Calculated Industries 4045-B - Manual (Page 10)

10 — Construction Master IV
[Jack] — Jack Rafter Key
Finds the jack rafter sizes – from
largest to smallest – for both regular
and irregular pitched roofs. The ini-
tial jack rafter values displayed are
from the regular pitched side. After
showing the minimum value, the cal-
culator will display the sizes for the
irregular pitched side. An on-center
spacing can be entered by pressing
[Jack] (i.e., 12 [Inch] [Jack]). The
default spacing is 16 inches (Metric
Mode: 600 millimeters).
[Conv] [Jack] — Irregular Side Jacks
Operates same as [Jack], but dis-
plays the irregular pitched side jack
rafters first. The calculator uses the
same on-center spacing as the regu-
lar pitch sided jack rafters unless a
new on-center spacing is entered
(e.g., 19.2 [Inch] [Conv] [Jack]).