GrowSpan PB01750R6 User manual

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Revision date: 11.29.21
GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
Photo may show a different but similar model.
STK# DIMENSIONS
PB01750R6 42' W x 15' H x 48' L
©2021 GrowSpan™
All Rights Reserved. Reproduction
is prohibited without permission.
GrowSpan™ Round Premium
Extra Tall High Tunnel Buildings

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
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.
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.

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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 and driver (cordless with
extra batteries works best)
• Wrench, ratchet and socket (recommended)
• Scissors and metal file.
• Ropes long enough to reach over the frame.
• Hammers and gloves
• Duct tape (supplied by customer)
• 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 EXTRA TALL HIGH TUNNELS
ROPE
#1
ROPE
#2
NOTE: The circles identify
the ends of ROPE #1.
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.
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 frame
are included. Recommended lumber dimensions
shown; wider boards can be used if desired.
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. CUSTOMER SUPPLIES FASTENERS
TO SECURE RIBBON BOARD TO RAFTERS. QUARTER
(1/4") CARRIAGE BOLTS ARE RECOMMENDED.
LENGTH DETERMINED BY BOARD THICKNESS.
MATERIAL DIMENSIONS
• Baseboards: 2" x 6" (minimum)
• Ribbon Boards: 2" x 4" or 2" x 6" (recommended)

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
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 &
CC6214
Fabric Clips
FA4482B
Tek Screw
102857
End Clamp
102547
Cross Connector
Swaged
Plain
Swaged and Plain Rafter Sections
(some pieces are not shown)
102569
Bearing
102717
Gearbox Drive
102570
Aluminum Channel
Zippered End Panel
102676
Ground Post
104211
Double U-Channel
102197
Poly Latch U-Channel
QH1404
Band Clamp
10016108
Combo Tee
Coupler
103544
Mounting Plate
103496
Gear Box
102198
U-Channel Spring
117063 EZ-Snap
Rope Hooks

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
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.
Ground Post
OVERVIEW
This section describes assembling your high tunnel. For
additional details, 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.
3. Prepare and attach end panels.
4. Attach main cover and Twist-of-the-Wrist assembly.
Round Premium Extra Tall
High Tunnel

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
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 72" on-center
locations of the remaining ground posts.
10. Drive the remaining ground posts into the ground at the
required 72" 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.
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 EXTRA TALL HIGH TUNNELS
11. Using the remaining ground posts, drive the center
ground posts in the same manner as the side ground
posts. Verify on-center dimensions.
LAY OUT THE BUILDING SITE (CONTINUED)
NOTE: Ground post layout shown above may differ
from your shelter. Diagram used for illustration
purposes only.
12. Verify that the on-center width of the frame is uniform
between the corner ground posts.
6' on-center
21' on-center 21' on-center
6' on-center
NOTE: The frame is square when the two diagonal
measurements are the same.
After the rafters have been assembled, the rafter ends
are secured to the ground post using the upper hole.
The second and third holes on the ground post are
used for the baseboard along the building base.
13. Continue with the Rafter Assembly steps that follow.
Space below is reserved for customer notes.

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
ASSEMBLING THE ROUND STYLE STORAGE MASTER
FRAME COMPONENTS
NOTE: Assistance is required to assemble the frame.
INTERIOR RAFTER ASSEMBLY
This section is an overview of the process for assembling
your interior rafters. The illustration below identifies main
parts of the assembly.
1. Locate the required cross connectors, couplers, band
clamps and pipes: six (6) curved rafter pipes and two
(2) leg pipes with drilled ends.
2. Assemble seven (7) interior rafter assemblies as shown
below.
NOTE: Band clamps (#QH1404) are only attached to
two (2) interior rafter assemblies.
Use a piece of duct tape (if desired) to keep each
clamp from sliding when the rafter is lifted into position.
3. With the rafter pipes seated at each joint and the rafter
positioned on a flat surface, secure each joint with
a single self-tapping Tek screw. Position Tek screw
approximately 1" from pipe joint.
ATTENTION: 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 shelter once the frame is
assembled.
42R1903
42R1901D
42R1902
42R1902
42R1902
42R1902
42R1902
42R1901D
Tek Screw
Combo Tee Coupler
(#10016108)

