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