Laserfiche WebLink
mm). Risers shall be vertical or sloped from the underside of the leading edge of the tread <br /> above at an angle not more than 30 degrees (0.51 rad) from the vertical. Open risers are <br /> permitted, provided that the opening between treads does not permit the passage of a 4-inch <br /> diameter(102 mm) sphere. <br /> Exceptions: <br /> 1. A nosing is not required where the tread depth is a minimum of 11 inches (279 mm). <br /> 2. The opening between adjacent treads is not limited on stairs with a total rise of 30 <br /> inches (762 mm) or less. <br /> 8311.5.4 Landings for stairways. <br /> There shall be a floor or landing at the top and bottom of each stairway. <br /> Exception: A floor or landing is not required at the top of an interior flight of stairs, including <br /> stairs in an enclosed garage,provided a door does not swing over the stairs. <br /> A flight of stairs shall not have a vertical rise larger than 12 feet (3658 mm) between <br /> floor levels or landings. <br /> The width of each landing shall not be less than the width of the stairway served. Every <br /> landing shall have a minimum dimension of 36 inches (914 mm) measured in the direction of <br /> travel. <br /> R311.5.5 Stairway walking surface. <br /> The walking surface of treads and landings of stairways shall be sloped no steeper than one <br /> unit vertical in 48 inches horizontal (2-percent slope). <br /> 8311.5.6 Handrails. <br /> Handrails shall be provided on at least one side of each continuous run of treads or flight <br /> with four or more risers. <br /> R311.5.6.1 Height. <br /> Handrail height, measured vertically from the sloped plane adjoining the tread nosing, or <br /> finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 <br /> inches (965 mm). <br /> R311.5.6.2 Continuity. <br /> Handrails for stairways shall be continuous for the full length of the flight, from a point <br /> directly above the top riser of the flight to a point directly above the lowest riser of the flight. <br /> Handrail ends shall be returned or shall terminate in newel posts or safety terminals. <br /> Handrails adjacent to a wall shall have a space of not less than 1'/2 inch(38 mm) between the <br /> wall and the handrails. <br /> Exceptions: <br /> 1. Handrails shall be permitted to be interrupted by a newel post at the turn. <br /> 2. The use of a volute, turnout, starting easing or starting newel shall be allowed over <br /> the lowest tread. <br /> R311.5.6.3 Handrail grip size. <br /> All required handrails shall be of one of the following types or provide equivalent <br /> graspability. <br /> 1. Type I. Handrails with a circular cross section shall have an outside diameter of at <br /> least 1 1/4inches (32 mm) and not greater than 2 inches (51 mm). If the handrail is not <br /> circular it shall have a perimeter dimension of at least 4 inches (102 mm) and not <br /> greater than 6%4 inches (160 mm) with a maximum cross section of dimension of 21/4 <br /> inches(57 mm). <br /> kcollison/heilman/C1005-013(1409 Madrona) `� <br />