Grain Systems Tanks PNEG-4072A - Manual (Page 74)

Chapter 7: Roof Assembly
Assembling a Laminated Rafter
Laminated rafters nest together to give additional strength and should be assembled before attaching the
purlins and purlin clips.
What You Should Know
All the rafters are assembled with rafter inserts.
1. Place the rafter (A) against the mating surface of the rafter insert (B), and install flange bolts (C) and
flange nuts (D).
NOTE: The top flange of the rafter insert is positioned underneath the top flange of the rafter.
2. Tighten all the hardware to the recommended torque specification. See Bolt Torque Specifications,
page 24 .
Figure 7-6 Laminated rafter
A Rafter (CTR-0419) C 1/2 x 1-3/4 in. flange bolt (S-10252)
B Rafter insert (CTR-0423) D 1/2 in. flange nut (S-10253)
After You Finish
Repeat this process for the remaining laminated lower rafters.
74 Pneg-4072A 72 Ft Diameter 40-Series Bin