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SOILS AND FOUNDAATIONS Gradient, load intensity and erosion c err atri es of Elope 18 05.42.3 Plai concrete footings. Mc edge Material Of ply concrete footings supporting walls of other than 1805 . 4 Footings quill be designed an constructed in Light-frame construction shall not be less 1805.4F Footings (203 mm that 8 inches bearing capacity ty of the soil is not exceeded, and ) la. placed on soil. T hat diffc*�vtin1 settlement is minimized. The minimum Exemption: For plain concrete footings Width of footings shall be 12 inches (305 mm) Grou R-3 occupancies. the edge permit- led to bc 6 inch (152 mm footing ).Provided that the Cooing Does not extend beyond a distance greater that the F ootings to areas with expansive soils shall be designed al e" of the footing ,..11 tither side of supported Wall. In accordance with the provisions of Section 1 805.8. 1805,4.2.4 Placement of concrete. Concrete footings 1805.4./ 1.1 Design loads, Footings shall bc tics' Shall not be placed through ww i unless a uremia or other the most unfavorobk effects due to the combinations of for method approved by the building ifficlsl is turd, Whcrc loads Specified m Section 1605.3. The dud load shall in- Pieced ante( or the presence prov j of write„ the clads the weight of foundations„ footings and overlying shall be deposited concrete by approved mans to le t urd mini fill. Reduced live loads, as specified in Section 1607.9. mum segregation oldie mix and negligible turbulrncY of Arc P used to be ed in designing footings. the water. 1805 4.11 Vibrato I 1 8 0 or other vibrations ere . 4 .2.5 Protection of transmitted through the . during depo footings foundation period not less titan five days there consideration shall be given in the footing shall be protected from a freezing a after. ling and for a design to prevent detrimental disturbances of the soil. after. cr shall Not be allowed to B con ow through the deposited coocrttc . 80 1 542 Concrete footings, The design, materials and con- 1805.4.2.6 Forming of carxrete. I8 uction 1 footings shall comply with Sections permitted to be east Concrete footings are through 1805.4.2.6 and the provisions of Chap- ion of the boil the earth mac' in the opin- tcr 1805.42. ding official, soil conditions do not rtquirc forming. Where forming is required, it shalt be In eccor- Exception: Where a specific design is not provided, can- dared with er 6 of AC] 318. Crete footings supporting walls of light-frame oonsWc- 1805.4.3 Masonry-unit Lion arc permed to be designed in accordance with footings, o ings shall materials Table 1805.4.2 and construction of masaruy -unit footin with Sections 1805,4.3.1 and 1805.4.3 and ecomply p v 5 Of Chapter 21. 180'4 2.1 provisions 180 have 5 a specified n Concrete strength. Concrete in footings S than a pounds compressive rah)( c) of not kPa) per square inch i J 7 237 kPa Exception: Where ° specific design wal u not h rovided, ma At 28 days. sorry -unit footings supporting walls of light-frame con - Struction are permitted to b designed in accordance with 1805,4 21 Reserved. Table 1805,42. 1 805.43.1 Dimensions, Masonry -unit footing shall bc laid in Type M or S mortar complying with Section FOOTINGS SUPPORTING WALLS OF LIGHT -FRAME CONSTRUCTIONab.c.d NUMBER OF FLOORS WIDTH OF THICKNESS OF SUPPORTED BY THE FOOTINGS• FOOTINGS FO (inches) (inches) (inches) _11 _II _11 _InllmIIIIIIIUIIIII 6 6 3 1111111111111111111111- For S I I inch = 8 25.4 mm, 1 fool a 304.8 mm. a Depth of footings shall be m b accordance with Section 1805.2. T e ground tinder the floor is permitted to be excavated to c Interior-atud- bearing walls are permitted to be supported b the elevation of the top of the footing the width shown in this table, and footin Y isolated footings. The footing width and l shall be twin d. For thicimess of foundation walls, see Section 1805 not more than 6 Feet on center. c Footings art permitted to support g ° roof on to the stipuiatcd number of floors, Footings supporting root onh Shall be as required for s f Plain coocrtit footings for Group R -3 occupancies arc permitted to be 6 inches thick