Ramps and Stairs Flashcards
What is a tread in stair construction?
The flat component that is stepped on.
What is a nosing on a staircase?
The part of the tread on an open staircase that overhangs the back edge of the tread below.
What is the minimum overhang required for the nosing on a staircase?
The nosing must exceed a minimum of 15mm over the back edge of the lower tread.
What is the maximum overhang allowed for the nosing on an open staircase?
25mm
What is a riser in stair construction?
The vertical member between treads.
What is the rise in stair construction?
The measurement from the top of one tread to the top of the next (height of each step).
What is the total rise of a staircase?
The overall height of the staircase.
What is the going of a staircase?
The measurement from the front of the tread to the riser or back of the tread for open staircases.
What is the total going of a staircase?
The overall distance where the stairs start and end.
What is the pitch of a staircase?
The angle of the stairs.
What is a stringer in stair construction?
The side member that treads and risers are connected to. The angle of the stringer is the pitch of the stairs.
What is the maximum pitch for common staircases?
37 degrees
What is the maximum pitch for accessible staircases?
32 degrees
What is the minimum width between handrails for common staircases?
900mm
What is the minimum depth required for a landing?
1200mm deep and clear of swinging doors.
What are the maximum and minimum dimensions for treads and risers in a common staircase?
Maximum rise: 190mm
Minimum tread depth: 280mm
What are the maximum and minimum dimensions for treads and risers in an accessible staircase?
Maximum rise: 180mm
Minimum tread depth: 280mm
What is the maximum safe gap allowed between treads?
The gap must not allow a 100mm sphere to pass through.
What is the required colour contrast for the nosing (leading edge) of stairs?
The nosing must be of a contrasting colour.
What is the maximum allowable ratio/pitch for a ramp?
1:12 ratio
What is the minimum width for a ramp?
1200mm
What is the maximum distance allowed between landings on a ramp?
A landing is required at every 750mm rise, as well as at the top and bottom of the ramp.
What are the minimum length requirements for a ramp landing?
Landings must be at least 1200mm long.
What is the required height for edge protection on a ramp?
Handrails must be 900mm high with a minimum 300mm overhang at the top and bottom of the ramp.
What is the purpose of a 75mm upstand on the edge of a ramp?
To prevent wheels from rolling off the edge of the ramp.
What type of surface finish or treatments are required for ramps to ensure slip resistance?
Slip resistance can be achieved by grooves in timber, special paint coating, or other approved non-slip applications like meshing.
What is the name of the New Zealand Building Standard that contains specific details about accessibility?
D - Access
