THOMSON Construction Master Pro, Workbook

Page: 12 / 18

Sample
68 Part C
■
Framing
KEYSTROKE DISPLAY
j
JK 11 2 FEET 1 INCH
j
JK 12 0 FEET 5 INCH
j
JK 13 0 FEET 0 INCH
j
PLMB 36.87°
j
LEVL 53.13°
j
CHK 1 45.00°
Roofs containing two different pitches are called irregular or nonstan-
dard roofs. Hip and valley rafters joining roof sections of different pitches
each represent the diagonal of a rectangle as shown in Figure 6-8. For such
constructions, one of the common rafters is designated as having a “regu-
lar pitch,” while the other common rafter (of different pitch) is said to have
an “irregular pitch.” Note from the figure that the number of regular jack
rafters is generally not equal to the number of irregular jack rafters, and
that placement of these rafters may not “match” or coincide, even if an
equal o.c. spacing is used for both sets of jack rafters. All of the required
data for such hip/valley and jack rafters are readily available using your
Construction Master Pro calculator.
Notes
Construction Master® Pro Workbook and Study Guide
Copyright © 2007 by Calculated Industries, Inc.
and Thomson Delmar Learning
Hip
Common
Common
CHK1
JK1 JK2 JK3
Figure 6-7
Calculator Tip
Coinciding Jacks:
Regular and irregular
jacks can be set to
“match” or coincide; see
Setting Preferences in
User’s Guide for more
details.