Grain Systems Tanks PNEG-4090 - Manual (Page 74)

Chapter 7: Roof Assembly
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 24 .
Figure 7-6 A-frame assembly (Note: complete A-frame assembly shown for clarity)
A Upper rafter (CTR-0012) C 1/2 x 1-3/4 in. flange bolt (S-10252)
B Lower rafter (CTR-0011) D 1/2 in. flange nut (S-10253)
After You Finish
Repeat this procedure for the remaining rafters.
74 Pneg-4090 90 Ft Diameter 40-Series Bin