GrowSpan PB01680R4 User manual

1
GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
Photo may show a different but similar model.
STK# DIMENSIONS
PB01680R4 20' W x 12' H x 48' L
PB01690R4 20' W x 12' H x 96' L
©2021 GrowSpan
All Rights Reserved. Reproduction
is prohibited without permission.
GrowSpan™ Round Premium High Tunnels

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
READ THIS DOCUMENT BEFORE YOU BEGIN
Thank you for purchasing this GrowSpan™ high tunnel.
When properly assembled and maintained, this product will
provide years of reliable service. These instructions include
helpful hints and important information needed to safely
assemble and properly maintain the high tunnel. Please
read these instructions before you begin.
If you have any questions during the assembly, contact
Customer Service for assistance.
SAFETY PRECAUTIONS
• Wear eye protection.
• Wear head protection.
• Wear gloves when handling metal tubes.
• Use a portable GFCI (Ground Fault Circuit Interrupter)
when working with power tools and cords.
• Do not climb on the high tunnel or framing during or
after construction.
• Do not occupy the high tunnel during high winds,
tornadoes, or hurricanes.
• Provide adequate ventilation if the structure is
enclosed.
• Do not store hazardous materials in the high tunnel.
• Provide proper ingress and egress to prevent
entrapment.
ANCHORING INSTRUCTIONS
Prior to assembling this high tunnel, please read the MUST
READ document included with the shipment.
WARNING: The anchor assembly is an integral part of
the high tunnel construction. Improper anchoring may
cause high tunnel instability and failure of the structure.
Failing to anchor the high tunnel properly will void the
manufacturer’s warranty and may cause serious injury
and damage.
LOCATION
Choosing the proper location is an important step before
you begin to assemble the structure.
The following suggestions and precautions will help you
determine whether your selected location is the best
location.
• Never erect the structure under power lines.
• Identify whether underground cables and pipes are
present before preparing the site or anchoring the
structure.
• Location should be away from structures that could
cause snow to drift on or around the building.
• Do not position the high tunnel where large loads
such as snow and ice, large tree branches, or other
overhead obstacles could fall.
SITE
After choosing a location, proper preparation of the site is
essential. Follow the information below.
• A level site is required. The site must be level to
properly and safely erect and anchor the structure.
• For sites that are not concrete or gravel, placing wood
blocks or other suitable supports under each rafter leg
helps prevent the pipes from sinking or working into the
site.
• Drainage: Water draining off the structure and from
areas surrounding the site should drain away from the
site to prevent damage to the site, the structure, and
contents of the structure.
WARNING: The individuals assembling this structure
are responsible for designing and furnishing all
temporary bracing, shoring and support needed during
the assembly process. For safety reasons, those who
are not familiar with recognized construction methods
and techniques must seek the help of a qualified
contractor.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
ASSEMBLY PROCEDURE
Following the instructions as presented will help ensure the
proper assembly of your high tunnel. Failing to follow these
steps may result in an improperly assembled and anchored
high tunnel and will void all warranty and protection the
owner is entitled.
The steps outlining the assembly process are as follows:
1. Verify that all parts are included in the shipment. Notify
Customer Service for questions or concerns.
2. Read these instructions, the Must Read document, and
all additional documentation included with the shipment
before you begin assembling the high tunnel.
3. Gather the tools, bracing, ladders (and lifts), and
assistance needed to assemble the high tunnel.
4. Check the weather before you install the roof cover
and any panels (if equipped). Do not install covers or
panels on a windy or stormy day.
5. Re-evaluate the location and site based on the
information and precautions presented in the
documentation included with the shipment.
6. Prepare the site (if applicable).
7. Assemble the frame components in the order they are
presented in these instructions.
8. Assemble the frame including the struts (if equipped).
9. Consult the MUST READ document and properly
anchor the assembled frame.
10. Install, tighten, and secure the end panel and main
cover (if equipped). This applies to fabric covers that
stretch over the frame assembly. Your shelter may
include roof panels or side panels or both.
11. Read the Care and Maintenance information at the end
of these instructions.
12. Complete and return all warranty information as
instructed.
REQUIRED TOOLS
The following list identifies the main tools needed to
assemble the shelter. Additional tools and supports may be
needed depending on the structure, location, and
application.
