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lee grade away from foundation walls shall [all a re±nisuS of 6 in. within the first 10 ft.~ e~cept as restricted by lot lines where the fall will be s minimum of 6 in. regardless of t n~ her ~ zonta 1 distance ?. Basement walls, foundation wal~s, porches, carport slabs and steps exposed to the weather, and garage floor oleos shall have a minimum specified compresstve strength of 3000. Table No. R-302.2 Footings aec%lens: 12 in. wide 1 story~ 15 in.- 2 story, 18 ~n . 3 story. Footings shall ex%end not less than _~ in. below the finish natural grade. R-3D3 4. Foundation walls shall extend at leas~ 8 ln. above the finished grade to the founda- tion at all points, R-304.2 5. Masonry and concrete foundation walls shall be constructed uslng the following criteria: R-304.3 .... ~) Drains snell be provided arotnld all concrete or masonry founda- tions. Perforated p%pe or other approved systems or materials shall ee installed at or beloe the a~ea %o De protected and shall d~scharge by gravity or m ecnanlcal means into an approved drainage system. 305.1 Exterior fecundation walls of masoery construction enclosing basements shall ~e 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 space area. Openings shall be within 3 ft. of each corner of sa~d building. An access crawl hole 18 in. by 24 in, shall be provided to the underfloor space. R-309.2 10. The under floor grade shall be cleaned of all vegetation and organic materials. R-309.3 11. Bathrooms shall be provided with artifkcial light arid an approved mechanlcal ventila- t zen system capable of producing a change of air every 12 mlsutes or a w~ndo~ of not less than 3 sq. ft., one-half of whlc~ most Dc operaOle. R~203.3 ~) Every sleeping room shall have an exterior door or not less than 5. 7 sq. ft. of openable window. Thc min. net clear opening height snail oe 24 inches. The mln. net clear op~ning width shall be 20 ~nohes . The finished sill height s~all be not more thcs 44 inches. R-210.2 13. All 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. 14. 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 15. Openings between t~c garage and residence shall be equipped with sol~d wood doors not less tna~ 1 3/8 ~n . in tlhlckness or equivalent 209. l 1{5. Thc garage shall nc completelf separated from %he residence and its attic area by means of 1/2 in . gyps~m [%oar d or equivalent applied to the garage side. 8-209.2 17. Not less than one exit shall ~>e provided from each dwelling unit. The required exit door shall be a side-hinged door and not less titan 3 ft In width and 6 ft 8 ~n. Ln t%t. 211 19. Stairways shall not be less than 3 ft ~n clear width, and the headroom shall be 6 ft $ 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 ex%end $ inches beyond the top and bat%om rises. Ends shall be returned or shall terminate in newel post or safety terminals. 214.1