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November 9, 1994 Page 2 10. 12. permanent and without a disconnecting switch other than those required for o~ercurrent protection. In Group R Occupancies, wall and floor-ceiling assemblies separatin~ dwelling units or guest rooms from each other and from each other and from public space such as interior corridors and s~rvice areas shall provide airborne sound insulation for walls, and both airborne and impact sound insulation for floor-ceiling assemblies. (Appendix 3501(a)) [103(a)] All such separating walls and floor-ceiling assemblies shall provide an airborne sound insulation equal to that required to meet a Sound Transmission Class (STO) of 50. Penetrations or openings in construction assemblies for piping, electrical devices, recessed cabinets, bathtubs, soffits, Or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or otherwise treated to maintain the required ratings. The rise of every step in a stairway shall be not less than 4 inches nor greater than 7 inches. The run shall be not less than 11 inches as measured horizontally between the vertical planes of the furthermost projection of adjacent treads. The largest tread run or riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. (3306(c)) Stairways shall have handrails on each side. The hand grip portion of handrails shall be not less than 1 1/2 inches nor more thas 2 inches in cross-sectional dimension or the shape shall provide an equivalent gripping surface. Mandrails shall be between 34 and 38 inches above the nosing of treads. They shall be continuous the full length of the stairs. Ends shall extend not less than 6 inches beyond the top and bottom risers and be returned or terminate, in newel posts or safety terminals. (3306(i)) Open sides of steirways and landings more than 30 inches above grade shall be protected by a guardrail not less than 42 inches in height. The top of guardrails for stairways, exclusive of their landings may have a height as specified in Section 3306(j) for handrails. (Not less than 34 inches nor more than 38 inches.) O~en stair railings and guardrails shall have intermediate rails or an ornamental pattern such that an object ~ inches in diameter cannot pass through. (12 inch diameter sphere where a stairway for a commercial or industrial-type occupancy is not accessiDle to the public.) (1712) Safety glazing material shall be installed in doors and in locations within a R4-inc~ arq of either vertical edge of the door in a closed position. (5406(d)6) This site, building and facilities are required to be accessible to and useable by the physical/y handicapped. Details and dimensions not shown shall comply with Public Law 101-336, the Americans with Disabilities Act, Part III; Department of Justice Regulations of Friday~ July 26, 1991; 28 C.F.R., Part 36, including Americans with Disabilities Act Accessibility Guidelines (ADAAG) and Public Law 100-430, the Pair Housing Act and the regulations adopted thereunder and the requirements of chapter 31. (3101)