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SOfLS AND FOUNDAA11ONS Material load intensity erasion � end erasion araet�; cs of slope 1805.4 2.3 Plain concrete footings. Of plain concrete footings ' The edge ih'ckness s 180 5.4Footi Li t -frame supporting walls of other than Footings shall bc designed an constructed in g construction shall not bc Tess that 8 inches Allowable bearing capacity of the soil is not ex (203 rnm) where placed on soil. Thai able ea g pact o minimized. The exceeded, and Exception: For plain concrete footings Width of footings shall be 12 inches (305 mm) minims Group R-3 o to ancies, the Pcrm �pponing ted to bc 6 inches (152 mm),provided t n . Rocs not a that the footing Footings ThlcJmesa footing ter sr � d e of LLpponcd &s in eras with expansive soils shall be designed in accordance with the provisions of Section 1805.8. Wall. 1805.4.2.4 Placemait of concrete. Concrete footings 1 805.4./ 1,1 Design loads, F shall Shall not be placed through water unless a tremie or other the most uutavo effects due to combinations a for method approved by the building west dal is co W loads specified in Section 1605.3. Thc dead load shall in - Placed untie or in the clued the weight shall bed a'x'e en s to er„ r 8h oundatians„ footings and overlying e p O81 on by approved means to le ensure C l e n t fill Reduced live bads, u specified hi Section 1607.9. mum segregation of the mix and negligible turbulence ut Arc Pitted to be used in designing footings, the water. 18 1805 4.1 Vibratory Where rato loads. machinery 1 8 4. 2 i i ern e � opera- 1805.4.2.5 Protection of bons or otq other vi ideation shill be m tt en h in th e Footing shall be protected from Concrete depositing design to prevent a period of not less than five positing and for detrimental disturbances of the soil. Not be allowed to flow through the Water shall 1805 4.2 Concrete footings, deposited 000cnccc. ga The design, materials and con - strvction of oantaetc footings shall nom 1805.4.2.6 Forming of concrete. tract ion ply with Sections permitted to be east Concrete footings trnO are ter 1805.4.2. through 1805.42.6 and the provisions of Chap- ion of the boil against t he earth when. in the opin- ding official, soil conditions do no( forming. When tonging is required, h shall be in r c Where a specific design u no( provided, core Crete footings supporting dance with Chapter 6 of ACI 318. Cre walls of light-frame construe- 1805.4.3 M Lion are permitted to be designed in accordanc and construction of e with Masonry-unit footings. The design, materials Table 1805.42 m with Sections 1805.4.3.4 1805.4.3.2. e and the provisions 1805.42.1 Of Chapter 21. 805 . 4 provisioru 1 80ll have a � strength. Concrete in footings Less than a specified ed compressive strength (f c) of not Al 28 des Pounds square inch i 17 237 kPe)' a specific design is not provi Ys. angry-unit footings supporting walls of light-frame con 1805.422 R St action arc permitted to b designed in accordance with eservcd. Table 1803,42. 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 WALLS OF LIGHT -FRAME CONSTR UCTION& b. c. d NUMBER OF FLOORS WIDTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS* (inch )GS FOOTING (inches) (inches) IIIMIIIIIIIIIIIIIIIII IIIIIIIIIMMMIIIIIIMIIIIIIIIIII 6 3 6 For S 1 • 1 inch = 25.4 mm, I foot < 8 a 304.8 min. Depth of footings shall be in accordance with Section 1805.2. b The ground under the Boor is c. permitted to be excavated to the elevation of the top of the footing walls are m i bus table and to be supported by isolated footings. The footing width and I 8s shall be spaced no nor than 6 Feet on center. length chap be rwicx foundation walls, sec Section 1805.5. c Footings are P to support 1 roof to addition to the , d. For thickness off Shall be as required for supporting one floor, snpulatcd number of floors, FOB supporting root onto f. Plain concrete footings for Group R -3 occupancies arc permitted to be 6 inches thick