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• SOILS AND FOUNDAAIIONS . wept, load intensity and erosion t.arecteristies of el Of plain concrete footings 1 805.4.2.3 Plain concrete footings. m ' thickness pporting walls of other than 180 S.4Footings shall be designed an constructed in Light-frame fame construction shall not be less that 1 805.4F Footings 8 inches (203 mm bearing capacity of the soil is not exceeded, and mm) �0 Pled c soil. f Thal differential settlement is minimised. The minimum Exception: For plain concrete footings su Width of footings shall be 12 inches (305 mm) Group R -3 occtgrancies, the edge thiclrn Pponing tcd to be 6 inches 152 mm , rov ided css corm i t ( ) P that the footing Does not extend beyond a distance greater that the Footings to areas with expansive soils shall be designed Thickness of the footing Cal either side of the suppo,�� Wall. In accordance with the provisions of Section 1 805.8. 1805.4.2.a Places meat of concrete. Concret footings 1 805.4./ 1.1 Design loads, F shall Shall not be placed through wa:P,r unless a tremie or other the 8 most unfavorable effects due to combined of for method approved by the build' ,fcial is loads s m g HfJ s ere pecified in Section 1605.3, The dead load shall in- placed be ttmder or in t presence of means to ens a mini- clued the weight of fotutdatiens„ footings and overlying shall � deposited by approved means t ensure mini Arc Reduced live loads, d specified In Section 1607.9. mum e segregation of the mix and negligible turbulence 01 permitted to be used in designing footings. 1805 4.1 2 Vibratory loads. _ other vibrations are Isere machinery the 1805.4.2.5 Protection of ncrete footin Lions or through foundation, r f consider shall be given h o hs h tbe shall be protected from freezia during g "� Y`6 ftcr. and I at l design to prevent detrimental di �ccs of the soil. o be to of net less than five days theepos Water shall Not be Wowed to flow through the deposited cancreu, 1805.41 Concrete footings., The design, materials and coo- struction of concrete footings shall comply with Sections ermitt Forming g ns t the a th who c f in the are 1 805.4.2.1 through 1805.4.2.6 and the provisions of Ch Pitted W be east against the earth where. in the opin- tcr 1805.42 ape ion of the building official, soil conditions do not forming. Where form8 h shall in coin b require acc irc dance with or- Exception: Where a specific design is not provided, con- a 6 of ACI 318. Crete footings supporting walls of light -frame construe- uon are permitted to be designed in accordance with 1805.4.3 ru ction o tutu footings. The design, 11 comply Table 1805.4.2 and construction of masonry unit footings shall comply with Sections 1805.4.3.1 and 1805.4.31, and the provisions 1805.4 2. I Of Chapter 21. 180 have a specified oete . Concrete in footings Se than a counttcompressive strength (f c) of not Per square inch (psi)(17 237 kPa) so y - arm: Where s specific o r d ng design w a l s of light -6a u not provided, on - Al 28 days. munit footings supporting walls con St salon are permitted to b designed in accordance with 1805.412 Reserved. Table 1803.41. 1805.4.3.1 Dimensions, Masonry- unit footing shall be laid in Type M or S mores complying with Section FOOTINGS SUPPORTING W TABLE 1805.FOOTINGS AL S OF LIGHT -FRAME CONSTRUC71ONa.b.c.d NUMBER OF FLOORS W IDTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS• (inchFOOTINGS FOOTING es) (inches) 6 6 3 For S I 1 inch = 8 25,4 mm, 1 foot 304.8 mm. a. Depth of footings shall be in accordance b The ground under the floor is permitted t with Section 18052. c o be excavated to the elevation of the top of the footing the tifw table, and to be supported by isolated footings. The footing width and length shall be twice d. For thickness of foundation walls, see Section 1805 5 not more than 6 Fat on center. c Fob are permitt to a roof In , , Shall be as required fors porting one floor. what to tfic stipulated number of floors, Footings supporting root' onh ( Plain concrete footings for Group R -3 occupancies are permitted to be 6 inches thick