Understanding how domestic staircases are measured:
1) The fist thing you must establish is the Total Rise as shown below:
2) Once you have must decide how many risers the stair is to be:
– The maximum rise on a domestic staircase is 220mm
– Divide total rise by 220 then round up
– or use the table below
3) So if total rise = 1050mm
1050 / 220 = 4.7 which rounds up to 5 (or refer to table)
4) To establish ind. Rise divide total rise by number of risers;
1050mm / 5 = 210 mm
As shown below:
5) You need to know the corresponding ind going;
– Building regulations say a minimum of 220mm going is necessary, however the pitch must also be no more than 42°
– Please see chart below for this:
6) Apply ind going to each tread;
– Ind going is the tread length and as such you do not including the nosing overhang when measuring it.
7) Calculate total going;
– Total going is the total amount of floor space the stair will take up from where it lands on the joist to the front of the first nosing.
And can be calculated as (total number of treads * ind going) + Nosing overhang (20mm) + back riser (9mm)
As shown below;
Total going = 234 (ind go) * 4 (no. of treads)
+ 22mm (nosing overhang) + 9mm (back riser)
= 965 mm
Reflection: This article shows how to draw stairs, and the STAIRS STANDARDS. In my Technology class, my teachers taught the rise and joist of the stairs. And this article shows the clearly picture that make know the Stairs more clearly.