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greenhouse frame

Galvanized steel provides durability at a low cost. There is less physical framing needed, because of it's strength, so there are less shadows projected into the greenhouse. However most steel frames are designed to be used with polyethylene film. They're popular with commercial growers. A big negative for galvanized steel is that the galvanizing will eventually wear and the steel will rust. PVC Plastic is low cost, lightweight (portable) and easy to assemble. It's not as rigid as metal or wood, but the industry is addressing that with metal supports used in conjunction with the PVC. Plastic is also offers limited heat loss. Most hobby greenhouses now come with PVC frames. The biggest negative for PVC is that sunlight can deteriorate it.