GrowSpan PB01670R4, Manual

8

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