Stairs can also be categorized according to the main types of tread support: Half turn winder staircase or double winder staircase (U-shaped, 180-degree turn),Ĭontinuous stairs are divided into three categories:.Quarter turn winder staircase (L-shaped, 90-degree turn),.Half landing stairs, switchback (U-shaped.Quarter landing stairs (L-shaped, 90-degree turn),.type of stair tread support : stringer stairs, floating stairs (mono stringer, cantilevered stair, suspended staircase).material : wooden staircase, metal, concrete, marble, etc.shape : straight flight staircases, stairs with a turn, continuous stairs, mixed stairs.There are different kinds of stairs, classified by: Handrails serving stepped aisles or ramped aisles are permitted to be discontinuous in accordance with Section 1029.16.1.Please remember : low quality building materials can be responsible for staircase collapse (contains wood imperfection - knots, cracks, checks and voids)
For each 1/ 2 inch (12.7 mm) of additional handrail perimeter dimension above 4 inches (102 mm), the vertical clearance dimension of 1 1/ 2 inches (38 mm) shall be permitted to be reduced by 1/ 8 inch (3.2 mm).Ĥ.Where handrails are provided along walking surfaces with slopes not steeper than 1:20, the bottoms of the handrail gripping surfaces shall be permitted to be obstructed along their entire length where they are integral to crash rails or bumper guards.ĥ. Handrails within dwelling units are permitted to be interrupted by a newel post at a turn or landing.Ģ.Within a dwelling unit, the use of a volute, turnout, starting easing or starting newel is allowed over the lowest tread.ģ.Handrail brackets or balusters attached to the bottom surface of the handrail that do not project horizontally beyond the sides of the handrail within 1 1/ 2 inches (38 mm) of the bottom of the handrail shall not be considered obstructions.
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