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The grade away from foundation walls shall fall a minimum of 6 in. within the first 10 ft., except as restricted by lot lines where the fall will be a minimum of 6 in. regardless of the horizontal distance available. R-301.3 Basement walls, foundation walis, porches, carport slabs and steps exposed to the weather, and garage floor slabs shall have a minimum specified compressive strength of 3000. Table NO. R-302.2 Footings sections: 12 in wide - 1 story; 15 in.- 2 story, 18 in. 3 story. Footings shall extend not less than 18 in. below the finish natural grade. R-303 4. Foundation walls shall extend at least 8 in. above the finished grade to the founda- tion at all points. R-304.2 Masonry and concrete foundation walls shall be constructed using the following criteria: D~-~ains shall be provided around all concrete or masonry founda- tions. Perforated pipe or other approved systems or materials shall be ~-nstatled at or below the area to be protected and shall discharge by gravity or mechanical means into an approved drainage system. 305.1 Exterior foundation walls of masonry construction enclosing basements shall be dampproofed. Foundation walls of habitable rooms located below grade shall be waterproofed. R-306.1 11. 13. Bathrooms shall be provided with artificial light and an approved mechanical ventila- tion system capable of producing a change of air every 12 minutes or a window of not less than 3 sq. ft., one-half of which must be operable. R-203.3 Every sleeping room shall have an exterior door or not less than 5.7 sq. ft. of openable window. The min. net clear opening height shall be 24 inches. The min. net clear opening width shall be 20 inches. The finished sill height shall be not more then 44 inches. R-210.2 17. Ail habitable rooms shall be provided with aggregate glazing area of not less than 8 percent of the floor area of such rooms. One-half of the required area of glazing shall be openable. Where bottom of glass light is within 18 in. of floor and all glass doors and wall panels of bathtub and shower enclosures, must be of laminated, tempered or wire glass. R-208.4 Openings between the garage and residence shall be equipped with solid wood doors not less than 1 3/8 in. in thickness or equivalent R- 209.1 The garage shall be completely separated from the residence and its attic area by means of 1/2 in. gypsum board or equivalent applied to the garage side. R-209.2 The minimum net area of venti- lation openings shall be not less than 1 sq. ft. for each 150 sq. ft. of crawl space area. Openings shall be within 3 ft. of each corner of said building. An access crawl hole 18 in. by 24 in. shall be provided to the underfloor space. R-309.2 Not less than one exit shall be provided from each dwelling unit. The required exit door shall be a side-hinged door and not less than 3 ft in width and 6 ft 8 in. in ht. R- 211 The under floor shall be grade cleaned of all vegetation and organic materials. R-309.3 Stairways shall not be less than 3 ft in clear width, and the headroom shall be 6 ft 8 in min., rise 8 1/4 max., and run of 9 in. min. R-213.1 Handrails having min. and max. heights of 30 in. and 34 in. respectively, measured- vertically from the nosing of the treads, shall be provided on at least one side of stairways of three or more rises and shall be continuous the full length of the stairs and shall extend 6 inches beyond the top and bottom rises. Ends shall be returned or shall terminate in newel post or safety terminals. R- 214.1