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I I i I . r.....AL. load inJeIWty and ermioo ~cs ofdope ~ 1805 4Footings shaJl be designed an constructed in AJlo Ie bearing Cllpacity oflhe soil is nol exCCeded, and That d tfcreotia.I setdcmcnt is minimized. The minimum Widtb ffootings shall be 12 inches (305 mm) , gs in areas wi!h expansive soils shaU be designed dance with the provisions of Section 1805.8, 180 .4.1 J . J Design loads, Footings sbalJ be designed for tbc unfavonble efl'ecta due to the combiwdioas of loads . cd in Section 1605.3. The dead load !haJJ in- clued weight of foundations.. footings Md oVerlying fill. Itve Ioeds, IS specUlcd jq Section 1607.9. Are Co be used in designing footings. I 80S. .1.2 Vibratory loads. Where machinery opera.. tions other vibrations are transmitted throulh the Ii '00, consideration shin be liven in thc footing desi to prevent dcoimental disturbances of the soil. . : Wbcrc a specific design iI not provided, con- C~e Ii . gs supporting waUs offighr.fi'8me CODStruc. tion are . Co be designed in accordance with Table 180 .4.2 1805.4.2.1 Coocretc streIJgtb. Coocretc in f~ SbaJJ bav a spocified COIDpresaive Itn:aJgtb (re) oroot Less than Soo pounds per squarc inch (PSi)(I7 237 !cPa) Af:28 1805.4.2.2 Rc:scrvcd. SOILS AND FOUNDAA nONS J 805.4.2.3 PJain CODCrete footinss. The cd&e thickness Ofplain CODactc footings supporting walls ofothcr than Light-frame construction shaJJ DOt be Jess that 8 inches (203 mm) wbcnl placed on soil. Exception: For plain concrete footings supporting Group R-3 occupancies. the cdec !hickncss is permit- ted Co be 6 inches (152 mm).providcd that tbe fOOling Docs not extend beyond a distance grea1cr thai the Thickness of the footing 011 either side ofthc sllpported Wall. 1805.4.2.4 Placement of concrer.c. Cooaetc footings ShaU DOt be placed Ibrough water unless a trcmie or othCl method IIpproved by the building official is used, Where placed UGder or in the pIaeB(:e of water.. the c.oocrete shall be deposited by approved means to ensure mini- mwn segregation of the mix and negligible turbulence of the water. 1805.4.2.5 Protcctioo ofCODCretc. Coocnte footings shall be ProIt:ded fiom freezing during dcpo&iting and for a period of not less than five days thereafter. Water shall Not be allowed to flow through the deposited coocrelc. liOS.4.2.6 Forming ofcoocrete. Concn:te footinp are perm.ittcd to be cast against the earth where. in !he opin- ion of the building official, soil cooditioos do not require fonnJog. Where formJog Is n:quJrcd, It shaU be lD accor- dance with Claplcr 6 of ACl 318. 1805.4.3 Masonry-unit footings. The design, materials and c:onstructicn of masoruy-unit footiogs shall comply with Scctioos lB05....3.1llDd 1805.4.3.2. and the provisions Of Chaptc,- 21. Exception: Where I spocific design iI DO( provided, ma- soruy-unit footings supporting walls of light-frame c0n- Struction arc permitted to b designed in accordance with Table IBOS.4.2. IBOS.4.3.1 DimcDaioos, Masoory-uoit foodog shall be laid in T)'pC M or S mortar COOlplying with Section TABLE 1805.4.2 FOOllNOS SUPPORTING WALLs OF UGHT-FRAME CONSTRUcnONab.c.d WIDTH OF nnCKNESS OF FOOTINGS FOOTING (inches) (inches) 12 6 IS 6 18 8 = 25.4 mm, 1 foot ... 304.8 mm. offootiugs &haD be in accordaocc with Section 18052. ground UDder the floor is permitted Co be excavated to the clcvatioo of the top of the footing. . ~ W8lIs II'e permitted to be IUpported by iIolated footiuga. The footing width and length dWI be twice th width sbowa ill this table, and foolings shaJl be spaced not more than 6 Feet on center. ]=: thickness offoundatioo walls, see Scdion 1805.5. F arc pcrm.itb:d to support . roof in addition to the stipuJarcd number of floors, Footings Supporting roof only S be as R:quired for supporting ooc floor. P oooacte footings for Group R-3 occupancies arc pcnniUcd to be 6 inche3 thick. ER OF FLOORS SUP RTED BY 1liE FOOTINGS. 2 3 ForSI: a. b. c. d. e. (