Pocket RefeRence Guide — 26
REGuLAR HIP/vALLEY
AND JACK RAFTERS
A roof’s Pitch is 225 mm and half the total
span is 1800 mm. Find the lengths of the
Common, Hip/Valley and Jack rafters. Also
ndtheincrementaljackadjustmentand
the cut angles. (Jack rafters at 400 mm On-
center spacing.)
KEYSTROKE DISPLAY
oo
0.
1. Find the Common rafter length:
1800MR
RUN 1800.
MM
225Mp
PTCH 225.
MM
d
(Common)
DIAG 2237.309
MM
2. Enter On-Center spacing
400MQ5
(o.c.)
OC
@
400.
MM
3. Find the Hip/Valley rafter length and
cut angles; then the incremental jack
adjustment, Jack rafter lengths and cut
angles:
H
H/V 2871.507
MM
j
JKOC
@
400
M
j
JK 1 1740.129
MM
j
JK 2 1242.949
MM
j
JK 3 745.7696
MM
j
JK 4 248.5899
MM
j
JK 5 0.
MM
IRREGuLAR HIP/vALLEY
A roof has a 225 mm Pitch, an irregular Pitch
of 300 mm, and half the span is 2000 mm.
Solve the Hip/Valley length. On-center spacing
is 400 mm.
KEYSTROKE DISPLAY
oo
0.
1. Find Common rafter length:
225Mp
PTCH 225.
MM
2000MR
RUN 2000.
MM
d
DIAG 2485.899
MM
2. Enter On-center spacing and irregular Pitch;
ndirregularHiprafter:
400MQ5
(o.c.)
OC
@
400.
MM
300M
QH
(lr/Pitch)
IPCH 7-7/8
INCH
M
300.
MM
H
IH/V 2903.393
MM
RAKE-WALL – NO BASE
Find each stud size in a Rake-Wall with a
peak of 1000 mm, and a length of 1500 mm.
Use 400 mm as your On-center spacing:
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