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SOILS AND FOUNDAA11ONS Gradient, load intensity and erosion cLaracttristies of slope 180 5.423 Plain concrete f Material oo n . edge thickness Of plain concrete footings supporting walls of other than 1 805.4 Footings shall be designed an constructed in Light-frame construction shall not be less that 8 inches Allowable bearing capacity of the soil is not ex (203 mm) where placed on soil. That differential exceeded, and Exception: For fferential settlement is minimized. The minimum plain concrete footings supposing Width of footings shall be 12 inches (305 mm) � R' ooancies, the edge thickness is i tcd to be 6 inches (152 mm),provided that the footing Does not extend beyood a distance greater that the Footings in areas with expansive soils shall be designed Th" " of the footing ,n either side of the supported Wall. In accordance with the provisions Section 1 805.8. ner 1 805,4.2.4 Placement of concrete. Coocretc footings 1 805.4. /1.1 Deli loads F Shall not be placed through wa:P.r unless a tremie or other g° , °0�gs shall of for method approved by the building ?fftcial is used, Whcrc the most umfavorobk effects due to the combinations loads specified in Section 1605.3, The dead load shall shall be deposited in- placed undo or in the presence of water„ the clads s he weight of foundations„ 1 05. footings and load shall in- cocci-me by approved means to le C urb l e n t Arc Reduced live loads, n specified in Section 1607.9, mum he segregation of the mix and negligible turbulence 01 Pc niued to be used in designing footings. 1805. 4.12 ° Vibratory loads. Where machinery opera- 1805 4. other vibrations are 1805.4.2.5 Protection of concrete. Concrete footings transmitted through the shall be protected from freezing foundation, consideration shall be given in the footing a during depositing as for design to prevent detrimental dices of the sod. period of not less than five days thereafter. Water shall Not be allowed to flow through the deposited concrete. 1 805.4.2 Concrete footings, The design, materiels end con- struction of concrete footings shall Dom 1805.4.2.6 Forming of concrete. Concrete footings are tructi .2.1 ply with Sections permitted to be east against the earth through 1805.41.6 and the provisions of Chap- ion oldie building fie. in the require to c 805.4.2. ding official soil conditions do not require forming. Where forming b required, h shall be In acoor- Exception: Where a specific design is not provided, corn- darted with QtaWa 6 of ACl 318. Crete footings supporting walls of light -frame construe- d in accordance with 1805.4.3 Masonry-unit footings. footings design, materials Lion arc permitted to be designe Table 1805.4 2 and construction of masonry -unit footings shall comply with Sections 1805.4.3.1 and 1805.4,3,2, and the provisions 1 805.4..2.1 Of Chapter 21. 180 have a specified compressive Coocrete in footings Seas than a sp pow � ive strength (f` c ) of not Per square inch (psi)(17 237 kPa) so Exception: footings s spe design wal u not ht -f r a ed, on - ma- At 28 days, my -unit ds 8s supporting g walls of light - frame con Struction arc permitted to b designed in accordance with 1805.412 Rcscrvcd, Table 1805,42. 1805,43.1 Dimensions, Masomy -unit footing shall be laid in Type M or S mortar complying with Section • TABLE 1805.4.2 • FOOTINGS SUPPORTING W ALLS OF LIGHT -FRAME CONSTRUCTIONab.c.d NUMBER OF FLOORS OOTI OF THICKNESS OF SUPPORTED BY THE FOOTINGS' F007� (inches) FOOTING ) (inches) .........nmn....________ . 6 IIMIIIIIIIIIIIIIIIIUIIIIII 6 3 For S 1 • I inch = 8 25.4 trim, I foot a 304.8 mm. a Depth of footings shall be in accord b The ground permitted t d u nder t he Boor is with Section 18052. c to be excavated to the elevation of the top of the footing m des table, endue to be supported by isolated footings. 8s shal) be spaced not more th footing width and length shall be rwicC d. For thickness of foundation walls, see Section 1805,5. c Footings arc permitted to upportin,g floor on to the stipulated number of floors, Footings supporting roof orU) Shall be as requioxl for f Plain concrete footings for Group R -3 occupancies are perminrri if, ►,. c .i.:..o