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BUILDING PLANNING • • • R311.5.63 Handrail grip size. All required handrails R311.63 Handrails required. Handrails shall be provided shall be of one of the following types or provide equiva- on at least one side of all ramps exceeding a slope of one unit lent graspability. vertical in 12 units horizontal (8.33 -percent slope). 1. Type I. Handrails with a circular cross section shall 8311.6.3.1 Height. Handrail height, measured above the have an outside diameter of at least 11/4 inches (32 finished surface of the ramp slope, shall be not less than mm) and not greater than 2 inches (51 mm). If the 34 inches (864 mm) and not more than 38 inches (965 handrail is not circular it shall have a perimeter di- mm). mension of at least 4 inches (102 mm) and not R311.63.2 Handrail grip size. Handrails on ramps greater than 61/4 inches (160 mm) with a maximum shall comply with Section R311.5.6.3. cross section of dimension of 21/4 inches(57 mm). 2. Type H. Handrails with a perimeter greater than 61/4 8311.6.33 Continuity. Handrails where required on inches (160 mm) shall provide a graspable finger re- ramps shall be continuous for the full length of the ramp. e. The finger re- cess area on both sides of the profile. Handrail ends shall be returned or shall terminate in cess shall begin within adistance of 3/4 inch (19 mm) newel posts or safety terminals. Handrails adjacent to a measured vertically from the tallest portion of the wall shall have a space of not less than 1.5 inches (38 profile and achieve a depth of at least S/t6 inch (8mm ) between the wall and the handrails. mm) within V. inch (22 mm) below the widest por- tion of the profile. This required depth shall con - SECTION 312 tinue for at least 3/g inch (10 mm) to a level that is not less than 13/4 inches (45 mm) below the tallest por- tion of the profile. The minimum width of the hand- R312.1 Guards required. Porches, balconies or raised floor rail above the recess shall be 11/4 inches (32 mm) to a surfaces located more than 30 inches (762 mm) above the floor maximum of 23/4 inches (70 mm). Edges shall have or grade below shall have guards not less than 36 inches (914 a minimum radius of 0.01 inches (0.25 mm). mm) in height. Open sides of stairs with a total rise of more than R311.5.7 Illumination. All stairs shall be provided with il- 30 inches (762 mm) above the floor or grade below shall have r lumination in accordance with Section R303.6. guards not less than 34 inches (864 mm) in height measured , vertically from the nosing of the treads. R311.5.8 Special stairways. Circular stairways, spiral stairways, winders and bulkhead enclosure stairways shall Porches and decks which are enclosed with insect screening comply with all requirements of Section R311.5 except as shall be provided with guards where the walking surface is lo - specified below. cated more than 30 inches (762 mm) above the floor or grade below. R311.5.8.1 Spiral stairways. Spiral stairways are per- miffed, provided the minimum width shall be 26 inches R312.2 Guard opening limitations. Required guards on open (660 mm) with each tread having a 7'/2 -inches (190 mm) sides of stairways, raised floor areas, balconies and porches minimum tread depth at 12 inches from the narrower shall have intermediate rails or ornamental closures which do edge. All treads shall be identical, and the rise shall be no di- not allow passage of a sphere 4 inches (102mm) or more in di - more than 9'/Z inches (241 mm). A minimum headroom ameter. of 6 feet 6 inches (1982 mm) shall be provided. Exceptions: R311.5.8.2 Bulkhead enclosure stairways. Stairways 1. The triangular openings formed by the riser, tread and serving bulkhead enclosures, not part of the required bottom rail of a guard at the open side of a stairway are building egress, providing access from the outside grade permitted to be of such a size that a sphere 6 inches level to the basement shall be exempt from the require- (152 mm) cannot pass through. ments of Sections R311.4.3 and R311.5 where the maxi- 2. Openings for required guards on the sides of stair mum height from the basement finished floor level to treads shall not allow a spher 31g 'nches (107 mm) to grade adjacent to the stairway does not exceed 8 feet pass through. (2438 mm), and the grade level opening to the stairway is covered by a bulkhead enclosure with hinged doors or other approved means. SECTION R313 R311.6 Ramps. SMOKE ALARMS R311.6.1 Maximum slope. Ramps shall have a maximum IF] 8313.1 Smoke alarms. Smoke alarms shall be installed in slope of one unit vertical in eight units horizontal (12.5 -per- the following locations: cent slope). 1. In each sleeping room. R311.6.2 Landings required. A minimum 3 -foot -by -3 -foot 2. Outside each separate sleeping area in the immediate vi - (914 mm by 914 mm) landing shall be provided: cinity of the bedrooms. 1. At the top and bottom of ramps, 3. On each additional story of the dwelling, including base - 2. Where doors open onto ramps, ments but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and 3. Where ramps change direction. without an intervening door between the adjacent levels, 2003 INTERNATIONAL RESIDENTIAL CODE® 51 • • •