42' and 48' roof instructions – Grain Systems Tanks PNEG-4042 User Manual
Page 86
12. Support Ring Instructions
86
PNEG-4042 40 Series 42' and 48' Diameter Bins
42' and 48' Roof Instructions
1. 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 on
. The top stiffener bolts
should be left loose. The roof stiffener bracket fits inside the wall stiffeners.
3. Install the eave clips as shown on
. Every third clip should be located at a roof stiffener.
NOTE: 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. 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 “Z” collar at the correct center height, 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 “Z” collar using 5/16" x 1" bolts (do not tighten the bolts at this
time). Be sure to use 5/16" washers on the slots in the truss clip. Complete bolting to the roof stiffener
bracket. The truss assembly must be stabilized at this point.
6. Place two (2) roof sheets on the truss assembly, one on each side of the rafter. The 5/16" x 1" bolts
in the “Z” collar must be removed and replaced through each roof sheet as they are positioned.
Use 5/16" x 1" bolts to connect the roof sheet ribs to the truss assembly. Be sure at least two (2)
5/16" x 1" 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.
7. Repeat
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.
Install the tension rods as shown in
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.
10. Install the flattop as shown in
. For bins with a dome cap option, the small center collar, roof
flashing and roof cap assembly can be installed as a complete unit. Be sure to tighten all connections
in the roof rafter system and related parts.
11. Apply the peak load on the flattop on the second (2
nd
), lower “Z” collar.