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1982 EM rION 2905-2907 may require that ,pccial p►rovi ons be nwkle in the foundation deli; n and con- struction to safeguard against damage due to this expansiveness. He may require a special in%csttgatton and report to provide this design and construction c►derta. (e) Adjacent Loads. Where f(x-Aings arc placed at varying elevations the effect of i0jacent loads shall be included in the foundation design. (f) Drainage. Provisions shall be made for the control and drainage of surface water around buildings. Allowable Foundation and Lateral Pressures Sec. 29Oti. The allowable foundation and lateral pressures shall not exceed the value, set forth in 'Table No. 29-B unless data to substantiate the use of higher values are submitted. Table No. 29-B may be used for design of foundations on rock or nonexpansive soil for Types 1. One -hour, 11-N and V bur it ps which do not exceed three stories in height or for structutes which have cont:,Yrit .t,, footings having a load of less than 2(W pounds per lineal foot and isolate:. fc mngs with loads of less than 50,000 pounds. Footings Sec. 2907. (a) Central. i'ootings and foundations, unless otherwise specifi- cally provided. shall be constructed of masonry, c ,ncrete or treated wood in conformance with U.B.0 Standard No. 29-3 and in all cases shall extend below the frost line. Footings of concrete and masonry shall be of solid material Foundations supporting wood shall extend at least 6 inches above the adjacent finish grade. Footings shall have a minimum 0 •pth below finish grade as indicated in Table No. 29-A unless another depth is recommended by a foundation investigation. (b) Bearing Walls. Bearing walls shall be supported on masonry or concrete foundations or piles or other approved foundation system which shall be of sufficient size to support all loads. Where a design is not provided, the minimum foundation requirements for stud bearing walls shall be as set forth in Table No. 29-A. EXCEPTIONS. 1. A one-story wood or metal frame building no( used for human occupancy and not over 400 square feet in floor area may be constructed with walls supported on a wood f-wundation plate when approved by the building official. 2 The support of buildings by posts embedded in earth shall be designed as specified in Section 2907 (f). Wood posts or poles embedded in earth shah be pressure treated with an approved preservative. Steel posts or poles shall be pro- tected as specified in Section 2908 (h). (c) Stepped Foundations, Foundations for all buildings where the surface of the ground slopes more than I foot in 10 feet shall be level or shall be stepped so ,that both top and bottom of such foundation are level. id) Footing Design. Except for special provisions of Section 2909 covering the design of piles, all portions of footings shall be designed in ;:_cmdance with the structural provisions of this code and shall be designed to winimize differen- tial settlement (e) Foundation Pirates or Sills. Foundation plates or sills shall be bolted to the foundation or foundation wall with nix Icss than 'h-inch nominal diameter steel