Graphical Construction Glossary >> stairs. >> general >> Step Rise and Tread
Toe or toe space. In the above sketch:-
Stairs built without toe space, particulary steep ones are abominations and a permanent reminder of the ignorance and incompetance of their builders.
Below is a table that appears in the BCA (Building Code Of Australia and while it may not be exactly the same as your own code, it is a good basis to work on for anyone who has not got a code to work to.
Note! The table above is for straight flights of steps. Landings are exluded from the slope relationship calculations. For Rise and Going dimensions for spiral stairs and winders see the relevant pages.
The slope ratio of twice the RISE plus the GOING stops you from choosing a slope that is a bit extreme, like a maximum or minimum (G) and (R) together.
A single step, that is one rise in between two level areas in residential construction, as far as I know is not mentioned in building regulations, so I guess that it must comply somewhere with the tabel above. The table states the maximum of 190. so if the difference in level is 250, then put in two steps at 125 rise.
To recap. Rise and Going are dimensions used in calculations and setting out stair flights and landings.
Treads and Risers are physical materials.
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