Calculated Industries 4065 v3.1 Pocket Reference Guide Advanced Consnruction-Math - Manual (Page 30)

P OCKET R EFERENCE G UIDE — 26
Regular Hip/Valley and Jack Rafters
A roof’s Pitch is 255/300 mm and half the
total span is 1800 mm. Find the lengths of
the Common, Hip/Valley and Jack rafters.
Also find the incremental jack adjustment
and the cut angles. (Jack rafters at 400
mm On-center spacing.)
KEYSTROKE DISPLAY
1. Find the Common rafter length:
o o
0.
1 8 0 0 Ç 9 R RUN 1800.
MM
2 2 5 Ç 9 p PTCH 225.
MM
d
(Common) DIAG 2237.
MM
2. Find the Hip/Valley rafter length and cut
angles; then the incremental jack adjust-
ment, Jack rafter lengths and cut angles:
H
H/V 2872.
MM
H
PLMB 27.56°
H
LEVL 62.44°
H
CHK1 45.00°
j
JKOC STORED
400.
MM
j
INCR 497.
MM
j
JK 1 1740.
MM
j
JK 2 1243.
MM
j
JK 3 746.
MM