Staircase Width
The width of one stair after all will need to be consistent with the rest of the stairs.
Staircase width. Width refers to the length of risers and treads from side to side. For code requirements the minimum staircase width is the horizontal dimension between the sidewalls of a staircase measured above the handrails. 150 min 1 2 0 0 m i n 800 900 30 min 150 1 2 0 0 mn m i n minimum landing space detectable warning surface min width of ramp. A stairway staircase stairwell flight of stairs or simply stairs is a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances called stepsstairs may be straight round or may consist of two or more straight pieces connected at angles.
Staircase identification is to facilitate fire fighting operation. 1200 mm accessibility around and within the building handrails handrails circular section between 32 50. The minimum clear width below the handrail is 26 inches. A spiral staircase may take up only half the room of a standard staircase and therefore it is useful where space is an issue.
Staircase identification every staircase must be given a means of identifying it irrespective of the height of the building. This chapter stipulates the requirements pertaining to the type width number and arrangement of exits travel distances and exit capacity. If the staircase is only a secondary one and serves only one room though it should be 60mm wide with a rise of 220mm and step length of no more than 145mm. For secondary staircases a minimum width of 600mm is recommended.
So we know from appendix c that stair width in part b is defined as being clear width between the walls or balustrades. 233 a stair of acceptable width for everyday use will be suf cient for escape purposes but if it is also a fire fighting stair it should be at least 1100mm wide see appendix c for measurement of width. The minimum staircase width is the same as the minimum circulation zone width of 3ft 091m. Width of ramps that are part of accessible routes corridor and paths shall comply with table 3 and cl 421.
Under staircase dimensions mistake ive come across several homes where this staircase design mistake has been made. Headroom is the vertical dimension from the stair treads to the ceiling directly above. If it acts as your main staircase meaning it serves two or more rooms a spiral staircase should be 800mm wide with a maximum rise of 220mm. It must follow the standards of all staircases such as having at least one handrail although there is one exception.
The stairs width usually varies depending on the type of building the staircase is in but for a normal residence the standard tends to be 3 feet 6 inches 1067 cm.