• Tape measure or measuring device
• Fine point marker to mark the location on tubing.
• Variable speed drill/driver (cordless with
extra batteries works best)
• Wrench, ratchet and socket (recommended)
• Scissors
• Ropes long enough to reach over the frame.
• Hammers and gloves
• Metal file
• Duct tape
• Box cutter or utility knife
• Ladders, work platforms, and other machinery for lifting
designed to work safely at the height of the frame
UNPACK AND IDENTIFY PARTS
The following steps will ensure that you have all the
necessary parts before you begin to assemble the shelter
frame.
1. Unpack the contents of the shipment and place where
you can easily inventory the parts. Refer to the Bill of
Materials/Spec Sheets.
2. Verify that all parts listed on the Bill of Materials/Spec
Sheets are present. If anything is missing or you have
questions, consult the Pictorial Parts Guide and all
diagrams for clarification, or contact Customer Service.
NOTE: At this time, you do not need to open the plastic
bags containing smaller parts such as fasteners or
washers (if equipped).

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
ANTI-BILLOW ROPE INSTALLATION
TO PREVENT DAMAGE AND POSSIBLE INJURY,
INSTALL THE ANTI-BILLOW ROPES IN SHORT
LENGTHS ALONG EACH SIDE OF THE FRAME.
DO NOT INSTALL AS A SINGLE LENGTH TIED AT
EACH END OF THE BUILDING. DOING SO WILL
RESULT IN A LOOSE SIDE PANEL IF THE SINGLE
ROPE BREAKS DURING STRONG WINDS.
ROPE
#1
NOTE: The circles identify
the ends of ROPE #1.
ROPE
#2
IMPORTANT: IF RIBBON BOARDS ARE USED,
PURCHASE WOOD SCREWS TO ATTACH THE
U-CHANNEL TO THE INSTALLED RIBBON BOARD.
TEK SCREWS ARE NOT WOOD FASTENERS. NEVER
USE TEK SCREWS TO SECURE ANY COMPONENT
TO WOOD. THEY WILL NOT HOLD.
Ribbon Board
Baseboard
Actual frame may di󰀨er from example shown.
CUSTOMER-SUPPLIED MATERIALS — Baseboard, Ribbon Boards, & Wood Screws
Baseboards and ribbon boards are optional, but recommended, for buildings with roll-up sides. Materials for baseboards
and ribbon boards are not included and are supplied by customer.
ATTENTION: Fasteners to secure boards to
building frame are included. Recommended lumber
dimensions shown; wider boards can be used if
desired. Counter sink holes for 1/4" carriage bolts if
bolt length is too short for board thickness.
BASEBOARDS
The baseboard, when installed properly, helps prevent the
ground posts from sinking into the ground when anchored.
Depending on the building, it also provides a surface to
attach struts or other building components.
ATTENTION: Baseboards run the frame length along both
sides at ground level. Installation of customer-supplied
baseboard is described later in this guide.
RIBBON BOARDS
A ribbon board typically runs a few feet above the ground
along the sidewall. It serves as a mounting surface for the
u-channel that secures the main cover and roll-up portion of
the main cover.
MATERIAL DIMENSIONS
• Baseboards: 2" x 6" (minimum)
• Ribbon Boards: 2" x 4" or 2" x 6" (recommended)

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
The following graphics and photos will help you identify
the different parts and show you how they are used.
(Some parts are not shown.)
CC6212 &
CC6213
Fabric Clips
FA4482B
Tek Screw
102856
End Clamp
102548
Cross Connector
Swaged
Plain
Swaged and Plain Rafter Sections
102569
Bearing
102717
Gearbox Drive
102198
U-Channel Spring
102197
Poly Latch U-Channel
102570
Aluminum Channel
Zippered End Panel
102675
Ground Post
FRAME ASSEMBLY NOTE
During the assembly of the frame, install a Tek screw
through each clamp into the rafter and through each clamp
into the purlin.
Position all Tek screws so they will not touch the cover
material once it is installed.
Rafter Joint
Purlin
Tek Screw
Tek Screw
Rafter
103544
Mounting Plate
103496
Gear Box
117063 EZ-Snap
Rope Hooks

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
End Rafter
Inside
Rafter
Purlins
Baseboard is
supplied by
customer.
