Design Solutions - Summer 2020 - 50

It is a rare occurrence when the
stairway, regardless of its location,
does not command attention. Whether
by its aesthetic virtues, as a practical
invitation to another level, a means
of escape, or a poorly maintained
hazard to traverse, it is an element
that dictates the involvement of a wide
range of knowledge critical to its design
and execution.
Few such details in the "finish" built
environment must meet such stringent
structural requirements while regulating
the health and safety of the occupants
and facilitating their access and use
of the building. For these reasons,
concurrent stairway design should
be considered essential in the overall
design process to mitigate integration
issues, code violations, project delays,
and cost overruns.

50

I

designsolutions summer 2020

Let's look at the example of a
straight flight of stairs. Begin with
interpreting the architectural plan,
which is often simply shown as a series
of single parallel lines. To some, these
lines represent the leading edge of
each tread, while floor system builders
interpret the top line as the edge of the
well hole. Arguably, the line at the top
of the stair could represent the nosing's
projection past the top riser, or a face
of the top riser, or the rough well. As a
result, interpretations may easily vary
by two to three inches or more which
leads to some well hole framing being
two inches shorter than is required for
the finished product.

Additionally, although rarer, the well
hole width may also be compromised
when wall material thickness changes
or is not considered. It is apparent
how, even in the "simplest" stairway,
collaboration between the designer,
the builder, and the stairbuilder from
the onset could result in enhancement
of the design objectives rather than
compromise the build.
CODE REQUIREMENTS

The potential of compromising the
stairway design can compound when
code requirements are misunderstood.
When the same straight flight of stairs
is drawn with a 10-inch tread depth
(unit run) and the inspector cites the
code requirement of a minimum 11-inch
tread depth, the variance of an inch per
tread has now grown to 15-20 inches in
the flight.



Design Solutions - Summer 2020

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