Building the High Tunnel

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Tunnel Construction



Hail v. High Tunnel


Click here for a photo gallery of the construction of our High Tunnel

Click here for a photo gallery of the planting of our High Tunnel

Click here for a photo gallery of the harvesting of our High Tunnel.

Click here for a photo gallery of the Hail V. High Tunnel.


The building site.

Batter boards help determine the exact placement of corner posts.

The flag marks the position for the first post.

This post pounder came with the kit and kept the end of the pipe from being damaged by the sledge hammer.

All posts pounded in and level.

The rafters are composed of seven pieces of pipe.

The pipes are secured with a screw at each joint.

The rafters are all laid out next to the ground posts.

The rafters are lifted into place by tying a rope to the center of the rafter and pulling up toward the scaffolding, then bolted to the ground posts.

Perlins are loosely attached with clamps at this point.

Thanks to the help of good neighbors, it only took about 3 and a half hours to lift and secure all of the rafters.

It is starting to look like a high tunnel now.

This "jig" was used to ensure a 4'spacing between the rafters. A bungee cord held the rafters together as the clamps on the perlins were secured.

It was tedious work and took quite a bit of time to position and tighten the clamps and screw all of the perlins together.

Duct tape is wrapped around each clamp to prevent damage to the cover.

Pressure treated base boards are bolted to the ground posts.

We will anchor the tunnel with 12 four foot anchors.

Anchors away !!

Rafters are secured to the anchors.

Ribbon boards are added. This marks the height of the roll-up sides.

"U" channel is secured to the ribbon board. This will secure the top cover when it is installed.

The end is ready to be installed.

The end is held on place with clips and tek screws.

"U" Channel is attached to the end rafters.

With both ends completed and all "U" channel secured, it is now time to cover the top.

Six ropes are tied to the edge of the 48' X 75' sheet of greenhouse film. The ropes are then thrown over the rafters.

Everyone grabbed a rope and pulled the cover over the rafters. It was easy.

The cover is attached to the end rafter first.

The cover is attached to the "U" channel using "wiggle wire".

We have already had some high winds to test this method of attachment. It held up real well.

With the side roll up assembly completed, this project is done. Whaw Hoo!!!!!