Ground
Level
ATTENTION: Position purlins evenly during the
frame assembly. Use the rafter pipe joints as
guides when installing the end clamps, cross
connectors, and purlins.
Round Premium High Tunnels
OVERVIEW
This section is an overview of the process for assembling
your high tunnel. For details, please see section,
Assembling the High Tunnel Components. See illustration
below to identify main parts of high tunnel.
1. Locate the required parts for each assembly procedure.
2. Assemble the rafters and frame, and square the frame.
3. Prepare and attach end panels.
4. Attach main cover and Twist-of-the-Wrist assembly.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
LAY OUT THE BUILDING SITE
After the site is prepared, lay out the building site.
Taking these steps before assembling the shelter saves
time and ensures that the structure is positioned as
desired.
Ground posts must be driven to the proper depth. Width
of the shelter is measured from the center of one
ground post to the center of the remaining ground post.
SQUARE THE SITE
Gather the parts:
• Ground posts
• 5/16" x 2-1/2" machine bolts
• 5/16" nuts
1. Identify a corner where a ground post will be positioned
and drive the first ground post into the ground.
NOTE: Insert the ground post driver into the top of
the ground post to protect the post and drive the post
into the ground. The top of the post will be one (1) foot
above the finished grade when properly driven.
4. String a line at least as long as the building from the
first stake at 90°.
NOTE: A transit can be used to ensure an accurate 90°
angle, or the 3-4-5 rule can be used. Refer to diagram.
Using multiples of 3-4-5 such as 6-8-10 or 12-16-20
helps to maintain an accurate 90° angle.
5. After squaring the position of the building, measure the
length and drive the next corner ground post.
6. Repeat the same step for the last corner post.
NOTE: The distance measured diagonally between
corner posts must be equal for the building to be
square.
7. Check all dimensions (and adjust if needed) before
driving the remaining posts to the required height.
8. After all corner posts are accurately installed, tie a
string line between the tops of the corner ground posts
on the same side of the shelter. The string is used to
identify the tops of all remaining ground posts. The
string must remain tight and level.
9. Use a tape measure to mark the 48" on-center
locations of the remaining ground posts.
10. Drive the remaining ground posts into the ground at the
required 48" on-center width and the height identified
by the string.
NOTE: Verify that the holes in the ground posts are in
the proper position and that each post is plumb and
driven to the correct depth.
After the rafters have been assembled, the rafter ends
are secured to the ground post using the upper hole.
The bottom two (2) holes on the ground post are used
for the optional baseboards.
11. Continue with the Rafter Assembly steps that follow.
ATTENTION: Position the pre-drilled holes facing to the
inside/outside of the shelter so they can be aligned with
the bolt holes in the rafter legs.
To align the bolt holes in the ground posts with those
in the rafter after driving the ground posts, insert a
tapered rod or pry bar into a ground post bolt hole and
turn the post using the rod or pry bar.
2. After the first corner ground post is in place, string a
line the width of the building (center-to-center) and
drive the second ground post into the ground just
enough to hold it in place.
3. Use a transit or line level to drive the second corner
post to the same depth as the first ground post.
Outside of
Shelter
Inside of
Shelter
Ground
Post

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
ASSEMBLING THE HIGH TUNNEL FRAME
COMPONENTS
NOTE: Assistance is required to assemble the high tunnel
frame.
RAFTER ASSEMBLY
Gather the parts:
• Rafter pipe #20R1601
• Rafter pipe #20R1602
• Rafter pipe #166S027D
• End clamps
• Tek screws
• Nut setter (3/8'' x 2-9/16 magnetic)
Rafter Assembly Procedure
Each rafter assembly consists of six (6) rafter sections:
three (3) swaged sections, one (1) non-swaged (plain)
section, and a pair of swaged extensions.
1. Select the six (6) pipes needed to assemble a rafter
and arrange these on a flat surface as shown below for
assembly.
2. Slide the swaged portion of each rafter pipe into the
plain end of the pipe as shown.
3. With the main rafter pipes seated at each joint and the
rafter positioned on a flat surface, secure each joint
with a single self-tapping Tek screw.
ATTENTION: Do not secure the drilled leg pipes until
rafter is secured to the ground posts. This allows holes
in rafter legs to be aligned with those in ground post.
Install the screws so they will not touch the cover once
it is installed. This is typically on the backside of the
rafter, which will be the surface visible from the inside
of the high tunnel once the frame is assembled.
