Illinois Society of Architects · Chicago · leaf 226
s. (b) The handrails of such stairways maybe of wood. Cc) If stairs are constructed of solidstone or plain concrete, having the tread andriser in one piece, then there shall be notless than sixty square inches of stone or con-crete In the cross section of such combinedtread and riser. fd) If stone… … Slow Burning and Mill Construction Pig-. 50. Pig. 51. Section G29c.Fig. 50. Area of cross section A I? C D E sliiillnot be less tlian GO sq. inches. Sccfion 629d.Fig. 51. If area of cross section (A B C D) isJess than 60 sq. Inches or (K) (thicluiess of plat-form) less than 7 in., then metal…
Architecture · Building · Architects
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