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.
