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. <br /> ,- <br /> j . •<<�r�. •tt <br /> �i�� I r�� <br /> I ' <br /> , <br /> )�- .`v � <br /> z,z x � •-,^ ,�-x <br /> ' F^�� ''' i <br /> r�y `tobert Dutterficld & /Issociates AI� `,_____� <br /> y �� May 8, 1990 <br /> K y� Page Thme <br /> '�1 H'+C <br /> H N� 1G. Risers on stairways shuuld not be less than 4 inches nor exceed 7 <br /> [� y� �K inches, and runs ,hould not be less than 11 inches. Section 3306(c). <br /> � ��'�' QK 17. Landings on stairways require a dimension in the direction of travel <br /> c�. c� equal to the widl'h of the stairway but need not exceed 44" when the : <br /> z �..i`'��+ stair has a straight zun. Section 330G(g). ! <br /> a y�i , <br /> r �y � 18. The top of handrails are to be placed not less then 34 inches nor ; <br /> gH more than 38 inches above the nosing of treads. Section 3306(j). � <br /> d�' Two handrails are required where stairways are 44" or more in width. <br /> � �" I <br /> x y� Ol� 19. Handrails projecting froma wall should haue a space of not less than <br /> ''� ��' 1 1/2 inches between the wall and the handrail. Section�3306(j). � <br /> � <br /> OI� 20. The handgrip portion of h2ndrails should not be less than 1 1/2 I <br /> inches nor more than 2 inches in cross 'sectional dimension or the t <br /> shape should provide an equivalent gripping surface. The <br /> acceptability of equivalent shapes should be determined by the <br /> building official. The handgrip portion should have a smooth surface <br /> � with no sharp corners. Sec':ion 330G(j). <br /> ! '�"' �l� 21. Six foot, 8 inch minimum headroom clearance for stairways should be <br /> indicated on plans. Section 3306(p). Note that t'iis as measured <br /> (-- �..' vertically from a plane tangent to the stairway tread nosing. I <br /> � O� 22. Enclosed usable space under exterior stairs should be protected on + <br /> the enclosed side as required for 1-Hr fire-resistive construction, i <br /> { j Section 3306(m). See also Section 3309(f). ; <br /> O�� 23. Ramps used as exits should comply with Section 3307. <br /> —� � � 24. Portions of buildings should be accessible to the physically <br /> handicapped by means of a ramp or st'airway as requited by Table No. <br /> 33-A. Section 3301(e). <br /> b. . 1 <br /> ' 7 25. Required ramps should have landings at top and �ottom (and for each 5 <br /> � feet of rise). <br /> "� + p/� 26. Ramps required by Table No. 33-A may have slopes which exceed one <br /> foot in 12 feet. If steeper tha.n one foot in U feet, handrails <br /> should be provided as requimd for stairs. Section 3307(c)(e). <br /> � 27. Surface of ramps are required to be roughened or of a non-slip <br /> material. Section 3307(g). <br />