Square tubing is available from building supply stores and this material could be used to construct a greenhouse frame. Round or square tubing is used, depending upon the covering material to be used on it. AluminumĪluminum is strong, will not rust, and lightweight. Galvanized steel tends to be used on the lower end greenhouse kits, but it can be found on the more expensive ones too. It is not readily available for do it yourself construction. Because of the weight, it will cost more to ship than other materials. It is strong, and galvanized steel will be rust resistant. Steel is one type of framework used on kits. The chief structure materials are galvanized steel, aluminum, PVC, fiberglass and wood. Depending upon your needs some are better than others. There are several frame types being used to construct greenhouses.
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