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
END RAFTER ASSEMBLY
Complete the following steps for the two (2) end rafters
only.
1. Select the required couplers, clamps and pipes needed
to assemble an end rafter. Arrange these on a flat
surface and assemble rafter as shown below.
2. Position all clamps as shown. (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: 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. With the 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: 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. Repeat the same procedure for the final end rafter.
5. Continue with the Frame Assembly instructions that
follow.
Tek Screw
Band Clamp
(#QH1404)
Tek Screw
Band Clamp
(#QH1404)
NOTE: Band clamps are used
to secure the diagonal struts.
42R1903
42R1901D
42R1902
42R1902
42R1902
42R1902
42R1902
42R1901D
Tek Screw
Combo Tee Coupler
(#10016108)

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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 five (5) 1.90" x 99" (#190S099)
swaged pipes and one (1) 1.90" x 96" (#190P096) plain
pipe.
The remaining purlins consists of seven (7) 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)
• Struts - 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.

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
Inside of
Shelter
Outside of
Shelter
Rafter
Ground
Post
3. Secure the leg pipes to the ground posts top hole using
5/16" x 2-1/2" machine bolts and nuts as shown below.
FRAME ASSEMBLY (CONTINUED)
4. Assemble the center support by inserting the swaged
end of one 99" pipe into the non-drilled end of the 82"
pipe and secure the joint with a Tek screw.
5. Once the support is assembled, place the drilled end
over the first center ground post and slide the upper
end into the combo socket fitting at the top of the end
rafter.
NOTE: It may be necessary to align the socket fitting
with the center support during these steps.
6. With the upper end of the support in the socket fitting,
align the drilled holes in the center support with the
holes in the ground post and secure using the 5/16"
bolts (FAG336B) and nuts (FALB02B).
7. Once the support is anchored to the ground post,
secure it to the socket fitting at the top of the rafter
using an Allen wrench and the set screw.
DO NOT SECURE THE SOCKET FITTING TO THE
RAFTER AT THIS TIME.
End Rafter
1.90" Purlin
Center Support
ATTENTION: Do not allow the center support pipe
to extend into the opening that remains for the upper
purlin.
8. Place the first interior rafter assembly (with QH1404
band clamps) into a second set of ground posts.
Secure the leg pipes to the ground posts as previously
described.
9. Assemble another center support and secure the
support to the first interior rafter.
10. Position two (2) cross connectors near the top of the
interior rafter assembly.
11. Take two (2) swaged 75" purlin sections and insert
each through each end clamp on the end rafter and
through the cross connectors on the interior (or second)
rafter.
12. Insert one (1) swaged 99" purlin into the coupler at the
top of the end rafter and through the coupler on the
second rafter as shown.
Correct Incorrect
13. Verify that both rafters are plumb and properly spaced
(6' on center).
6'
on-center
131S075
190S099
131S075

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FRAME ASSEMBLY (CONTINUED)
14. Tighten the cross connectors and end clamps on the
rafters to secure the first purlin pipes.
15. Continued adding rafters, center supports and purlins
until the frame is assembled.
16. Finish each upper purlin run using the plain, shorter
1.315" pipe (#131P0735) and the center purlin with the
shorter 1.90" plain pipe (#190P096).
NOTE: Use the last interior rafter with band clamps for
the second to last rafter. The band clamps are used to
secure the diagonal struts.
If the last end rafter is plumb and the purlin runs
extends beyond the end of the rafter, cut the last
section of purlin pipes 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 not extend past the end clamp. The bolt
side of the end clamps must go toward the “inside''
of the shelter (the same side as the purlin) as shown
below.
17. 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.
18. With all rafters and center supports in place, take one
end panel and spread it out on a clean, flat surface with
the center pocket facing up.
NOTE: Position the panel at the end of the frame
where you want to install it.
19. Remove the attached center support from the end
rafter. Tape over the screw and joint with duct tape to
protect the end panel.
99'' Swaged
(#190S099)
75'' Swaged
(#131S075)
6'
on-center
75'' Swaged
(#131S075)
Band Clamp
(#QH1404)
Band Clamp
(#QH1404)
NOTE: Struts are installed later in the instructions.
Inside of
Shelter
Outside of
Shelter
Rafter
Ground
Post
The center support on
the end rafters may be
assembled and attached
when installing the end
panels. Ground Level

