Answer: Although ordinary window glass can be used in greenhouses, there are a number of greenhouse glazing materials including dual walled plastics and even plastic sheeting available for sale to home gardeners. Some of these will discolor over time and reduce visibility and light transmission so it is a good idea to read manufacturer's claims carefully. Charley's Greenhouse Supply for example (1-800-322-4707 http://www.charleysgreenhouse.com) offers several types. You will also find many advertisements for home greenhouse materials and supplies in current issues of gardening magazines. There are many factors to consider when renovating a greenhouse in addition to which glazing material to use, so before making any decisions you might want to read up a bit on greenhouse basics. This article http://www.wvu.edu/~agexten/hortcult/greenhou/building.htm from the University of West Virginia Extension might be a helpful beginning. Good luck with your project!
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