11
Revision date: 01.01.20
GROWSPAN
™
ROUND PREMIUM EXTRA TALL HIGH TUNNELS
ASSEMBLE AND PRE-MARK THE PURLINS
Pre-marking the purlins speeds the assembly process
and eliminates the need to measure each purlin as it is
installed. In addition, these steps ensure that an accurate
spacing of the rafter assemblies is achieved.
ATTENTION:
Do not assemble the upper purlin (1.90") at
this time
. Assemble only the two (2) purlins that use 1.315"
diameter pipe.
Required Pipe:
• 1.315" x 75" swaged pipe (#131S075)
• 1.315" x 73.5" plain pipe (#131P0735)
NOTE:
Purlins are part of the assembled frame and run
perpendicular to the rafter assemblies.
The top purlin consists of eight (8) 1.90" x 99" (#190S099)
swaged pipes and one (1) 1.90" x 96" (#190P096) plain
pipe.
The remaining purlins consists of eleven (11) 1.315" x
75" (#131S075) swaged pipes and one (1) 1.315" x 73.5"
(#131P0735) plain pipe.
1. Select the required pipe sections for one purlin and
connect these by inserting the swaged ends of the
pipes into the plain ends until the entire purlin is
assembled.
NOTE:
Assemble the purlins in a location that is
accessible during the assembly of the frame, but will
not interfere with the process of lifting and setting the
rafters.
2. Verify that each pipe joint is properly seated.
NOTE:
These pipes are taken apart during the
assembly procedure. Do not fasten them together at
this time.
3. For the 72" rafter spacing, measure 72-3/4" from the
short plain pipe, used to complete each purlin run, of
the assembled purlin, and mark the distance on the
pipe.
NOTE:
This first measurement is three-quarters (3/4)
of an inch longer than the on-center rafter spacing
to account for the length of purlin pipe that extends
through the end purlin clamp of the first end rafter.
4. From the location marked in the previous step,
measure seventy-two inches (72") and make another
mark.
5. Continue to mark the purlin in 72" intervals until all
locations are marked. These marks help to maintain
the 72" on-center rafter spacing of the shelter during
assembly.
6. Repeat this procedure until all assembled purlins are
marked.
7. After assembling all rafters and pre-marking the purlins,
continue with assembling the frame.
FRAME ASSEMBLY
Gather the parts
• All rafter assemblies
• 1.315" pre-marked purlins
• Pipe 1.90'' x 99'' swaged (#190S099)
• Pipe 1.90'' x 96'' plain (#190P096)
• Stuts - 5' (#QH1304)
• 5/16" x 2-1/2" machine bolts and 5/16" nuts
• Lifts, ladders, and assistants
Frame Assembly Procedure:
After all rafters are constructed and placed in an orderly
fashion for frame assembly, proceed with standing the first
end rafter.
Forklifts and personnel booms are recommended for lifting
and setting the rafters. Consult a construction professional
if you are not familiar with construction techniques and
erecting similar structures.
ATTENTION:
Use the proper lifts. Rafter assemblies are
heavy and awkward to handle.
1. Using the proper lifts and with assistance, carefully
stand the first end rafter assembly and place the leg
pipes over the first set of ground posts.
2. Brace the first rafter using rope, cable, or some other
form of temporary bracing to hold the rafter in position.
Use a level (or other leveling device) to plumb the end
rafter.
