Side posts and columns are vertical supports that dictate the height of the production area. Framing Materials Aluminum is the most economical material for constructing the greenhouse frame. It can be shaped as needed to form various structural components of the greenhouse and needs no maintenance after installation. Aluminium framing also has the longest life span and allows for light reflectance. Steel is commonly used but must be painted or galvanized to resist high moisture conditions within the greenhouse.
Steel needs more maintenance than aluminum and is heavier, requiring additional support.
Wood was once a common framing material, but it has steadily lost popularity for a number of reasons. The main disadvantage of wood is that it deteriorates over time. If wood is desired, pressure treated lumber should be purchased and then treated with commercially available coatings. Coverings Glass allows maximum light transmission in greenhouse production. Despite this, there are several disadvantages to consider.