Grain Systems Tanks PNEG-4090A - Manual (Page 84)

Chapter 7: Roof Assembly
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 95 , Assem-
bling Purlin Number 2, page 93 , Assembling Purlin Number 3, page 91 , Assembling Purlin Number 4,
page 89 , Assembling Purlin Number 5, page 87 , and Assembling Purlin Number 6, page 85 .
Figure 7-13 Location of purlins for a 90 ft (27.4 m) diameter bins
A Location of purlin number 1 (CTR-0430) D Location of purlin number 4 (CTR-0433)
B Location of purlin number 2 (CTR-0431) E Location of purlin number 5 (CTR-0434)
C Location of purlin number 3 (CTR-0432) F Location of purlin number 6 (CTR-0435)
84 Pneg-4090A 90 Ft Diameter 40-Series Bin