Frequently Asked Questions
Yes. We have alternatives to treated lumber that can be used in our system installation that will allow you to maintain your Organic status.
Four Point Cross-Braces
Our tunnels have 10 ft by 1 and 3/8" galvanized steel tube Cross-Braces at each of the four corners of our tunnels. Each Cross-Brace connects to the end hoop with a nut and bolt, and runs down to the 2" galvanized steel base frame where it is connected to the base frame with a nut and bolt. These Cross-Braces add wind protection to the tunnel and keep the end-walls of the tunnel plum and structurally sound.
Full Length Purlins
All of our tunnels come with full length purlins made from 1 and 3/8" galvanized steel tube that run along the hoops from one end-wall hoop to the other end-wall hoop. Our purlin ends have been flattened with a hydraulic press, and these flattened ends are drilled to allow the purlin itself to connect to the end-wall hoop with a braceband-nut-bolt system.These purlns add additional wind bracing to the tunnel.
The purlins also maintain proper hoop spacing throughout the full length and height of the tunnel because the purlins are connected to each of the hoops using cross-connectors. Maintaining the four foot spacing between each of the hoops all the way through to the peak of the system is important for the wind-bracing ability of the tunnel as well as for the overall strength of the system.
More options exist for wind-bracing as add-on's, feel free to call to have a detailed conversation of what we can do for your climate.
If the ground is very rocky, we recommend using a "break" that is slanted at the same slope that your angle irons will go into the ground. Using the "break" should bust up or move bricks, old foundation, and other debris enough to provide an angular path for your angle irons to set in.
Base Boards are a High Tunnel Hoop House component. They run the full length of your tunnel, on both sides, and are located at the base of your tunnel near / on the ground. Baseboards are used in conjunction with other tunnel components to add structural stability, add weight to your system, give roll-up sides a location to rest, and allow the roll-up sides and tunnel's plastic to avoid direct contact with the ground. There are treated lumber, untreated lumber, and metal options that can be used as "base boards".