Calculated Industries 4090 - Manual (Page 97)

96 — ITI S
HEET
M
ETAL
/HVAC P
RO
Stairs — Given Only Floor-to-Floor Rise
You’re building a stairway with a total Rise of 9 Feet 11 Inches. Your
desired Riser height is 7-1/2 Inches and desired Tread width is 10
Inches. The desired Headroom is 6 Feet 8 Inches and Floor
Thickness 10 Inches*. Find all stair values, then calculate the Run.
*Note: Headroom and Floor Thickness are required to calculate the height of the stair-
well opening.
KEYSTROKE DISPLAY
1. Enter known Rise:
o o 0.
9 f 1 1 i r Y 9
FEET
11
INCH
2. Recall (default) stored “desired” stair Riser height:
® s R-HT 7-1/2
INCH
3. Find Riser height, number of Risers, Riser Overage/Underage,
Tread width, number of Treads, Tread Overage/Underage, length of
stairwell opening, Stringer length and Angle of Incline. As a final
step, calculate the Run:
s R-HT 7-7/16
INCH
s RSRS 16.
s R+/– 0
INCH
s T-WD 10
INCH
s TRDS 15.
s T+/– 0
INCH
s OPEN 10
FEET
1
INCH
s STRG 15
FEET
6-15/16
INCH
s INCL 36.64003°
s RUN 12
FEET
6
INCH
s* RISE (
Y
) 9
FEET
11
INCH
*Continuous presses of s will also recall stored desired Riser height, Tread,
Headroom and Floor Thickness values.
STORED
STORED