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U
SER
’
S
G
UIDE
— 71
Number of Risers: The number of risers includes both the first and
the last riser of the stairway.
Riser Overage or Underage: The riser overage or underage is the
difference between the “floor-to-floor” rise and the total height of all
of the risers. Many times the riser height does not divide evenly into
the floor-to-floor rise and a small fraction of an inch is left over. A
positive remainder is an overage, while a negative remainder is an
underage.
Tread Width: The width of each tread is measured from the front of
one riser to the front of the next riser. The width of each tread does
NOT include the nosing or overhang of the tread. The nosing or
overhang of a tread is the rounded front of the tread that projects
beyond the face of the riser.
Number of Treads: The number of treads is one less than the
number of risers.
Tread Overage or Underage: The tread overage or underage is the
difference between the run or horizontal space that a stairway must
fit into and the total width of the treads. Similar to the riser
overage/underage, many times the total width of the treads does not
divide evenly into the run or horizontal space for the stairway and a
small fraction of an inch is left over. A positive remainder is an over-
age, a negative remainder is an underage.
Stringers: Also called carriages, stair horses or stair jacks. Stringers
are the diagonal members that support the treads and risers.
Angle of Incline: The angle of incline of the stairway is determined
by the rise and run of each stair. The angle of incline should not be
confused with the pitch of the stairway. The pitch of a stairway is the
angle based on the floor-to-floor rise and the horizontal run of the
stairway. The angle of incline is based on the “actual” riser height
and the “actual” tread width of the stair.
Stairwell Opening: The length of the opening at the top of the
stairs. The computation is based on the headroom height (the
desired spacing between the stairs and upper floor ceiling) and
thickness of the upper floor where the opening is located.
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