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SOILS AND FOUNDAATIONS Gradient, land intensity and erosion characteristi of dope 1 805.42.3 Main concrete h�crial Of plain concrete footings. The cage thickness • Zings supporting walls of other than 1805 . 4 Foodrtgs shalt be designed an constructed in Light -friune construction shall no be less 1 805.4F Footings (203 mm that 8 inches B capacity of the soil is not exceeded, and ) � planed c soil. f That differential settlement is minimized. The minimum Exception: For plain concrete footings Width of footings shall be 12 inches (305 mm) Crro R-3 occupancies. the mPPoning ar thichtcss is led to be 6 inches (152 true , rovstied permit- Does not extend ( ) t that the footing Footings b yood a distance greatct. that the gs in arras with expansive soils shall bc designed Thick»c , of the footing ,,n either side of the suppo- c In accordance with the provisions of Section 1805,8. WaJI. 1805.4.2.4 Placement of concrete. Concrete footings 1 805.4.11.1 Design loads, Footings shall be des' Shall no be placed through waur unless a trtmie Of other the most tmfavorrbk effects due to the combinations of for method approved by presence building w ai u , is d Whcrc loads specified in Section !605.3. Thc dud load shall in- shall be deposited Placed 1under °f tO thti of wat the clads the weight of foundations„ footings O mini eta gs and overlying by approved t ncans t i le turbulence mini- Reduced Uvc loads, as spoeifled in Section 1607.9. mum segregation of the mix and negligible turbttldnce ,�f Are permitted to be used in designing footings, the water. 11 80 15 4. Vibratory ty oad9. Where rato l machinery _ 180 4. other brato the m o � 1805.4.2.5 Protection of concrete. Concrete footings transmitted through the foundation, consideration shall be given in the footing shall be protected from freezing during design to prevent de a iman� period of not less than five thereafter. depositing and lot disturbances of the soil. Not be allowed to flow sit Water shall 1805.4.2 through the deposited ooncrttc Concrete footings, The design, material and con- struction of concrete footings shall cam 1805.4.2.6 Forming of emcee ; . fungi are I ructio2.1 ply with Sections permitted to be east through 1805.4.2.6 and the provisions of Chap ion of the bail against the earl L' the opin- �' 1805.4. ding official, soil conditions do sot require forming. Where forming is required, It shall be In actor. Exception: Where a specific design u not provided, tarn - dance with a 6 of ACI 318. Crete footings supporting walls of light -frame caos'truc. UOO permitted to be designed in accordance with sad oo 1805.4.3 Masonry-tint footings. The design, Table 1805.4.2 construction of m materials empty with Sections 1805.4.3.d 805 the provisions 1805.4 2.1 Of Chapter 21. prvvisioru 1 80ll have a wed strength. Coccrctc in footings compressive strength (f c) of not L es2s8 2,500 pounds per square inch (psi)(17 237 kPa) onjy i t Where a specific design is not pt f aye da Ys� soruy -unit footings supporting walls of light-frame con - Structioan are permitted to b designed in accordance with 1805 4.12 Reserved. Table 1805.42. 1805.43.1 Dimensions, Ma+m►y -unit footing shall be laid in Type M or S mortar complying with Section FOOTINGS SUPPORTING W TABLE 1805.4.2 ALLS OF LIGHT -FRAIL CONSTRUCTIONab.c.d NUMBER OF FLOORS FOOTINGS • FOOTTNG SUPPORTED BY THE FOOTINGS* (inches) (inches) 6 3 IIIIIIIIIIIIIIIII 6 For S1 1 inch --- 8 25.4 mm, I hoot a 304.8 ruler. a Depth of footings shall be in accordance � ground tinder the Boor is �� Section 1805.2. b c p ermitted t o bc excavated to the elevation of the 1° -1 ring walls are permitted to be supported by top of the footing the width shown in this table, and footings shall be Y isolated footings. 6 P ' on center. d. For thickness dth and length chaff be twice of foundation wall sec S a 5, c not more than 6 Acct on center. s, Section 1805.5. Footings arc permitted to support a roof to addition to the stipulated number of Boors, Footings supporting roof only Shall bc as required for supporting one floor. I Plain concrete footings for Group R -3 occupancies arc permitted to be 6 inches thick