-unit footings supporting walls of light-frame con- Struction are permitted to b designed in IlCCOI'dance with Table 1805.4.2. I 805.4 3. J DimaWoos, Masoory-unit footing &ha1J be laid in Type M or S mortar complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WALLS OF LIGI-IT-FRAME CONSTRUcnONa.b.c.d WIDTH OF I THlClCNESS OF NUMBER OF FLOORS FOOTINGS FOOTING SUPPORTED BY THE FOOTINGS. (inches) (inches) 1 12 6 2 15 6 3 18 8 , For S!' I inch == 25.4 mm, I foo( '" 304.8 mrn. a. Depth of footings s.halJ be in acrordaoce with Sectioo 1805.2. b. The ground under the f100f' is permitted to be excavated to the elevatioo of the top of the footing. c. Interior-stud-bcaring wallJ are perm.it:tcd to be IUppOrted by iIoLated footings. The footins width and length shaII be twice the width shown in this table, and footings shall be spaced not more thM 6 Feet on center. d. For thiclcness offoundatioo walls., see Section J805.5. e. Footings are pennitted to support I roof In additioo to the stipulated nwnber of floors, Footings supporting roof oruy Shall be as required for supporting one floor. ( Plain coocrete footings for Group R-3 oo::upancies are permitted to be 6 inches thid.