Ok here goes .... take two.
Stairs (Other than spiral)
Riser (R) Max 190 Min 115
Going (G) Max 335 Min 240
Slope Relationship (2R+G) 700 Max 550 Min
Stairs (spiral)
Riser (R) Max 220 Min 140
Going (G) Max 370 Min 210
Slope Relationship (2R+G) 680 Max 590 Min
A 125mm sphere must not pass through treads.
There is some information on the calculation points for the slope relationship .... if you are interested get a copy of the building codes of Australia.
Max 3 risers or 570mm before a doorway with no landing.
A 750mm min landing is required following a doorway is there is more than 3 risers or 570mm.
Balustrade required on any level more than 1m above the surface beneath.
Height of balustrade must not be less than 865mm above the nosings of the stair treads or the floor of a ramp.
The height must not be less than 1m above the floor ..... etc
Openings in balustrades must not permit a 125mm sphere to pass through.
The above information is a guide only.
IF IN DOUBT .... ASK THE COUNCIL BUILDING SURVEYOR OR CHECK OUT THE BUILDING CODE OF AUSTRALIA YOURSELF.
Thank you.