Grain Systems Tanks PNEG-4078 - Manual (Page 82)

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 89 , Assem-
bling Purlin Number 2, page 87 , Assembling Purlin Number 3, page 85 , and Assembling Purlin Number 4,
page 83 .
Figure 7-11 Location of purlins for a 78 ft (23.77 m) diameter bin
A Location of purlin number 1 (CTR-0251) C Location of purlin number 3 (CTR-0253)
B Location of purlin number 2 (CTR-0252) D Location of purlin number 4 (CTR-0254)
82 Pneg-4078 78 Ft Diameter 40-Series Bin