Tag Archives: greenhouse tunnels

Hanley Caterpillar Greenhouses

Click here to download our hanley tunnel brochure! (please see pricing below) or more info on our Hanley Application Page

Check out our Hanley Assembly overview 

We offer these structures with 17′ wide hoops at 6′ increments, standard.
Ultimate in Low Cost, Portable Season Extending Greenhouses

A note of caution…
At 6’ rib spacing, these structures are not intended to, or capable of handling very much snow load. This tunnel can handle greater loads by simply reducing the rib spacing and/or increasing the length of the anchor pegs.

Pricing can be done as a complete package or as “required components”
(prices as dependent on quantity purchased)

5/8” rebar (48” recommended)
Base plate with clasp
Rope (1000’ spools)
25’ or 28’ wide 6mil clear plastic

Sample prices, including plastic
17×100 @4 = $2659… sections are $98.35
17×100 @ 5 = $2254… sections are $102.70
17×102 @6  = $2019… sections are $107

 Our prices exclude installation, end anchors, freight & taxes unless otherwise specified. Please inquire with any concerns.

HST & Freight are extra, prices current as of June 2018 – please call for current quote

Structure details

17’ wide with 92” centre height
1”x2”x24’ galvanized 1 piece ribs
Ribs typically spaced at 6’ apart
5/8” rebar (2 per rib) 48” long suggested
1/4” polyester rope
Base plates with clasps

Additional Notes

It is important to get the correct amount of inward lean on the anchor rods. If they are too vertical, it will be a challenge to get the rib on and if they are leaning too much they will loose some of their holding power.

Proper tension on the rope is critical to the success this type of “greenhouse” since it is the rope which is holding the plastic in place. The plastic is secured lengthwise between 2 stakes which should be a minimum of 12’ away from the last rib. By pulling and securing the cover lengthwise first, you will minimize the cover dipping between the ribs.

We now have a modified Hanley which is narrower and taller, with a two part hoop. Pricing is available upon request. Due to the substantially different wind dynamic, the modified Hanley is not suggested as your first Hanley experience.

Season Extension: Hanley Caterpillar Tunnels

The third area to discuss regarding season extension are those structures that are simple enough to disassemble and relocate to another spot-primarily referring to Hanley Caterpillar Tunnels.

The real lure of these buildings is their low cost and simplicity to move. Generally the area is prepared in advance and then the tunnel is moved over the area when the planting is to be done.

Since the original design specified 6′ hoop spacing, the intent was always to remove the cover before risk of heavier snow fall. More often now, growers are going to 5′ spacing (and sometimes 4′) to allow the covers to remain on longer or even permanently.

By having a smaller hoop spacing, it allows the cover to stay on permanently, which allows for a much earlier start in the spring.

The key to the concept of the hanley working is in the rope.

  • The back and forth pattern of the rope resembles the way a person would lace up a boot.
  • Typically there is a spring loaded clip at the base where the rope passes through.
  • Once the rope is fully installed, it is important to tighten it through three passes from end to end.
  • If the rope is not tight enough, the wind will create wiggle and movement sideways.
  • When the plastic is tight enough, it also allows the grower to slide the plastic up the hoop to allow ventilation.

Generally the plastic is about 25′ longer then the tunnel.
This allows the installer to bunch up (pig tail style) the extra poly at both ends between a pair of posts.
It is important to get the plastic as tight as possible lengthwise first.
There must also be a rope from the top of the last hoop to the tie off post.

There are a couple of challenges to consider with the hanley tunnels.

  1. One of these challenges is to create a proper entrance. Typically entrance is achieved by slightly lifting the plastic and ducking underneath.
  2. The other are of challenge is the low shoulder height of the structure. This restricts the use to a couple rows of taller items in the middle and a couple rows of shorter plants along the side. The width of the tunnel does lend itself to three regular size beds.

Once you have learned about the nuances of the hanley tunnels, and asked any questions that come up, you will be better prepared to have these efficient season extenders work for you and your application.

Feel free to look at our Hanley Application page for more information and photos, and give us a call with anything else you require.

We are pleased to have many happy customers these structures are working for, and look forward to you being next!

This concludes our week long series of Season Extension. Check out our new book if you want to know more “So You Want to Buy a Greenhouse…Your Guide to Planning a Greenhouse Purchase”