Set first jack rafter on 16” or 24" spacing with common rafters.
Measure length from common rafter to first jack rafter and then use standard jack rafter differences, as given in framing square table, to measure lengths of remaining jack rafters along the hip rafter.
12
For 17 pitch
Framing Square Segment
|
Ф|||||П’Т[Ф |
ШГТІтїї |
JFTFjJ |
рттлт |
ф|||||ф|ф |
TTW 8 |
|ЇЇЧПТ |
ПфП|і |
"ІИІ |
||
|
LENGTH COMMON RAFTERS PER FOOT RUN |
21 |
63 |
20 |
81 |
20 |
|||||
|
11 |
HIP OR VALLEY » » |
и |
24 |
74 |
Cs] |
CM О |
23 |
32 |
||
|
DIFF |
IN LENGTH OF JACKS 16 INCHES CENTERS |
28 |
% |
26 и/le |