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18 — S
HEET METAL/HVAC PRO CALC
(Cont’d)
• Subsequent presses of the H key will also dis-
play Plumb, Level, and Cheek cut angle values in
degrees.
Ç H Irregular 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 + 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).
• The default On-Center spacing is 16 Inches. A new
On-Center spacing may be entered and permanent-
ly stored by entering an Inch value prior to perform-
ing the Jack Rafters function (e.g., 1 2 i
j). The current On-Center spacing value can be
viewed by pressing ® j.
• Repeated presses of the j key will display all
the rafter sizes (on the regular pitch side) as well as
display the Plumb, Level, and Cheek cut angle val-
ues. Additional presses will display the rafter sizes
on the Irregular Pitch side (if an Irregular Pitch was
entered; see above), or repeat the previously dis-
played values.
Note: You may set your calculator to display the Jack rafter
lengths in either ascending or descending order (see Preference
Settings on page 107).
Note: You may program your calculator to “mate up” the Jack
rafters, rather than using the entered or default on center for both
sides (see Preference Settings on page 107).
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