ABSTRACT
The dimensions given above apply to the finished stairs, not to the reinforced concrete part of the stairs. As each staircase must have an equal rise and an equal going for every step between consecutive floors, it frequently means that with different finishes on the floors and stairs the risers at the top and bottom of the concrete stairs have to be adjusted to suit. For example, if we have 2.85 m between finished floors we could have 15 rises of 190 mm each (finish). If we have 50 mm finish on the lower floor, 40 mm finish on the upper floor and 20 mm finish on the stairs, the height of the bottom concrete riser would be 190 + 50 — 20 = 220 mm, and the top concrete riser would be 190 — 40 + 20 = 170 mm. This means that the junctions of treads and risers will not lie on a straight line and will have to be taken into account when determining
Stair spans may be divided broadly into two types, spanning transversely and longitudinally.
