Manual

User's Guide — 73
Irregular (non-45°) Hip/Valley and Jack Rafters —
Descending, with On-Center Spacing Maintained (not
available on LT)
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 Display
1. Find Common rafter length:
[On/C] [On/C] 0.
[Conv] [1] (Temporarily sets fractional rounding to 1/16) 0.
7 [Inch] [Pitch] PTCH 7 INCH
4 [Feet] [Run] RUN 4 FEET 0 INCH
[Diag] DIAG 4 FEET 7-9/16 INCH
2. Enter on-center spacing:
16 [Inch] [Stor] [7] OC 16 INCH
3. Find irregular Hip/Valley rafter length and cut angles:
8 [Inch] [Conv] [Hip/V] IPCH 8 INCH
[Hip/V] IH/V 5 FEET 9-11/16 INCH
[Hip/V] PLMB 23.70°°
[Hip/V] LEVL 66.30°°
[Hip/V] CHK1 41.19°°
[Hip/V] CHK2 48.81°°
(Cont’d)