Grain Systems Tanks PNEG-1092 - Manual (Page 54)

10. Roof Assembly Instructions
54 PNEG-1092 30° Bin Roof Construction
54'-60' Commercial Roof Instructions
1. Refer to 54'-60' Commercial Roof Assembly instructions on the following pages. Begin roof
construction after assembling the two (2) top sidewall rings. Be sure the sidewall rings are round.
2. Attach the top stiffeners and a 1 ring stiffener as shown in Pages 56 and 57 (NCL) and Page 48
(WCL). The top stiffener bolts should be left loose. The roof stiffener bracket fits inside the wall
stiffeners on inside stiffened tanks.
3. Install the eave clips as shown on Page 61 . Every third clip should be located at a roof stiffener.
The eave clip bolt and nut must be reversed (bolt head on the inside) at the top stiffener for clearance.
4. Roof trusses should be assembled into complete rafters for installation. This should include the roof truss
sections, roof splices, truss channel brackets and roof stiffener clips. Refer to Pages 58-63 . Tighten all
splice bolts with trusses positioned to create a straight truss. (Straight truss assemblies with tight
connections will prevent possible problems in later construction.)
5. After placing the peak ring weldment (CRP-6096 (60') and CRP-6120 (54')) at the correct center
height, refer to Page 50 , begin installation of the truss assemblies. Attach a roof truss assembly to a
roof stiffener bracket with a partially tightened bolt. Raise the top of the truss assembly and bolt to
the peak ring weldment using 3/8" x 1-1/2" bolts (do not tighten the bolts at this time). Be sure to use
3/8" washers on the slots in the attachment clip. Finish bolting the truss assembly to the roof stiffener
bracket. The truss assembly must be stabilized at this point. Attach the “Z” collar supports to the peak
ring at this time. Align one of the bolted “Z” collar seams with the welded peak ring seam and rotate
the “Z” collar counterclockwise to the closest set of holes. The “Z” collar is to be loosely attached to
the “Z” collar supports. Make sure the roof sheets will align properly with the “Z” collar holes. It may
be necessary to field drill the “Z” collar to “Z” collar support holes to allow proper alignment of the roof
sheets.
Refer to Page 60 .
6. Place two (2) roof sheets on the truss assembly, one on each side of the rafter. Use 5/16" x 1-1/4"
bolts to connect the roof sheet ribs to the truss assembly. Be sure at least two (2) 5/16" x 1-1/4" bolts
are placed in each roof sheet at the eave clip connections. These roof sheets will stabilize the roof
truss and center “Z” collar assembly. It is important that the roof sheets are properly aligned with the
“Z” collar. It may be necessary to rotate the “Z” collar slightly to allow proper alignment of the
roof sheets.
7. Repeat Step 5 and Step 6 on the opposite side of the bin and then at the one quarter position
around the bin until four (4) rafter assemblies are erected with two (2) roof sheets each at four (4)
equally spaced positions.
8. Connect the remaining rafter assemblies. Truss channels should be installed with each additional
rafter assembly. Tighten the bolts on one end of the channel with the channel positioned as close as
possible to the roof rafter splice. This will stabilize the truss assembly and hold it in a vertical position.
Place rib support clips under roof panel ribs and bolt to slot in truss channel. Install the 3/4" tension
rods as shown in
Page 61 .
9. After completing the rafter system with all truss channels installed, the remaining roof sheets may be
bolted on the trusses. Be sure to install all roof ladder steps, intermediate eave clips and any other
necessary accessories. Tighten all roof panel bolts at this time.
10. The roof peak platform weldment (CRP-4967) can be installed at this time. Refer to Page 64 for
platform and flashing installation.
11. If a dome cap is to be installed instead of the peak platform weldment, refer to Page 35 for dome cap
installation details.