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SOILS AND FOUNDAA11ONS Csrudhent, load intensity and erosion characteristics of slope 1805.423 Alain concrete f Material Of plain concrete foe • ��- The edge thickness walls of other than 18 S. 4 Footings shall be designed an constructed in (203 mm Light - same construction shall not be Icss 18owa4F bearing 8 inches 0 8 capacity of the soil is not exceeded, and ) planed c soli um Exception: For plain concrete footings suctioning That differential settlement is minimized width of foot' The minim Group R -3 footings shall be 12 inches (305 mm) oxt led to be 6 inch gta the edYe thiclmess is D on ti n es (152 mrn),provided that the footing Docs not extend beyond a distance greater that the Footings to areas with expansive soils shall be designed Thida cJS of the footing ,',21 tither side of the supported In accordance with the provisions of Section 1 805.8. Walt 1805.4.2.4 Placement of concrete. Concrete footings 1 8 05.4./1.1 Deli loads F Shall not be placed through waif,: unless a tremie or other tbe moat 18 5 4 unfavor � s hall lx d ens of for method approved by the building )fficial is used, Where loads specified in Section 1605.3, The dead load shall in- placed ands or in the presence of weer„ the clads she weight of foundations„ 1 ens„ footings and d shall in- shall be deposited concrete by approved means to t urb l e n t Are Reduced live loads, as specified in Section 1607.9. the segregation of the mix and negligible ntrb+ilrncx 01 Pitted to be used in designing footings. 1805,4. 1 Vbrato loads, 180 4. ry Where machinery opera- 1805.4.2.5 Pro other vibrations are transmitted through the Protection freezing ezingte. during depositing footings foundation, or consideration shall be given b in the footing shall be protected from period of not less than five Ong durin8 fou d to prevent detrimental hl depositing an for disturbances of the soil. Not be allowed to flow fe Wad shall 1805.42 Concrete footings, through the deposited oaocnctc. t3s, The design, materials and cm- sbvction of concrete footings shell cam 1805.4.2.6 Forming of corxrott, Conk footings are tructi 2.1 ply with Sections permitted to be east against the earth _ through 1805.4 2.6 and the provisions of Chap. ion of the building official, soil conditions do not oP ter 5.42. 2. forming. Where forming Is require dance with 8 end it shall b in acoor- Exception: Whore a specific design is not provided, car Chapter 6 of ACI 318. Crete footings Supping walls of light - frame eonstruc- don are permitted to be designed in accordance with 1805.4.3 construction Masonry-unit footings. o design, 11 cot pl Table 1805.4.2 and eorstruction of masauy -unit footings shall coonply with Sections 1805.4.3.1 and 1805.4.3,2, and the provisions 1805.4 2. I Of Chapter 21. Sha a specified on ete oncrete in footings hall have compressive strength Less than a compres c) of not Per square inch (psi )(17 237 kPa) so arm: Where a supporting ng design wal s of light -frame con- u not provided, Al 28 days. my -unit footings suporti walls Sbuction are permitted to b designed in accordance with 1805.422 Reserved, Table 1803.42. 1805.4.3.1 Dimensions, Masonry -unit footing shall be laid in Type M or S mortar complying with Section TABLE 1805.4.2 FOOTINGS SUPPORTING WALLS OF LIGHT- FRAME CONSTRUCTIONe.b.c.d NUMBER OF FLOORS WIDTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS+ FOOTINGS (incheess) ) FOOTING (inches) 6 111111111111111111111101111.11111 6 3 For S 1 1 inch = 8 25.4 mm, I foot � 304.8 mm. a. Depth of footings shall be in accordance with b 7bc ®otters under the Boor is Section 1805.2. c permitted to be excavated to the elevation of the top of the footing. the 1 �� t0 � supported by isolated footings. The footing width and I ength >� spaced not more than 6 Fed on center. shall be twice d. For thickness of foundation walls, see Section 1805.5. c Footings are permitted to support a roof to addition to the stipulated number of Boors F Shall be as required for supporting one floor. Footings suing roof oru� f Plain concrete footings for Group R -3 occupancies art permitted to be 6 inches thick