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Gradient, I SOILS AND FOUNDAATIONS Material nerd intensity and erosion characteristics of elope 1805.423 Plain concrete Of plain footings. The edge thickness concrete 1 805.4 Footings shell be designed an constructed Light-frame p1airamc construe supporting walls of other than 1805. bcarin cted in shall not bc Ices that 8 inches That differential g ��ty of the soil is not exceeded, and Exception: whew lain concrete soif settlement is minimized. The minimum Group R 3 For plain c ze thickness s is m Width of footings shall be 12 inches (305 mm) tcd to be 6 rt 8 sec (152 mm),provided that the ,the edttC thiclrncs is footing permit tnch (152 footin Footings in areas oot � extend a distance greater that the R ex pans i ve soils shall be designed Wail. b 0n either side of the supp In accordance with the provisions of Section 1805.8. 1805.4.2.4 Placement of concrete. Concrete footings 1 805.4./1.1 Design loads, F shall Shall twt be placed through writer °o �� be designed for a trcmi or other the most unfavorabk effects due to the combinations of method approved by the building , fl5cial t loads moist in Section 1605.3. The dead load placed uncles or in the Where clads the weight of foundations„ 1 shall in- shall bed presence of means to the e mini - clued R��od live " footings and overlying deposited by a mix and t ens loads, 113 used in designing c (fled ht Seaton 1607.9. mean segregation of the mix and nc i blc art mini Are permitted to be footings the 8i turbtrlencc 01 1 80 15. 4.12 Vibratory loads, Where }ti 80 4. other ibrato are machinery opera- 1805.4.2.5 Protection of transmitted through the concrete. g depositing footings foundation, consideration shall bc given in the footing shall be protected from SeGrnB during f osign to n, coIIt disturbances gi i of the son. a period of not Is than five thereafter. depositint r shall for Not be allowed to flow si Water shall 1 805.4.2 Concrete footing,s, through the deposited concrete t tr0 5 42 of concrete o� The design, materials and c footings shall comply with Secti 1805.4. t Forming of I 8 r 18 .4 through 1805.4 2.6 and the provisions of (dap- permitted to be east against concrete. footings c are t ` I . 42.1 • forming. ion of the building require ding o85cia1, soil conditions s do not req Exception: W a � fo�n8 b required h shall be in , - Crete f specific design u not provided corn. Chapter 6 of ACI 318. footings supporting walls of light-frame coosWc- don art per to be designed in accordance with construction 1805.4.3 M Table 1805.4 2 and asonry-ur>jt footings. Rte design, materials of masonry-unit footings shall comply 1805.42.1 Concrete with Sections 1805.4.3.1 and 1 805.4.3.2, and the provisions Shat) have a COOS in footings Of Chapter 21. S than 2 compressive strength (f+c) of not Al 28 der bounds square inch (psi)(J 7 237 kPa) Exception: a specific design is not Provisos ma n' sorry -unit footings supporting walls of light-frame St action arc permitted to b designed c ed in c n con - 1805.41.2 Reserved. Table 1805.42. acordance with 1805.43.1 Dimensions, laid in 'Type M or S m Masonry-unit footing shall bc complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WALLS OF LIGHT - FRAME CONSTRUCTIONa-b.c.d 1 ` UMBER OF FLOORS WIDTH OF SUPPORTED BY THE FOOTINGS. FOOTINGS THICKNESS OF (inches) FOOTING (inches) IIIIIIIIIIIIIIIIMIII 6 3 6 For S 1 ' 1 inch = 25.4 mm, 1 foot 304.8 mm. 8 a b Depth of footings shall be in accordance with Section 1805.2. under the floor is permitted to be excavated to the elevation c. '�'�n8 w'alh are P er mitted t° be of the top of the footing, the worth shown in this table, and footings shall ba by isolated food. The f d. For thickness off spaced not more than 6 Feet one width and length shall be twice c foundation walls, sec Section 1805.5. C Shall Plain for 1 roof an to the stipulated number of Boors, Footings supporting root' onty concrete footings for Group R -3 occupancies are permitted to be 6 inches thick