Fiberglass greenhouses are considered on par with glass models, with main criticisms being they get dirty and become easily discolored. The fiberglass used to make greenhouses usually comes in corrugated sheets or rolls. It’s translucent and its light transmission is pretty much even with glass.
Fiberglass greenhouses cost less than glass and won’t shatter in a wind storm or break when the ground shifts. Fiberglass and polycarbonate panels are both more efficient heat retainers than glass. Glass also requires a more complicated superstructure.
Fiberglass greenhouses that are made of low-grades of fiberglass are gel coated with a UV-blocker. This coating bakes off in the sun in about 6 years and causes a yellowing of the fiberglass. Aluminum, galvanized steel, PVC, wood, and polyethylene are all materials that might be used to construct a greenhouse – the best for you is determined by your budget and your needs.
