Calculated Industries 4090 - Manual (Page 20)

U
SER
’
S
G
UIDE
— 19
Ç j Irregular Side Jacks — Operates same as j,
but displays the rafter values from the irregular
pitched side first.
STAIR KEY
Your calculator easily calculates stair layout solutions. Given values
for
r (Rise) and/or R (Run), your calculator will calculate Riser, Tread,
Stringer and Angle of Incline values simply by pressing the s key.
s A multi-function key that uses a stored “desired”
Riser height, stored “desired” Tread width, stored
Headroom and Floor Thickness, and entered
r
(Rise) and/or R (Run) values to calculate and dis-
play the following:
Press Result
1 Riser Height
2 Number of Risers
3 Riser Overage/Underage
4 Tread Width
5 Number of Treads
6 Tread Overage/Underage
7 Stairwell Opening
8 Stringer Length
9 Angle of Incline*
10 Run (entered or calculated)
11 Rise (entered or calculated)
12 Stored Riser Height
13 Stored Tread Width
14 Stored Headroom Height
15 Stored Floor Thickness
Note: Default values are 7-1/2 Inches for Desired Riser Height
and ten Inches for Desired Tread Width, ten Inches for Floor
Thickness and 6 Feet 8 Inches for Headroom.
Note: It is not possible for the calculator to include the Nose/
Overhang Measurement. Thus, you need to adjust for this meas-
urement per local codes.
*Note: If the inclination angle exceeds the stored Rise and stored
Run ratio by 10%, the yield symbol (
) will light, indicating a
steep incline.