Short Answer: Some Growasis systems require 3/4″ thick plywood and/or foam insulation panels. These items are not practical to ship.
In the case of Growasis Elevated or Double Decker systems, you will need to pick up one or more 3/4″ x 4′ x 8′ sheets of OSB plywood for the liner support. Only use OSB plywood at the recommended thickness or greater to prevent sagging and potential breakage due to the water weight. The number of boards you need will be indicated by the dimensions you input into the design calculator on each Growasis product page.
Should you require insulation panels for your trough use only 1″ x 4′ x 8′ standard foam board insulation.