Greenhouse Structure and Frame Materials

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There are several frame types being used to construct greenhouses. Depending upon your needs some are better than others. The chief structure materials are galvanized steel, aluminum, PVC, fiberglass and wood.

Galvanized Steel
Steel is one type of framework used on kits. It is strong, and galvanized steel will be rust resistant. But it will rust a bit. Because of the weight, it will cost more to ship than other materials. It is not readily available for do it yourself construction. Galvanized steel tends to be used on the lower end greenhouse kits, but it can be found on the more expensive ones too.

Aluminum
Aluminum is strong, will not rust, and lightweight. Round or square tubing is used, depending upon the covering material to be used on it. Square tubing is available from building supply stores and this material could be used to construct a greenhouse frame. Drilling holes in it is fairly easy, so fiberglass panels or polycarbonate sheets could be fastened to the structure.

PVC
PVC pipe can be uses to construct a Quonset type greenhouse frame. It is readily available, fairly cheap and easy to work with. Up to one inch diameter can be bent for form hoops over which Polyethylene film can be stretched. Ends can be constructed from either plywood or fiberglass sheets. Fiberglass sheets can also be screwed to the hoops to form a cover over the frame.

Wood
Treated wood can also be used to construct a greenhouse. This type of structure would be a bit harder to build. Just about any type of covering could be installed over a wood frame. It is strong enough for glass, Polyethylene films can be stapled to it and polycarbonate or fiberglass sheets can be screwed to it. Wood is the most versitle material to be used for a greenhouse structure. Besides pressure treated lumber, cedar and redwood can also be used for greenhouse construction. Both are lightweight and strong. Redwood is the most readily available and tends to be used in high end kits. Greenhouses constructed from redwood are both attractive and longlasting.

Fiberglass
Fiberglass tubing is also used as a greenhouse framing material. An advantage to this material is that it will not conduct heat or cold easily, thus helping keep heat in and cold out.

The materials used for a greenhouse frame must be strong, lightweight and water resistant. A number of materials fit this description. All are used in various types of greenhouse kits, some suitable for easy do it yourself greenhouse structure construction.

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