Attachment locations of purlins to rafters, Chapter 7: roof assembly – Grain Systems Tanks PNEG-4105A User Manual
Page 90
![background image](/manuals/277607/90/background.png)
Attachment Locations of Purlins to Rafters
Purlins are horizontal members between the rafters that give support to the roof structure. The length of
the purlin determines its location on the A-frame assembly.
The following reference depicts a completely assembled A-frame roof rafter section with X-bracing
installed. For more information, see the following sections:
Assembling Purlin Number 1, page 103
Assembling Purlin Number 2, page 101
,
Assembling Purlin Number 3, page 99
,
Assembling Purlin Number 5, page 95
Assembling Purlin Number 6, page 92
, and
Assembling Purlin Number 7, page 91
.
Figure 7-13 Location of purlins for a 105 ft (32 m) diameter bins
A
Location of purlin number 1 (CTR-0450)
E
Location of purlin number 5 (CTR-0449)
B
Location of purlin number 2 (CTR-0455)
F
Location of purlin number 6 (CTR-0451)
C
Location of purlin number 3 (CTR-0456)
G
Location of purlin number 7 (CTR-0453)
D
Location of purlin number 4 (CTR-0457)
90
Pneg-4105A 105 Ft Diameter 40-Series Bin