Calculated Industries 44060 - Manual (Page 86)

84 — CONSTRUCTION MASTER   PRO
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 dif-
ference 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 re-
mainder 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, when a nosing or
overhang is used. (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 over-
age/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 overage, 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 con-
fused 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 “ac-
tual” tread width of the stair.