9
GROWSPAN
™
ROUND PREMIUM HIGH TUNNELS
Revision date: 11.19.21
FRAME ASSEMBLY
Gather the parts:
• All Rafter Assemblies
• Pipe 1.315'' x 75'' swaged (#131S075)
• Pipe 1.315'' x 73.5'' plain (#131P0735)
• 5/16" x 2-1/2" machine bolts (#FAG336B)
• 5/16" Nuts (#FALB02B)
• Lifts, ladders, and assistants
Frame Assembly Procedure
1. Using the proper lifts and with assistance, carefully
stand the first end rafter—one with end clamps—and
place the leg pipes into the first set of ground posts.
2. Secure the leg pipes to the ground posts using the
5/16" x 2-1/2" machine bolts and nuts.
4. Place an interior rafter–one without clamps—into the
next set of ground posts. Secure the leg pipes to the
ground posts as previously described.
5. Position one (1) cross connector (102548) near the top
of the interior rafter assembly.
6. With assistance, take one (1) swaged 75" purlin
sections (#131S075) and insert the plain end through
an end clamp on the end rafter. Next, insert the tapered
end through a cross connectors near the top of the
interior (or second) rafter as shown above.
Saddle the purlin pipe in the joint where the rafter pipes
are connected to keep purlins aligned during assembly.
7. Repeat the previous step to install a second purlin
section. See the above diagram for details.
8. Verify that both rafters are plumb and properly spaced
(4' on center).
9. Tighten the 102548 cross connectors on the interior
rafter and tighten the end clamps installed at the end
rafter to secure the first sections of purlin pipe.
NOTE:
Do not allow the plain end of any purlin to
extend beyond the end of the end rafter. Align with the
center of the rafter for best results and to prevent cover
damage.
Inside of
Shelter
Outside of
Shelter
Rafter
Ground
Post
IMPORTANT:
Brace
the first rafter in
position as needed to
keep it from moving.
Bracing is removed
after
additional
rafters are installed
and secured to the
other rafters.
3. Verify rafter is plumb and brace it in place using cables,
ropes, or dimensional lumber. Leave bracing in place
until additional rafters and purlins are installed.
NOTE:
Rafter above is used to illustrate bracing. Actual
rafter may differ in design or width or both.
4'
center-to-center
Interior Rafter
102548
End clamp for
top, center purlin
To the
inside of
the shelter
Rafter
Joint
End Rafter