Attachment locations of purlins to rafters, Chapter 7: roof assembly – Grain Systems Tanks PNEG-4105 User Manual
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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 101
,
Assembling Purlin Number 2, page 99
,
Assembling Purlin Number 3, page 97
,
Assembling Purlin Number 5, page 92
, and
Assembling Purlin Number 6, page 91
.
Figure 7-12 Location of purlins for a 90 ft (27.4 m) and 105 ft (32 m) diameter bins
A
Location of purlin number 1 (CTR-0096)
D
Location of purlin number 4 (CTR-0102)
B
Location of purlin number 2 (CTR-0098)
E
Location of purlin number 5 (CTR-0103)
C
Location of purlin number 3 (laminated) (CTR-
0101)
F
Location of purlin number 6 (CTR-0104)
Pneg-4105 105 Ft Diameter 40-Series Bin
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