User Manual

68 — C

ONSTRUCTION

ASTER

/ T

RIG

/ D

ESKTOP

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 main-

tained 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:

o o 0.

7 i p PTCH 7 INCH

4 f R RUN 4 FEET 0 INCH

d DIAG 4 FEET 7-9/16 INCH

2. Enter on-center spacing:

1 6 i ß 5 OC STORED 16 INCH

3. Find irregular Hip/Valley rafter length and cut angles:

8 i Ç H IPCH 8 INCH

H IH/V 5 FEET 9-11/16 INCH

H PLMB 23.70°

H LEVL 66.30°

H CHK1 41.19°

H CHK2 48.81°

(Cont’d)

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