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SOILS AND FOUNDAAI1ONS Gradient, load intensit and erosion characteristics of Elope 1805.42. n concrete f 3 Plain Mater ;� Magi. The edge thickness Of plain coocncte footings supporting walls of other than 18 05.4Footi Light -franc construction shall not be less that 8 inches ngs shall be designed an constructed in Allowable bearing capacity of the soil is not exceeded, and (203 mm) Where placid on soil. Thai differential settlement is minimized. The minimum Group R-3 ErocptR -3 cor plain ooctoccupancies. th co the dY O thick thick rncss supporting Width of footings shall be 12 inches (305 mm) permit- Led to be 6 inch (152 mm),provided that the footing Does not extend beyond a distance greater that the Footings in aeons with Thickne of the footing �� either side of tux supported expansive soils shall be designed Wall In accordance with the provisions of Section 1805,8. 1805.4.2.4 Placement of concrete. Concrete footings 1805.4./1.1 Design loads, Footings shall designed Shall not be placed through wtacP,r unless a trcmie or other the most trmfavorabk effect due to the combinations of for pl od ( d approved by the building under or 1° the Prime of w ie is tuscd Whcrc loads specified in Section 1605.3. The dead load shall in- lec ater„ the concrete clued the weight of foundations„ footings and overlying shall � deposited by approved means to ensure mini mum fill_ Reduced live bads, as specified hi Section 1607.9. th segregation of the mix and negligible turbulence of Arc p�ittcd to be used in designing he fining footings. 1805 4.1 Vibratory Toads. Where machinery opera- how her other vibrations are transmitted through the 1805.4.2.5 Protection of concrete. Concrete footings foundation, OT ()t consideration shall be given h the footing shall be protected from freeing cluing depositing and for design to prevent detrimental Jibe given in of the g a period of not less than five days thereafter. Water shall Not be Wowed to flow through the deposited coacrttc. 1 805.4.2 Concrete footings, The design, materials and coo- strtiction of eancrt;te footings shall Cam 1805.4.2.6 Forming of concrete. Concrete footings are 1805.42.1 ply with Sections permitted to be east 805.42.! through 1805.4.2,6 and the provisions of Ch against soil earth and ti ns in not e gin- ter 1843.4.2, Chap- ion of the building official, soil conditions do not n e forming. Where forming Is required, it shall be In acoor- Exception: Where a specific design not dance with Chapter 6 of ACI 318. � provided, can.' Crete footings supporting walls of Tight -frame construe- 1805.4.3 M Lion are permitted to be designed in accordance with Masonry-unit footings. The footings shall Table 1805.4.2 and construction of matanry -unit footings shall ll c co with Sections 1805.4.3.1 and 1805.4,3.2, and the provisions 1805.42.1 Concrete Of Chapter 21. 1 805 have a . Concrete in footings S hal than 2,500 specified impressive strength )( c) of not L s days. pods per square inch i 17 237 kPa) so y jl Where a specific g wails u not h tovided, on - - nry -unit footings supporting walls of light -frame con Struction arc permitted to b designed in accordance with 1805.41 .2 Reserved. Table 1803.42. 1805.4.3.1 Dimensions, Masonry -unit footing shall b laid in Type M or S mortar complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WALLS OF L1GHT- FRAME CONS'1RUC710Na.b.c.d NUMBER OF FLOORS WIDTH OF THICKNESS OF FOOTINGS S • UPPORTED BY THE FOOTINGS' FOOTING ) (inchees) (inches) 6 6 3 8 For S 1 1 inch = 25.4 mm, 1 foot a 304.8 rnm. a Depth of footings shall be in accordance with Section 18052. b The ground tinder the floor is Interior-stud-bearing walls permitted c permitted to be excavated to the elevation of the top of the footing. rb table, permitted to be supported by isolated footings, The footing width and length shall be twice d For thickness of foundation walls, see Section 1805 not mono than 6 Fat on center, c Footing arc permitted to support a roof to addition to the stipulated number of Boors, Footings supporting root onl) Shall be as required for supporting one floor. f Plain concrete footings for Group R -3 occupancies are permitted to be 6 inches thick