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10. 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 ~alls, 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. wzde 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 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: R-304.3 Drains snell be provided around all concrete or masonry founda- tions. Perforated pipe or other approved systems or materials shall be installed at or below the area to be protected and shall d~scharge by gravity or mechan ~cal means into an a~proved drainage system. R~ 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 The minimum net area of venti- lation openings shall be not less than 1 sq. ft. for each 150 sq. ft. of crawl apace area. Openings shall be within 3 ft · of each corner of said building. An access crawl hole 18 in. by 24 ~n. shall be provided to the underfloor space. R-309·2 The under floor grade sl~all be cleaned of all vegetation and organic materials. R-309.3 12. 13. 17. Bathrooms shall be provided with artificial light and an approved mechanical ventila- tion system capable of prodzcing a change Of air every 12 minutes or a window of not less than 3 sq. ft.~ one-half of which must Oe operable· R-203.3 Every sleeping room shall nave an exterior door or not less than 5.7 sq. ft. of opcnaQle window. 'Phs m~n. net clear opening height shall De 24 znches. The mzn, net clear openlng width shall se 20 inches. The finished sill height shall De not more them 44 inches. R-210.2 All habitable rooms shall De provided ~.~z th aggregate glazing area of no% 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 l£ght is within 18 in. of floor and all glass doors and wall panels of bathtub a~d shower e~closures, 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 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 garage side. R-209.2 Not less than one exit shall be provided from each dwelling unit. The required exlt door shall be a side-hinged door and not less than 3 ft in width and 6 £t 8 in. in hr. R- 211 Stairways shall not be less than 3 ft in clear width, and the headroom shall be 6 ft 8 in min., rlse 8 1/4 max.~ and run of 9 ~n. 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 provtded on at least one s~de Of stairways of three or moro r~ses and sha] 1 be cent tile £ull lcngtl~ ~>1 tl~' and snail extend 6 inches beyond the top and bottom rises, Snds shall be returned or shall terminate in newel post or safet) terminals, R- 21~.1