Irregular Hip/Valley And Jack Rafters - Descending, With On-Center Spacing Maintained - Calculated Industries Sheet Metal/HVAC Pro Calc User Manual

Irregular Hip/Valley and Jack Rafters — Descending, with
On-Center Spacing Maintained
You're working with a 7/12 Pitch and half your overall Span is 4
Feet. The Irregular Pitch is 8/12, and 16-Inch On-Center spacing is
maintained on both sides. Complete the following steps:
(1) Find the length of the Common rafter;
(2) Reset calculator to 16-Inch On-Center spacing;
(3) Enter the Irregular Pitch; find the length of the adjoining
"Irregular" Hip (or Valley) and the cut angles;
(4) Find the Jack lengths on the "Irregular" Pitch side (16-Inch
On-Center spacing);
(5) Find the cut angles;
(6) Find the Jack lengths on the "Regular" Pitch side (16-Inch
On-Center spacing);
(7) Find the cut angles.
KEYSTROKE
1. Find Common rafter length:
o o
7 i p
4 f R
d
2. Enter On-Center spacing:
1 6 i j
3. Find Irregular Hip/Valley rafter length and cut angles:
8 i Ç H
H
H
H
H
H
4. Find Irregular Jack lengths:
Ç j
j*
j
j
*Note: It is not necessary to continue pressing Ç when displaying each Jack rafter
size.
92 — S M
HEET ETAL
/HVAC P
RO
C
ALC
PTCH 7
X 4
FEET
R 4 7-9/16
FEET
JKOC 16
IPCH 8
IH/V 5 9-11/16
FEET
PLMB 23.70162°
LEVL 66.29838°
CHK1 41.18592°
CHK2 48.81408°
IJOC
STORED
IJ1 2
FEET
IJ2 1 4-13/16
FEET
IJ3 0
FEET
DISPLAY
0.
INCH
0
INCH
INCH
INCH
INCH
INCH
16
INCH
9-5/8
INCH
INCH
0
INCH
(Cont'd)