Internal stairs

Internal staircases

Where change in level is 300mm or greater, steps should be provided in addition to ramp.
The minimum headroom above the stair pitch line is 2100mm.
Single steps should be avoided as cause a trip hazard.
Open risers should be not be used in public buildings.
Surface finishes should be firm, easy to clean and maintain.
The steps should be finished in slip-resistant material.
The finish should visually contrast with landing surfaces to help identify the top and bottom of the flight. If different materials are used their frictional characteristics should be similar to avoid trip hazard.

The maximum number of steps between landings is 12.
Spiral stairs and tapered treads should not be provided for use by the general public.
Where stairs have more than 36 risers in consecutive flights there should be at least one change in direction between flights.
Intermediate landing area to be provided on internal stairs over 12 steps.
Pattern surfaces should be avoided around stairs.
Circular stairs should be avoided.

The maximum number of steps between landings is 12.
Intermediate landing area to be provided on internal stairs over 12 steps.
Pattern surfaces should be avoided around stairs.
Circular stairs should be avoided.
Windows or doors should not open into landing areas by stairs
Headroom of 2100mm
On large stairs, intermediate landing areas with tactile warnings to be provided.

Dual height handrails on both sides of interior steps
Handrails on continuous inside edge of stairs with a switchback
Stairs with a change in level greater than 500 mm must have continuous handrails on both sides with a 300 mm horizontal extension at its ends.
The handrail should be mounted at a height of 900 mm. An additional handrail shall be provided at a height between 650 mm and 750 mm.
Handrails must be separated from the wall surface at least 40 mm. The handrail section and its mounting system should not interfere with the continuous gripping surface.
Handrails must have a contrasted reflectance of at least 30 points LRV against its background.

For both steps and ramps handrails are to be installed. For ramps or steps wider than 2100mm a intermediate handrail shall be used.
When the stair widths are greater than 2100 mm an additional intermediate handrail should be installed. The width between intermediate handrails should be at most 2100 mm.
The handrail should be mounted at a height of 900 mm. An additional handrail shall be provided at a height between 650 mm and 750 mm.
The handrails must be safely secured. Handrails must have an anatomical design that allows adjustment to the hand with a circular section of 30 mm to 40 mm diameter or an equivalent gripping surface.

Dimensions