Grain Systems Tanks PNEG-4105A - Manual (Page 90)

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 103 ,
Assembling Purlin Number 2, page 101 , Assembling Purlin Number 3, page 99 , Assembling Purlin
Number 4, page 97 , 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