Grain Systems Tanks PNEG-4105A - Manual (Page 80)

Chapter 7: Roof Assembly
Assembling a Laminated Rafter
Laminated rafters nest together to give additional strength and should be assembled before attaching the
upper and lower rafters.
What You Should Know
All the lower rafters are assembled with rafter inserts.
1. Place the lower 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 25 .
Figure 7-6 Laminated rafter
A Lower rafter (CTR-0452) C 1/2 x 1-3/4 in. flange bolt (S-10252)
B Rafter insert (CTR-0448) D 1/2 in. flange nut (S-10253)
After You Finish
Repeat this process for the remaining laminated lower rafters.
Assembling the Rafters
For the larger bins (90–105 ft.) each rafter will consist of a two piece design and will need to be spliced
together for assembling the A-frames.
1. Locate an upper rafter (A) and a lower rafter (B), and find the series of twelve holes on each end of
the upper rafter (A) and a lower rafter (B).
NOTE: Assemble rafters with the flanges facing in the same direction.
2. Place the lower rafter (B) to the outside mating surface of the upper rafter (A), and align the series of
twelve holes together.
3. Install flange bolts (C) and flange nuts (D), and tighten hardware to the recommended torque specifi-
cations. See Bolt Torque Specifications, page 25 .
80 Pneg-4105A 105 Ft Diameter 40-Series Bin