4. Assemble rafters as described and continue with the
additional steps to complete the assembly of the two
(2) end rafters.
END RAFTER ASSEMBLY
In addition to the steps in the previous procedure, complete
the following steps for the two (2) end rafters only.
1. Take one of the assembled rafters and place it on a flat
surface.
2. Slide three (3) end clamps onto the rafter in the
locations noted below. (Do not secure the clamps to the
rafter at this time. These clamps will be repositioned
during the frame assembly when the purlins are
added.)
NOTE: Position all clamps as shown. Use a piece of
duct tape (if desired) to keep each clamp from sliding
when the rafter is lifted into position.
View of the end rafter and clamps as shown from the
outside when the frame is assembled.
3. Repeat the same procedure for the final end rafter.
4. Continue with the Frame Assembly instructions that
follow.
(#20R1601)
(#20R1602)
(#166S027D)
1˝
Tek screw

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
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 assembly 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.
3. Place an interior rafter assembly into a second set of
ground posts. Secure the leg pipes to the ground posts
as previously described.
4. Position two (2) cross connectors near the top of the
interior rafter assembly as shown below.
5. Take two (2) swaged 75" purlin sections and insert
each through an upper clamp on the end rafter and
through the cross connectors near the top of the interior
(or second) rafter as shown above.
6. Verify that both rafters are plumb and properly spaced
(4' on center).
7. Tighten the upper cross connectors on the interior
rafter and tighten the end clamps near the top of the
end rafter to secure the first purlin pipes.
NOTE: Do not allow the purlin to extend beyond the
end of the end rafter. See diagram below.
8. Continue adding rafters and purlin pipe until the frame
is assembled. Secure all purlin splices using Tek
screws. See Step 10.
NOTE: Each purlin assembly consists of 1.315'' x 75''
(#131S075) swaged pipes (number is determined by
shelter length) and one (1) 1.315'' x 73.5'' (#131P0735)
plain pipe.
9. Finish each purlin run using the plain, shorter pipe
(#131P0735), and use the final end rafter to complete
the assembly.
NOTE: If the last end rafter is plumb and the purlin
run extends beyond the end of the rafter, cut the last
section of purlin pipe to the required length. Typically
purlin pipes do not require cutting. Verify that you have
the correct plain pipes before you decide to cut any
pipe to complete the purlin runs.
CAUTION: To prevent cover damage, the ends of the
purlins should extend no more than ½'' past the end
clamp. Position the bolt side of the end clamps toward
the “inside'' of the shelter (the same side as the purlin).
To the
inside of
the shelter
1/2''
10. Once all rafters are set and all purlins are in place and
secured, return to each pipe splice of each purlin run
and install a Tek screw through the pipes to secure the
joints if this was not completed during assembly.
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.
4'
center-to-center
interior rafter
11. Return to each rafter and, using Tek screws, secure
the joint between the lower rafter legs (drilled pipe) and
the upper rafter pipes and continue with the following
procedure.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
FINISH ROUGH EDGES
Gather the parts:
• Duct tape (supplied by customer)
• Metal file
1. Check for any sharp edges on the frame and file them
smooth so they will not cut the cover.
2. Apply two layers of heavy duct tape on all pipe
connections and clamps that may contact the cover.
ANCHOR THE ASSEMBLED FRAME
At this point, anchor the high tunnel frame. Consult the
MUST READ document for anchoring information and
suggestions. Please call customer service at 1-800-245-
9881 for additional anchoring information.
CAUTION: The anchor assembly is an integral part of
the high tunnel construction. Improper anchoring may
cause instability and failure of the structure to perform
as designed. Failing to anchor the shelter properly
will void the manufacturer’s warranty and may cause
serious injury and damage.
BASEBOARD INSTALLATION (RECOMMENDED)
Gather the parts:
• Treated or recycled plastic lumber (supplied by
customer). Recommended: 2" x 6".
• 1/4" x 4" carriage bolts and nuts (may not work for
baseboards with a thickness greater than 1-1/2")
NOTE: The following procedure describes one way
to install the recommended baseboards. The size
and type of the baseboard you choose may require
the use of alternative steps. When properly installed,
baseboards run the length of the frame.
