Save on shipping: Buying our prebuilt packs will save on shipping!
Our Spring Wire upgrade kit helps turn your Caterpillar Tunnel into a more permanent greenhouse solution. Spring Wire allows you to have tighter plastic, or help hold down shade cloth on your Caterpillar tunnel.
In most cases, we recommend pairing Spring Wire with our Wind Bracing upgrade kit, allowing for increased wind protection, plus eliminating the need for the cone-shaped plastic bunching at each end of your tunnel. This is especially helpful on urban farms or other situations where space is limited.
The Spring Wire upgrade contains 93 inches of base channel and 93 inches of Spring Wire. For typical installations we recommend 4 sets, allowing for two sets of Spring Wire and channel on each end bow. If you want the Spring Wire to extend all the way to the ground, you will need 6 sets for standard tunnels (3 for each end bow), and 8 sets for tunnels with a lift (4 for each end bow).
Recommended quantities for framed-in end walls are as follows:
- 6 – 8 sets (3−4 for the top edge of each end bow)
- 6 – 8 sets (for the door and framing)
For example, if you put an end wall with doors on both ends, you will need about 18 sets of Spring Wire and channel. Additionally, because wiggle wire is expensive to ship by itself, we recommend purchasing them with a freight order, and padding the amount slightly.
We offer the 5‑pack, 10-pack, and 20-pack bundles to save on shipping costs.
Note: The way you frame in your end and the entry system you use will affect how many Spring Wire sets you need. Our recommendations are general in nature and ultimately the amount needed will depend on your plans/context.