In no case shall the foundation wall thickness be less than that of the wall supported. Following are the minimum requirements for foundation walls:
(a) For slab-type dwellings, the foundation walls shall be of poured concrete or masonry eight inches in thickness and extending at least thirty-six inches to the bottom of such walls below finished grade.
(b) For one-story wood frame or masonry structures without basements, the foundation walls shall be of poured concrete footers thirty-six inches to the bottom of such walls below finished grade.
(c) For one and two-story wood frame structures, or one-story masonry structures with basements, the foundation walls shall be of poured concrete, solid masonry units or hollow masonry eight inches in thickness and resting upon a poured concrete footing thirty-six inches to the bottom of such walls below finished grade.
(d) For unattached garages or accessory buildings of frame construction not attached to a dwelling, foundations shall extend not less than twenty-four inches to the bottom of such foundation footing from finished grade or shall be floating slab construction.
(e) For two-story masonry dwellings with basements, the foundation walls shall be poured concrete eight inches thick, hollow masonry or solid masonry units eight inches in thickness and resting upon a footer at least thirty-six inches to the bottom of such wall below finished grade.
(f) Foundation walls of solid or hollow masonry units shall be not less than eight inches in nominal thickness, provided the walls do not extend more than five feet below the adjacent finished grade level when lateral pressure is on one side of the wall only. This depth may be increased to a maximum of seven feet when, in the opinion of the Superintendent of Building and Zoning Inspection, soil conditions warrant such increase.
(g) When two or more units are used to make up the required wall thickness, the inner and outer courses shall be bonded, either with at least one full header course in each seven courses of brick, or with at least one full-length header in each one and one-half square feet of wall surface. The distance between adjacent full-length headers shall not exceed twenty inches, either vertically or horizontally. In solid brick walls of more than eight inches nominal thickness, the inner joints of header courses shall be covered with another header course, which shall break joints with the course below.
(h) Full head joints and bed joints shall be required.
(i) Stepped adjacent separate footings and stepped continuous footings for foundations supported on gravel, sand or clay, or any combination of these, are to be supported by a vertical wall equal in size to the foundation properly formed.
(Ord. 42-1981. Passed 2-23-81.)