On the outside of the frame, attach the first baseboard
to the ground posts using the 1/4" x 4" carriage bolts
(FAH009B) and nuts (FALB01B). Continue adding
baseboards to complete the first run. Splices are
made between posts as shown. Use a short section of
baseboard to secure separate baseboards at a splice.
Ground
Level
Inside of
Shelter
Outside of
Shelter
NOTE: The boards should be at ground level or slightly
into grade to prevent the shelter from sinking and to
create a seal along the bottom. After installing the
baseboards, continue with these instructions.
This baseboard is not included with the shipment and must
be supplied by the customer. Treated or recycled plastic
lumber works well for a baseboard.
Recommended dimension: 2" x 6".

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
ATTACH END PANELS
CAUTION: To prevent damage, do not install end
panels on a windy day.
Gather the parts:
• End panels 3-Zip (zippered)
• Fabric clips #CC6213 (Divide quantity in half.)
• Tape measure
• Scissors
Assembly Procedure
1. Spread an end panel out on the ground at the desired
end of the frame and center the end panel as needed.
2. With the proper lift (or ladders) positioned inside the
frame, pull the end panel up and over the top of the
end rafter.
3. Secure the end panel to the backside of the end rafter
at the top, center position using a fabric clip and Tek
screw.
4. Moving outward in both directions, continue attaching
fabric clips to secure the end panel to the rafter. Evenly
space the fabric clips and work toward the ground.
5. Verify that the end panel is in the desired position and
repeat the steps to secure the other end panel to the
frame using the remaining half of the fabric clips.
NOTE: The end panels may be shipped as untrimmed
rectangular pieces. If so, use scissors to trim the
excess end panel material from inside the frame after
attaching the panels to the end rafters.
4'-5'
Ribbon Board
Rafter
Shelter shown above may be a different model.
Drawing used for illustration only.
MAIN COVER INSTALLATION
After the end panels are installed, install the main cover.
The steps to install the main cover include:
1. Attach poly latch U-Channel (102197) along the high
tunnel sides and tops of the high tunnel end rafters
using FA4482B Tek screws.
2. Pull main cover over the frame.
3. Attach the main cover to the end rafters using the poly
latch springs.
4. Stretch and attach main cover to the sides of the frame.
5. Install roll-up side kits and test the operation of the
twist-of-the-wrist assembly.
INSTALL POLY LATCH U-CHANNEL (102197)
1. Measure the desired height (4'-5') to identify the top
of the roll-up sides. Attach the poly latch channel at
approximately 4'-5' above the ground on both sides of
the frame.
RECOMMENDED: Attach a ribbon board (2" x 4"
or 2" x 6") to the rafters and then attach the poly
latch U-channel (102197) to the ribbon board using
customer-supplied wood screws.
NOTE: Ribbon board and baseboard (recommended)
shown in the diagram above are not included and are
supplied by the customer. Use the supplied FAH009B
(1/4" x 4") carriage bolts and FALB01B (1/4") nuts to
secure the ribbon board and U-Channel to the rafter.
Use customer-supplied wood screws to secure
U-channel to ribbon board. Do not use Tek screws
to attach U-Channel to wood.
NO RIBBON BOARD: Attach one section of the poly
latch U-Channel to the side of the frame using Tek
screws. Attach U-Channel ush with the outside edge
of the end rafter at each end of the assembled frame.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
U-Channel
End Rafter
INSTALL POLY LATCH U-CHANNEL (Continued)
3. Repeat these steps for the remaining side.
4. After attaching the poly latch U-Channel to the sides of
the frame, use Tek screws to attach the U-Channel to
the top of one end rafter. Space screws at 24".
ATTENTION: The poly latch U-Channel will bend with
the curve of the rafter as it is attached. The U-Channel
runs from the poly latch U-Channel attached to one
side of the frame to the U-Channel attached to the
other side of the frame.
5. Repeat the steps to attach the U-Channel to the top
of the remaining end rafter and continue with the next
procedure.
2. Continue to attach the U-Channel sections to the
rafters (or ribbon board if used) and work toward the
other end of the frame. Cut the last section of
U-Channel to the required length so that it is flush with
the outside edge of the end rafter.
NOTE: Inset shows the use of a ribbon board.
U-channel can be attached directly to rafters using
FA4482B Tek screws when ribbon board is not used.
Ribbon Board
FAH009B bolt installed
through U-channel,
board and rafter.