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Strut must be
attached above
dash line for
proper installation
of baseboards.
FRAME ASSEMBLY (CONTINUED) Strut Assembly Procedure
1. After the rafter assembly is complete, verify that the
band clamps are in the proper location. See diagram
below. Add clamps if needed.
2. Remove the bolts and attach a strut between the
band clamp on the purlin and the band clamp on the
end rafter. The lower band clamp and strut must be
attached as shown below.
NOTE: Verify that the bolt heads are to the outside of
the shelter and that the end rafter is plumb before
tightening the nuts.
3. Install the remaining struts and tighten all band clamp
bolts.
4. Secure each band clamp to each purlin or rafter with a
Tek screw.
5. Check each purlin joint and secure using a Tek screw if
this has not been done.
20. Slide the center support into the center pocket of the
end panel. Be sure to position the drilled holes in the
center support toward the bottom so the support can be
reattached to the ground post.
21. Lift the end panel with the center support inserted into
the pocket and reattach the support to the end center
ground post.
ATTENTION: The end panel will hang on the center
support until it is pulled up and over the end rafter in a
later procedure. DO NOT secure the end panel to the
end rafter at this time. The main cover must be installed
before the end panels are attached.
22. Repeat the steps 18-21 to install the remaining end
panel.
At this point, all center supports should be installed and
secured. The two end panels will be hanging from the
center support at each end of the frame.
23. Continue with installing the struts.
Center Support
Pocket

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Space below is reserved for customer notes.
BASEBOARD INSTALLATION (RECOMMENDED)
Gather the parts
• Treated or recycled plastic lumber (supplied by
customer). RECOMMENDED: 2" X 6".
• 5/16" x 3" Lag Bolts (FAJ117B)
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 5/16" x 3" lag bolts. Insert
the lag bolts, from the inside of the shelter, through the
ground posts into the baseboards. Continue adding
baseboards to complete the first run. Splices are made
between posts. Use a short section of baseboard to
secure separate baseboards at a splice.
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.
Inside of
Shelter
Outside of
Shelter
Ground Level
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".
LENGTH DETERMINED BY CUSTOMER/CONTRACTOR.

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CABLE ASSEMBLY
Cable assemblies provide diagonal bracing for the building.
Each cable assembly includes the following items:
• Cable
• Turnbuckle (1)
• Cable thimbles (2)
• Cable clamps (4)
Cable Assembly Procedure
1. Cut the cable to the proper length for each assembly. More than an adequate amount has been sent for the cabling
application. Use diagram on the following page for location of the cable and measure the length needed.
2. Insert one cable thimble through one end of the
turnbuckle as shown in the first figure to the right.
3. Place the cable thimble approximately twelve inches
(12") from the end of a cable section and wrap the
cable around the thimble as shown in the second figure
to the right.
4. Grasp both sections of the cable near the thimble
and position one cable clamp one inch away from the
thimble as shown above.
NOTE: The clamp must be positioned on the cable with
its U-bolt portion over the short section of the cable as
shown in the diagram above.
5. With the saddle portion of the cable clamp in position,
thread the nuts onto the U-bolt section of the clamp
and tighten slightly to maintain the position of the clamp
on the cable.
6. Install a second cable clamp on the cable six to eight
(6"-8") inches from the first clamp.
7. Tighten both clamps.
8. Open the turnbuckle to its longest position.
9. Repeat the above procedure for the remaining cable
assembly.
Thimble
Cable
Thimble
Turnbuckle
Cable Clamps Thimble
Cable
Turnbuckle
Typical Turnbuckle Assembly

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
Customer-Supplied
Baseboard
Cable
Assembly
Cable Assembly
Ground Level
B
A
QH1404
Band Clamp
CABLE PLACEMENT
The diagram and inserts below identify the placement and
proper way to attach the cable assemblies to the building.
1. Attach the first cable assembly at the bottom of the
center post using a band clamp as shown in drawing A.
2. Move to the top of the first interior rafter and wrap the
loose end of cable over the top of the upper purlin and
back under the purlin. Attach the remaining section of
the cable assembly using a cable thimble and two (2)
cable clamps. (See Drawing B).
NOTE: No turnbuckle is needed; only one (1)
turnbuckle is used for each assembly.
3. Secure the band clamp to the center post frame using
Tek screws.
4. Repeat the same procedures for the remaining
cable installation.
TIGHTEN THE CABLING
1. After attaching both cable assemblies to the building
frame, return to the first turnbuckle and tighten the
cables.
NOTE: Tighten the cables in each section evenly so
that the frame remains plumb.
2. After the first cable assembly is tightened, move to the
other assembly and repeat the tightening steps.
3. Continue with finishing rough edges and anchor the
frame.

