Over the years I have worked with several people who had the pleasure of being able to afford a professionally designed and manufactured greenhouse by one of the many custom builders in the states. What makes these glass houses "professional" level is: (a) they are built of structural steel and/or aluminum and glass rather than wood; (b) sometimes insulated glass is used, if required. The higher rigidity of aluminum and steel versus wood allows thinner sections to be used in the construction, which increases the amount of light that reaches plants. Professionally built greenhouses are almost always erected on a solid concrete foundation that in most places requires that permits and zoning variances are applied for ahead of time. Many of these houses are available in varying widths and lengths and with a selection of trimmings like finial posts and aluminum roll up shutters, as shown in the picture of a Texas Greenhouse.
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