Space below is reserved for customer notes.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
If you do not want corner baffles installed, skip this section and continue with the next page. Corner baffles for roll-up
sides can be installed later; however, it is easier to install before installing cover, roll-up panels, and anti-billow ropes.
Complete these steps to install a baffle at each corner of the assembled frame.
1. Locate four (4) pieces of 102197 single u-channel, additional 102198A spring wire, and the 108654 roll of 6 mil film.
2. At one corner, cut and attach the 102197 u-channel to the end rafter and first interior rafter as shown. Install these
horizontal runs of single u-channel above the baseboards and below the single u-channel.
REQUIRED PARTS:
• 102197 U-channel
• 102198A Poly-Coated Spring Wire
• 108654 6' Wide 6 MIL Film
• FA4482B Tek Screws
Step 2
Step 2: Attach u-channel
to rafters at each end.
102197
Step 2
102197
INSTALL CORNER BAFFLES
Corner
Baffle
Corner
Baffle

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
3. Measure the distance between the upper and lower single u-channel installed in Step 2. Cut two additional
u-channel sections to this length and attach these vertical runs to the end rafter and interior rafter. Space Tek
screws (FA4482B) approximately 12" on-center. Vertical channel runs may consist of multiple small lengths
of available u-channel.
INSTALL CORNER BAFFLES (continued)
4. Take the 108654 roll of 6 mil film and cut a piece to cover the end bay opening framed by the single u-channel.
Roll out the film and measure length to determine the best way to cut the film. You need four (4) identical panels
from the film roll.
5. With assistance, secure the film panel in the u-channel using the 102198A wire spring.
Measure between the
u-channel sections.
6. Trim the film as needed and repeat the steps to install all remaining corner baffles.
7. After installing all baffles, continue with the next procedure.
108654 film
cut from roll.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
INSTALL MAIN COVER
Gather the parts:
• Main cover
• Ropes long enough to reach over the frame (provided
by customer)
• U-Channel spring
• Box cutter or utility knife
Assembly Procedure
After the poly latch U-Channel is attached to the frame,
unpack the main cover and pull into place. Ropes or straps
are typically used to pull the main cover onto and over the
frame.
WARNING: To prevent damage to the cover and to
prevent serious personal injury, DO NOT attempt to
install the main cover on windy or stormy days.
1. Unpack the main cover and position it at the base along
one side of the frame.
2. Make small holes along the edge of the cover at evenly
spaced intervals and tie rope to the cover. (The length
of the cover determines the number of holes that are
needed to attach the ropes.)
NOTE: The ropes must be long enough to reach over
the top of the building to the other side. Long buildings
will require additional ropes to prevent tearing the main
cover when it is pulled into place.
3. After tying the ropes to the main cover, throw the ropes
over the top of the frame and pull the cover into place.
Cover must be centered side-to-side and end-to-end.
IMPORTANT: To prevent damage to the main cover
during installation, additional personnel and lifts may be
needed.
Shelter shown above may be a different length than
actual shelter.
4. Once the main cover is in place and centered on the
frame, begin at the peak of one end rafter and install
the wire spring into the U-Channel to secure the cover.
ATTENTION: Center the main cover front to back and
side-to-side to ensure that enough cover material is
present to lock into the U-Channel. The excess cover
along each side is rolled up when the roll-up side
assemblies are installed.
The rope can remain in place to temporarily secure
the cover if needed. Remove the ropes as the cover is
secured to the frame.
Photos show installing the spring into the U-Channel on
the outside of a frame. The process is the same for the
U-Channel attached to the top of the end rafters.
5. Continue adding the spring into the U-Channel at the
top of the first end rafter. Ensure that an even amount
of the cover is exposed and maintained along the edge
of the frame as it is attached.
NOTE: The cover material is cut longer/wider than is
required to cover the frame. For easier anchoring, allow
approximately 10" to extend past the edge of the end
rafter as the cover is anchored in place.
6. Continue down both edges of the first end rafter
until the entire length of the end of the main cover is
secured in place.
7. Stretch the cover to the other end of the building and
repeat the steps to secure the main cover in the U-
Channel.
NOTE: Pull the cover tight as the spring is inserted into
the U-Channel.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
8. After the cover is stretched end-to-end and secured
using the spring and U-Channel, move to one side
of the frame and repeat the steps to anchor the main
cover to the first side.
