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SOILS AND FOUNDAA71ONS l te load intensity and erosion characteristics of elope 18 05.42.3 ]'fain Gradient, Of plain concrete footings footings. The edge thickness a 1805 .4 Footings Li t- Walls of other than rtga shal be designed an constructed in Light-frame fame construction shall pot be less that 8 inches .Allowable bearing capacity of the soil is not exceeded, and (203 mm) where placed on soil. differed settlement is minimized. The minimum Exception: For plain concrete he c footings su Width of footings shall be 12 inches (305 man) Grotty R-3 oaancies, the eciPC thickness rting tcd to be 6 inches (152 tnm noon ).provided that the footing Does not extend b goad a distance greater that the Thick Footings in areas with expansive soils shall be designed all. e" of the footing t„ either side of the supporictil U accordance with the provisions of Section 1805.8. Wall. 1 805.4.2.4 Placement of concrete. Concrete footings 1 805.4./1.1 Deli loads F Shall not be placed through wail, unless a Iremie or other the most unfav Design loads, , due the shall of for method approved by the build , 1�cial is loads s e o the concrete specified in S ect i on 1605.3. The dud load shall in- pla ced under or it in the prime o the coach shall be deposited by approved nigh tole turbulence mini clued the weight of foundations„ footings and overlying fill Reduced live loads, as specified In Section 1607.9. mesh segregation of the mix and negligible turbuJcncx of Are permitted to be used in designing footings, the 12 Vibratory 1805 4. 1 18 4. ry oads. Where machinery off 1805.4.2.5 P other vibrations are transmitted through the section of concrete. during depositing footings fou ndation, coruidcration shall be given h in the footing shall be protected from freezing during depositing and for design to prevent dttrimwtal disturbance of the soil. a period Jo of net less than five days thereafter. W Not be allowed to flow aka shall 1 805.42 Concrete footings, a The dear through the d eposited coacretc 1 05 .4.2 of ncrete concrete footings � materials and COO- 1805.4.2.6 Forming of concrete. I ructio2.1 shall comply with Sections permitted to be eases Coac footings hc are ter 1805.4.2. through 1805.42.6 and the provisions of Chap- ion of the boi the earth where, in the require ding o fficial, soil conditions do not tor forming Where loaning Js required, h shaft Exception Where a dance with 1n ° �Of' Crete f it design u rant provided, Con- Chapter 6 of ACI 318. footings supporting walls of light -frame construe- tion are perm nJ to be deigned in accordance with and co .3 Masonry footings. The deli Table 1805.4 2 and oorutruc>jon of m 8� materials ationry -unit footings shall comply With Sections 1805.4.3.1 and 1805.4.3 2, and the provisions 1805.4 2.1 Of Chapter 21. 80ll have 2 1 a � strength. Concrete in footings Less than a specified compressive strength c) of not /kJ 28 days. pounds pax square inch i J 7 237 kPa) Exception: WbeWhere s specific design u not provided ma sonny -unit -w nit footings supporting walls of light-frame con - Sbuction arc permitted to b designed in accordance with 1805. Reserved. Table 1803,4.2. 1805.43.1 Dimensions, laid in Masonry-unit footing shall be Type M or S mortar complying with Section FOOTINGS SUPPORTING W TABLE 1805.4.2 Ail WALLS OF LIGHT -FRAME CONSTRUCTION&.b.c.d NUMBER OF FLOORS NTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS• FOOTINGS FOOTING (inches) (inches) 6 3 6 For s1- 1 inch = 8 25.4 mm, 1 foot a 304.8 ram. a Depth of footings shall be m b accordance with Section 18052. ground under the floor is permitted to be excavated to c. the elevation of the top of the footing, the widthsS R are ppamhted to be supported by isolated footings. gs shall be spaced not more th r. width and length shall be twice d. For thickness of foundation walls, see Section 1805.5. c Footings art permitted to support a roof t addition to th o , Shall be as required for supporting one fl e stipulated numbs of Boors, Footings supporting roof orth C Plain concrete footings for Group R - occupanci are permitted to be 6 inches thick