Rebecca Norman wrote:We used film for years, and are now using polycarbonate in some places. When price-shopping for polycarbonate or film, make sure it's UV-resistant. Our site gets very strong gusts of wind so the film does tear after just a few years; it also sometimes makes a roaring noise in the wind, which is irritating because the greenhouses are attached to our houses. Polycarbonate and glass are a lot quieter in wind. We do get some snow but because we always build so the greenhouse glazing is on an angle, the snow slides off. With film, you can go inside the greenhouse and punch upwards to jolt the snow off if it is sticking and making the film sag, but with polycarbonate I don't think it would be a problem.