Chapter 18 Stair Construction
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The platform type includes landings where
the direction of the stair run is usually changed.
Such descriptive terms as L-type (long L and
wide L), double L-type, and U-type (wide U and
narrow U) are commonly used. See Figure 18-3.
In split-level houses, platform stairs with
short and generally straight runs are used.
Usually, stair runs of this type are located so
that the stair run directly above automatically
provides headroom, Figure 18-4.
The straight run stairway is continuous
from one fl oor level to another without land-
ings or turns. It is the easiest to build. Standard
multistory designs require a long stairwell in
the fl oor above to provide headroom. This often
presents a problem in smaller structures. A long
run of 12 to 16 steps also has the disadvantage of
being tiring. It offers no chance for a rest during
ascent.
Platform: A horizontal section between two fl ights of
stairs. Also called a landing.
Straight run: A stairway that does not change
direction.
Stairwell: The rough opening in the fl oor above to
provide headroom for stairs.
Straight run
Wide U
Narrow U
Double L
Wide L
Long L
Figure 18-3. Terms used to defi ne various stair types.