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
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.
ATTACH END PANELS
CAUTION: To prevent damage, do not install end
panels on a windy day.
Gather the parts:
• Fabric clips #CC6214 (divide quantity in half.)
• Measuring tape
• Scissors
Assembly Procedure
1. With the proper lift (or ladders) positioned inside the
frame, pull the end panel up and over the top of the
end rafter.
2. Secure the end panel to the backside of the end rafter
at the top, center position using a fabric clip and Tek
screw.
NOTE: It may be necessary to trim or cut the vertical
pocket material to allow the panel to be pulled up and
into position.
DO NOT CUT THROUGH THE OUTER PANEL
MATERIAL IF YOU TRIM. CUT ONLY THE POCKET
OF THE END PANEL.
3. Verify that the end panel is positioned as desired and
centered in the end wall with its lower end touching the
ground evenly between the end rafter legs.
NOTE: The amount of end panel at ground level
depends on how much you pull up and over the top of
the end rafter. Adjust before securing to the rafter.
4. Using two (2) of the fabric clips, secure the end panel
to the center support in the vertical pocket. This will
help keep the panel in the position determined in the
previous step.
Vertical Pocket

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
5. At the top center position, secure the panel to the
backside of the end rafter pipe using a fabric clip and a
Tek screw.
6. 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.
ATTENTION: For each end panel, evenly space the
fabric clips as you work down from the top of the rafter.
Fabric clips are installed on the backside of the rafter to
prevent damage to the main cover when it is installed.
7. 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.
ATTACH END PANELS (CONTINUED)
Space below is reserved for customer notes.

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GROWSPAN™ROUND PREMIUM EXTRA TALL HIGH TUNNELS
MAIN COVER INSTALLATION
After the end panels are installed, install the main cover.
The steps to install the main cover include:
1. The double poly latch U-Channel (#104211) is attached
to each side of the frame and runs from the front to
the back of the shelter. The position of the U-Channel
attaches the cover to the extended cover with roll-up
sides. Tek screws are used to secure the U-Channel to
each rafter.
2. The single poly latch U-Channel (#102197) is attached
to the along the top of each end rafter between the
double U-Channel runs using Tek screws. This
U-Channel is used to secure the main cover. During
installation, the single poly latch U-Channel will bend
with the curve of the end rafter as it is attached.
3. Pull main cover over the frame.
4. Attach the main cover to the end rafters and double
poly latch U-Channel using the poly latch springs.
5. Single poly latch U-Channel will also be attached to
each side of the frame and runs from the front to the
back of the shelter. The position of this U-Channel
identifies the highest "open" position of the roll-up side
panels.
6. Finish the end rafters with single poly latch U-Channel
between the double and single U-Channel that are
attached on the sides of the frame.
7. Attach roll-up covers to the sides of the frame using the
double and single poly latch U-Channel; and poly latch
springs.
8. Install roll-up side kits, the anti-billow ropes, and test
the operation of the twist-of-the-wrist assembly.
INSTALL POLY LATCH U-CHANNEL
Attach double and single poly latch U-Channels along the
frame sides and single U-channel along the tops of the end
rafters between the U-Channel runs.
Gather the parts:
• Aluminum single U-Channel (#102197): End rafters
and sides
• Double poly latch Channel (#104211): Sides
• Tek screws (#FA4482B)
Assembly Procedure
1. Using the pipe joint between the drilled leg pipe and
the curved rafter pipe as a guide, attach the double
poly latch U-Channel flush along both sides of the
frame using Tek screws. The double U-Channel will be
attached over the center of pipe joint. See diagrams
below.
NOTE: If needed, remove existing Tek screw from the
pipe joint so the double poly latch lays flat against the
rafters.
Double poly latch
channel along the
side
Single U-Channel
on top of end
rafter
8" Splice Section
Tek Screw
Tek Screw
Cut one (1) double poly latch channel into 8" pieces
to use to splice the longer double poly latch channel
sections together.
The insert above shows how to splice the joint between
two sections of double poly latch channel. Use Tek
screws and an 8" section of double poly latch channel
and place the channel on the back of the poly latch (or
to the inside of the frame). Install Tek screws through
the double poly latch channel from the outside of the
frame and into the 8" splice section.
Single U-channel
(#102197)
Double U-channel
(#104211)
42R1902 104211
42R1901D