Calculated Industries 4090 User Manual
Page 99
98 — ITI S
HEET
M
ETAL
/HVAC P
RO
Stairs — Given Only the Run
You’re building a stairway with a total Run of 20 Feet. Your desired
Riser height is 7-1/2 Inches and desired Tread width is ten Inches
(default, or preset values). The desired headroom is 6 Feet 8 Inches
and floor thickness 10 Inches (defaults). Find all stair values, then
calculate the Rise.
KEYSTROKE
DISPLAY
1. Enter Run:
o o
0.
2 0 f R
X 20
FEET
0
INCH
2. Find Riser height, number of Risers, Riser Overage/Underage,
Tread width, number of Treads, Tread Overage/Underage, stairwell
opening, Stringer length and Angle of Incline. As a final step, calcu-
late the Rise:
s
R-HT 7-1/2
INCH
s
RSRS 25.
s
R+/– 0
INCH
s
T-WD 10
INCH
s
TRDS 24.
s
T+/– 0
INCH
s
OPEN 10
FEET
0
INCH
s
STRG 25
FEET
0
INCH
s
INCL 36.8699°
s
RUN (
X
)
20
FEET
0
INCH
s
RISE 15
FEET
7-1/2
INCH
STORED