Begin at one end of the U-Channel and work toward
the other. It is also possible to begin at the middle of
each side and work toward each end.
NOTE: Maintain an even length along the side. The
final stretching of the cover takes place when the last
side is secured.
9. After securing the first side, move to the remaining side
and secure it in place.
IMPORTANT: DO NOT REMOVE TOO MUCH OF THE
EXCESS COVER MATERIAL AT EACH END. Some
excess main cover material–the material that extends
beyond the end rafters–should remain in place. If the
main cover needs stretched in the future, remove the
spring from the U-Channel, grasp the excess material,
pull the cover tight, and reinstall the spring.
The excess material along the sides is rolled up in the
roll-up side assembly.
10. Once the main cover is installed and secured in the
U-Channel, continue with the Install the Roll-up Side
Assemblies procedure.
Roll-up Portion
of the Cover
Space below is reserved for customer notes.
INSTALL MAIN COVER (continued)

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
INSTALL THE ROLL-UP SIDE CONDUIT
Gather the parts:
• Pipe 1.315'' x 75'' Swaged 17 GA (#131S075)
• Pipe 1.315'' x 73.5'' Plain 17 GA (#131P0735)
• Tek screws
The roll-up side conduit assembly is attached to the bottom
of the roll-up side cover material. This assembly runs the
length of the frame and serves as the center pipe that the
roll-up cover wraps around when it is opened to ventilate
the shelter. This conduit is identical to the purlins that were
assembled and attached to the frame.
Complete these steps to assemble the roll-up side conduit.
1. Locate all sections of pipe needed to assemble the
cover conduit.
2. Insert the swaged end of each pipe into the plain end of
another pipe until the conduit is assembled.
3. Secure each pipe joint with a Tek screw.
INSTALL THE ROLL-UP SIDE ASSEMBLIES
The instructions below describe how to install a single
roll-up sidewall assembly for one side of the frame. The
procedure is repeated for the remaining side.
The procedures to install the roll-up side include the
following:
1. Assemble the roll-up side conduit.
2. Attach the roll-up conduit to the bottom of the main
cover.
3. Assemble the Twist-of-the-Wrist assembly and attach it
to the frame and the roll-up side.
4. Install the Anti-Billow Rope system.
5. Test the operation of the roll-up side.
4. Place the assembled conduit at the base of the side
where the end of the main cover is located.
NOTE: Duct tape Tek screws to prevent damage to
main cover.
5. Continue with the procedure that follows to attach the
conduit to the main cover.
ATTACH CONDUIT TO MAIN COVER ROLL-UP SIDE
Gather the parts:
• Assembled conduits
• Fabric clips #CC6212 (Divide quantity in half.)
• Tek screws
To this point, the main cover should be secured to the
frame and the excess cover along both sides should be
hanging down along the side of the frame.
1. Unfold the remaining portion of the main cover (if
needed) and evenly stretch it out on the ground along
the frame.
2. Roll the assembled cover conduit onto the edge of the
main cover. Allow conduit to extend beyond the rafter
at the end where you plan to install the gearbox for
operation.
3. Secure the cover material to the conduit with Tek
screws and fabric clips evenly spaced along the
conduit.
4. Continue to roll the conduit until the excess cover
material is wound around the conduit.
5. With the excess cover material rolled up on the conduit
assembly, continue with the Twist-of-the-Wrist
Assembly procedure.
Inside View
Shelter shown above may be a different model.
Drawing used for illustration only.

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GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
TWIST-OF-THE-WRIST ASSEMBLY
Gather the parts:
• Aluminum channel
• Drive handle
• Gearbox and gearbox drive
• Mounting plate
• Bearing and threaded rod
• 1/4" X 2" Carriage bolts and 1/4" nut
• 3/8" nuts and washers
The Twist-of-the-Wrist Assembly is designed to roll up a
portion of the sides of the structure. The following steps
describe the assembly and its installation.
1. Drill a 5/16" hole through the cover conduit 1/2" from
the end of the conduit.
2. Insert a tubing adapter into the conduit and align
the holes of the adapter with the drilled holes in the
conduit.
3. Select the aluminum channel and drill a 3/8" hole
through the channel approximately 2" from the end and
attach a threaded rod using a 3/8" nut on each side of
the channel.
