Grain Systems Tanks PNEG-257 - Manual (Page 42)

7. Roof
42 PNEG-257 12', 15', 18' and 21' Bulk Feed Tanks BFT and GHT Series
15' and 18' Roof Assembly Instructions
After completing first ring assembly, you are ready to begin roof construction. First, build a roof center
support to hold the peak ring in place at the proper height. A simple structure consisting of a sturdy cross
arm attached to a pole and supported by a platform or scaffolding will do. Stand the center support directly
in the center of the tank. The bottom of the peak ring should be 89-5/16" (2269 mm) above the foundation
on the 18' tank and 78-15/16" (2005 mm) above it on the 15' tank. These dimensions are approximate
ones used in BFT construction. Adjusting the center support height will ease roof erection. Refer to
accompanying drawings for details. Install six (6) roof reinforcement angles spaced equally around the
tank. Reinforcement angle edges are parallel with sidewall sheet and peak ring, see views “AA” and “DD”
on Page 43 .
The reinforcement angles utilize every other hole in the peak ring. At the sidewall, there are twelve (12)
spaces between each reinforcement angle on the 18' tank and ten (10) spaces between each on the
15' tank. Next, “skin” the roof by installing the roof panels on the just completed reinforcement structure.
Reinforcement angles will share all roof panels holes, including hole where panel and peak ring attach.
Ensure that all roof seams are caulked and lapped correctly as shown in the accompanying detail drawings.
Figure 7W