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12 — C
ONSTRUCTION
M
ASTER
®
P
RO
/ T
RIG
/ D
ESKTOP
When calculating Regular and Irregular Jack rafter lengths, you will
see the letters “JK” (Regular pitch side) or “IJ” (Irregular pitch side)
and the corresponding jack number to the left of your calculator dis-
play. This will help you keep track of the descending sizes and which
side the corresponding rafter is based on.
H
Hip/Valley Rafter
— Finds the Regular or Irregular
Hip/Valley
rafter length.
• Regular Hip/Valley Length: After right
triangle/rafter values are entered or calculated
(e.g., Pitch, Rise, Run), pressing H will calcu-
late the length of the
Regular
Hip/Valley rafter.
• Irregular Hip/Valley Length: If an irregular
pitch is entered (see next definition), pressing
H will calculate the
Irregular
Hip/Valley rafter
length. (An Irregular or “non-standard” roof has
two different Pitches/Slopes.)
• Subsequent presses of the H key will also
display plumb, level, and cheek cut angle values
in degrees.
Ç H
Irregular Pitch (Ir/Pitch)
— Enters the irregular or
secondary pitch value used to calculate lengths of
the irregular hip/valley and jack rafters.
You may enter the irregular pitch as:
• a dimension: 9 i Ç H
• an angle: 3 0 Ç H
• a percentage: 7 5 % Ç H
Note: An entered irregular pitch can be recalled by pressing
®
Ç H
.
j
Jack Rafters
— Finds the descending
Jack
rafter
sizes for
regular
pitched roofs, based on the stored
On-center spacing and previously entered or calcu-
lated right triangle/rafter values (e.g., pitch, rise, run).
Repeated presses of the
j
key will display the incremental
jack adjustment, all the rafter sizes (on the Regular pitch side) as
well as display the plumb, level, and cheek cut angle values.
Additional presses will display the rafter sizes on the Irregular
pitch side (if an Irregular Pitch was entered; see above), or
repeat the previously displayed values.
(Cont’d)
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