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SOILS AND FOUNDAAIIONS Gradient, load intensity and erosion characteristics of elope 1 8 05.42.3 Plain Bane f Of plain The cc thickness 180S.4Foo4ngs shall be designed an co Light-&erne construction � � � of other than 8 ow . 4 F bearing constructed in not be less that 8 inches g capacity of the soil is not exceeded, and (203 mm) whoa pained c soil. f That differential settlement is minimized. The minimum Exception: For plain concrete footings su Width of footings shall be 12 inches (305 mm) G , R -3 pps permit- Led to be 6 occtWa the cro thickness is footing inch= (152 mm),provided that the footin Does not extend beyond a distance B Footings to areas with expansive soils shall be designed Walt of 0ic tO O t i"6 ‘..1.1 tither ,i ce support ln accordance with the provisions of Section 1 805.8. 1805.4,2.4 Plaoeuneat of concrete. Coocm1e footings 1 805.4. /1.1 Design loads, Footings be Shall not be placed through wait: unless a tanie or other the most tmfavaabk effects due the c of for method approved by the build' l Where oads s > est is used roe conc Pied i n Section 1605.3. The dead Toad shall in- °r in eye presence of water„ the clued the weight of foundations„ footings and overlying shall be deposited by approved means to ensure min;_ fill. Reduced live loads, a, specified m Section 1607.9. mum uSrrB�on of the mix and negligible turbulence of Are permitted to be used in designing footings, the water. 805 4.12 8 1 Vibratory 1 8 0 or ry Where machinery opera - other vibrations are transmitted through the hall b .2.5 protection of concrete. Concrete footings foundation, consideration shall be given through in the footing shall be Protected from b zing during f u design to prevent detrimental a period of not less than five thereafter. biting and for disturbances of the soil. Not be allowed to flow posi Water shall 1 805.4 Concrete footings, through the deposited ooncrttc gee, The design, materials and con- struction Of concrete footings shall .6 1 805.4.2.6 Forming of cane, Concrete footings are I ructio .1 ply with Sections permitted to be east through 1805.4 2.6 and the provisions of Chap- ion of the building against the earth `fit' in the opin- e« 1 805.42, dLig o$5cial. soil conditions do not fbrming When forming b required, it shall be In r require Exception: What s specific design u not provided, can- dance with Chapt 6 of ACl 318. Crete footings supporting 8 walls of light-frame construe- 1805.4.3 M art Pa to be designed in accordance with asonry -unit footings. The design materials Table 1805. 2 and construction of masonnry -unit footings with Sections 1805.4.3.1 and 1805.4.3, the comply 1805.4 2.1 Concrete e Of Chapter 21. provisions 8ll have a strength. Coocrrte in footings Less a than a specified compressive strength (f c) of not At 28 der pounds Per square inch (psi)(17 237 kPa) 1°O ' Where a specific design u not provided, ma ys� sorry-unit footings supporting walls of light-frame con- I 805.4 22 Struction are permitted to b designed in accordance with Reserved. Table 1805.42. 1805.43,1 Dimensions, laid in �Y�t footing shall be Type M or S mortar complying with Section FOOTINGS SUPPORTING WA TABLE 1805.4.2 ALLS OF LIGHT -FRAME CONSTR UCTIONa. b. c. d NUMBER OF FLOORS WIDTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS• FOOTINGS FOOTING (tnch NG (inches) (inches) m il N I mi ll mmil .. 6 3 6 For S I• I inch = 25.4 mm, I food e 8 304.8 neon. a Depth of footings shall bc in accordance with Section 1805.2. b The ground tender the Boa is c permitted to bc excavated to the elevation of the top of the footing the his table and footings shall 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 Footings art permitted to the number td to support a roof in ' Shall be as required for supporting one Q stipulated number of Baas, Footings supporting roof Mil f Plain concrete footings for Group R -3 occupancies art permitted to be 6 inches thick