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SOILS AND FOUNDAAIIONS Material load intensity and erosion characteristics of dope 1805.4 QCryte footings Of plain e 2.3 Plain concrete Mstcrial o footing. The edge thickness 1 805.4Footi Li - frame o ping walls of other than ngs shall be designee an constructed in g t construction shall not bc less that 8 inches Allowable bearing capacity of the soil is not exceeded, end (203 mm) where placid on soil. Thai d ifferential settlement u minimized. The minimum Group R-3 Exception: For plain weave footings su Width of footings shall be 12 inches (305 men) PPoning x the edge thickness that is foe permit- n ted to be 6 inches (152 mm),provided that the footing Does not extend beyond a distance greater that the Footings in areas with expansive soils shall be designed W�'�'css of the footing cu either side of the supported In accordance with thc provisions of Section 1 805.8. 1805.4.2,4 Placement of ooncrete. Coocrrtc footin 1 805.4./1.1 Design loads, Footings shall be des' Shall not be placed through ward unless a tremie or other the mow unfavorable effects due to the combinations of for method approved by the building w ta il is turd, Where loads specified in Section 1605.3. The dead load shall shall be deposited in- placed under °r in the przaeacA of water„ the loads the weight oS 05. footings dead d shall in- concrete approved meatus to le t urd mini Afro Reduced live loads, as specified hi Section 1607.9. mum segregation of the mix and negligible 4rrbulc of permitted to be used in designing footings, the me 1 l 805.4, I 1 Vibratory loads. machinery Where m 80 4, other vibrations are transmitted m opera 1805.4.2.5 Protection of concrete. Concrete footings foundation, consideration shall given through f oot e d shall be protected from freezing during a period of not Tess than five depositing r s for design to prevent detrimental disturbances of the soil. days deposit Water shall N ot be allowed to flow through the deposited 000crttc 1805.42 Concrete footings, The design, materials and coo.. s'ovction of concrete footings shall comply with Sections crmJ .2.6 be cis g nst the e. � fO° Ba are in I 1 805.4.2. 42 .1 through !805.42 ap- .6 and the provisioprovisions of Ch txrnmitted to be east against airmrt the earth whwhere, the to ion of the building official, soil conditions do not eqm forming. Where forming b requtred, h shall be In accor e Exception. Where a specific design is not provided, con- dance with Chapter 6 of ACI 318. Crete Footings supporting alls of li 8 light- frnnme ConStruc- 1805.4.3 M boa arc permits to be designed in accordance with c tion o tumit footings. o ingdesign, shall comply Table 1805.4.2 and construction of masonry -unit footings with Sections 1805.4.3.1 and 1805.4.3.2, and the 5.4 2. I Cooerete Of Chapter 21. 180 provis Shall have 5 a . Concrete in footings Sha than a specified ed compressive h c) of not )( Al 28 days. pounds per square inch (psi )(I 237 kPa) Exception: Where ° specific design u ng walls of light - not provided ma my - unit footings supporting con Strucdon are permitted to b designed in accordance with 1805.4_22 Reserved, Table 1805.42. 1805.4.3.1 Dimensions, Masonry-unit footing shall bc laid in Type M or S mortar complying with Section • FOOTINGS SUPPORTING W TABLE 1805.4.2 WA OF LIGHT -FRAME CONSTRUCTIONa.b.c.d NUMBER OF FLOORS NTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS' FOOTINGS FOOTTNG (inches) (inches) 6 3 6 For S I ' I inch = cam, m, 1 foot a 304.8 corn. 8 a. Depth of footings shall be in b accordance with Section 18052. ground tinder the floor is permitted to be excavated to the elevation of thc top of the footing. c the w ore s table, e � to be supported by isolated footings. &s shall be spaced 6 Feet footing width and leugib chap be r.v of walls, S .5 not more than 6 Ant on antes, d. For thickness f s. Section 1805.5. c Fob are Pitted to a f]oor en to thc stipulated number of floors, Footings supporting roof onto Shall be as required for supporting C Plain concrete footings for Group R-3 occupancies are pcmitied to be 6 inches thick