THOMSON Construction Master Pro - Jack Rafters

Sample
66 Part C
■
Framing
The lengths of these jack rafters for 16⬙ center-to-center spacing are easily
obtained from your calculator, as are the plumb cut, level cut, and cheek
cut angles for these members. (Other spacing distances may also be used;
to enter a 24⬙ spacing, for example, simply press 2 4 i ß 5.)
■ EXAMPLE 6.6
For the framing conditions of Example 6.5, find the required lengths of
jack rafters at an o.c. spacing of 16⬙, as well as the plumb cut, level cut, and
cheek cut angles for these members.
Solution:
Continuing on from the final displayed value (CHK1 45.00°) of Exam-
ple 6.5, successively pressing the j key first displays the default o.c.
spacing of 16⬙, and the incremental decrease in length for each jack
rafter:
Notes
Construction Master® Pro Workbook and Study Guide
Copyright © 2007 by Calculated Industries, Inc.
and Thomson Delmar Learning
Common
Hip
Common
90°
90°
90°
d
Rc
Ri
Rc
D
B
AC
Figure 6-5
Calculator
Version Note
4065 v3.0: Display of
incremental value does
not appear on this
model.
Calculator Tip
Jacks On-Center: The
calculator’s default
setting for jacks is set to
16 inches on-center.