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• <br /> • <br /> SOILS AND FOUNDAA11ONS <br /> Gradient, load intuuity and erosion characteristics of elope 1 805.42.3 plain concrete f <br /> Mstcrial. The edge thic.knrss <br /> Of plain concrete footings supporting walls of other than <br /> 1805 . 4 Footirtgs shall be designed an constructed in Light - flame construction shall not be less that 8 inches <br /> Allowable bearing capacity attic soil is not exceeded, (203 mm) where placed on soil. <br /> Thai di needed, and Exception: For plain concrete footings su <br /> differential settlement is minimized. The minimum pponing <br /> Width of footings shall be 12 inches (305 mm) Group R -3 occupancies. the edge thickness is permit- <br /> led to be 6 inches (152 mm),provided that the footing <br /> Does not extend beyond a distance greater that the <br /> Footings in areas with Thicknc of the footing 01 either side of the supported expansive soils shall be designed Wall <br /> In accordance with the provisions of Sestina 1805.8. <br /> 1805.4.2.4 Placement of concrete. Concrete footings <br /> 1 805.4.11.1 Design loads, F shall Shall not be placed through wtvi unless a trtmie or other <br /> cgs ¢e d for method approved by the building ;tficial is 'Ica( Whcrc <br /> the moat tmfavorabk effects due to the combinations of CO <br /> loads specified in Section 1605.3. The dead load shall in- h aCOd under it is the presence of water„ to the a mimi <br /> clued the weight of foundatius„ footings and overlying shall be deposited by approved means to ensure mw. <br /> fill. Reduced live loads, as specified In Section 1607.9. mute segregati o tune mix and negligible turbulence of <br /> Are permitted to be used in designing footings. the water. <br /> 1805 4.1.2 Vibratory loads. Where machinery opera- <br /> bons or other vibrations are transmitted through the 1805.4.2.5 Protection of concrete. Concrete footings <br /> foundation, consideration shall be given in the footing s be protected from freezing during depositing and for <br /> design to prevent detrimental distur nccs of the soil. period of not less than flue days thereafter, osits Water shall <br /> Not be allowed to flow through the deposited concrete <br /> 1 805.4.2 Concrete footings, The design, 1 05tion cut materials and con- 1805.4.2.6 Forming of concrete. <br /> Cret footings shall comply with Sections fir' footings are <br /> 1 805.42.1 through 1805.4.2.6 and the c provisions of Ch permitted to be east against the earth whue, in the opin- <br /> us 1803.4.2. ion of the building official, soil conditions do not require <br /> forming, When forming b required, h shall bc in accor- <br /> Exception: Where a specific design ance with e 6 of ACI 318. <br /> gn is not provided, con - <br /> Crete footings supporting walls of light -frame construe- 1805.4.3 Masonry-unit <br /> and constru footings. footings ing s materials <br /> tioo art permitted to bc designed in accordance with <br /> Table l 805.4.2 coon of masonry-unit footings shall comply <br /> with Sections 1805.4.3.1 and 1803432, and the provisions <br /> 1805.4 2.1 Of Chapter 21. <br /> Shall have a Concrete strength. Coocrctc in footings <br /> Sots than 2,500 specified compressive strength (f c ) of not <br /> At 28 days. pounds per square inch (psi)(17 2.37 kPa) so ry -unit Where a specific o r ti design is design <br /> walls of light - not provided, on- <br /> NY - unit footings suppotiflame con <br /> Struction arc permitted to b designed in accordance with <br /> 1 805.4.2 .2 Reserved. Table 1805.4 <br /> 1805.4.3.1 Dimensions, Masonry-unit footing shall be <br /> laid in Type M or S mortar complying with Section <br /> FOOTINGS SUPPORTING WALLS OF LIGHT - <br /> FRAME CONSTRUCTiONa.b.c.d <br /> NUMBER OF FLOORS 1 OF THICKNESS OF <br /> FOOT INGS FOOTING <br /> SUPPORTED BY THE FOOTINGS' FOOT <br /> (inches) <br /> (inches) <br /> 6 <br /> 6 <br /> 3 <br /> 8 <br /> For S1' 1 inch = 25.4 tom, 1 foot - 304.8 norm. <br /> a Depth of footings shall be in accordance <br /> b The ground under the Boor is with Section 1805.2. <br /> b permitted t g by o be excavated to the elevation of the <br /> -stud bearing wall are permitted to be top f t the g w idg <br /> the width shown in this table, and footings isolated footings. The the <br /> and length shall be twice <br /> d. For thidmas of foundation walls, sot Section 1805.5. not more than 6 Fat on cter. r. <br /> c Footings are permitted to support a roof to addition to the stipulated number of floors, Footings supporting roof ooh <br /> Shall be as supporting one floor. <br /> f Plain concrete footings fa Grasp R -3 occupancies arc permitted to be 6 inches thick <br />