5/16" Nut
5/16" Nut
Flat Washer
Nut
2"
4. Position the channel along the end rafter at the end of
the building where the Twist-of-the-Wrist assembly will
be located.
NOTE: Verify that the lower end of the channel is
slightly off the ground to allow it to move freely when
the panel is rolled up and down.
5. Secure the upper end of the channel by drilling a 3/8"
hole through the end rafter and attach as shown. The
lower end of the channel will "float" and is not attached.
NOTE: Install a flat washer between the nut and the
end panel. Panel is not shown in the insert.
6. Select the bearing bracket and attach the bearings as
needed. (In some instances, the bearings may come
already attached.) Assemble as follows:
Single bearings are attached to the sides of the bracket
and double bearings to the middle portion of the
bracket. Use 1/4" hex bolts and locknuts as needed.
Install a flat washer on both sides of each bearing to
insure proper operation of bearings and the assembly.
Install the longer bolts with bearings on the side of the
bracket that has the two holes. Install these before
installing the double bearing assembles. See the
figures below.
7. For the spacers on the long bolts, insert a 5/16" nut
over each bolt. These nuts are used as spacers only.

19
GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
8. Slide the Twist-of-the-Wrist mounting plate over the
long bolts and secure the plate with two lock nuts
9. Attach the Twist-of-the-Wrist gearbox to the mounting
plate using hex head bolts.
10. Using a 1/4" x 2" bolt (FAG308B) and nut (FALB01B),
attach the square shaft to a tubing adapter.
11. Slide the square shaft through the Twist-of-the-Wrist
gearbox.
TWIST-OF-THE-WRIST ASSEMBLY (Continued)
Lock Nuts
12. Slide the Twist-of-the-Wrist assembly onto the
aluminum channel from the ground end. (This is the
free end of the channel.)
13. Roll the cover conduit up to the Twist-of-the-Wrist
assembly.
14. Attach the conduit to the square shaft of the assembly
by inserting a 1/4" bolt through the hole in the conduit
and tubing adapter. Add and tighten the 1/4" nuts.
15. Attach the crank handle to the Twist-of-the-Wrist
assembly. (Cover is not shown in the above diagram.)
16. Test the operation of the Twist-of-the-Wrist assembly.
NOTE: If the cover rolls in the desired direction, but
you want to turn the crank in the opposite direction for
the same result, unbolt, reposition the gearbox, and
remount it on the same side of the mounting bracket.
Bolt shown in
diagrams may differ
from actual bolt.

20
GROWSPAN™ROUND PREMIUM HIGH TUNNELS
Revision date: 10.25.21
ROPE
#1
ROPE
#2
A
B
C
D
ANTI-BILLOW ROPE INSTALLATION
TO PREVENT DAMAGE AND POSSIBLE INJURY, INSTALL ANTI-BILLOW ROPES IN SHORT LENGTHS
ALONG EACH SIDE. DO NOT INSTALL AS A SINGLE LENGTH TIED AT EACH END. DOING SO WILL RESULT
IN A LOOSE SIDE PANEL IF SINGLE ROPE BREAKS. CONSULT THE SIDE PROFILE DIAGRAM FOR YOUR
FRAME LENGTH IN THE QUICK START SECTION FOR ROPE PATTERN AND ROPE HOOK LOCATIONS.
Follow these general steps to attach the 117063 rope hooks, FA2061
eyebolts, and install the anti-billow ropes:
1. Determine the location of rope hooks, eyebolts, and the number of
anti-billow ropes for each side using the Side Profile diagram in the
Quick Start section for your frame length.
2. Attach the 117063 rope hooks using wood screws for wood and Tek
screws for metal. Be sure to note where one rope stops and the next
rope begins.
3. Take the CC5525 (1/4") rope and install it in short lengths along each
side. Pull tight to keep panels in place.
4. Test the operation of the roll-up side.
5. Repeat to install the anti-billow rope for the remaining side once the
panel is installed.
6. With all anti-billow ropes installed, continue with the next page.
INSTALL ANTI-BILLOW ROPES
C
D
A B
NOTE: In those
instances when
two ropes
terminate at the
baseboard or
lower position (D),
install the rope
snaps and rope
as shown in these
photos.
Photos show
using optonal
hat channel for
baseboards.