Whether you build a greenhouse or purchase a DIY kit, one of the most important decisions you’ll make is what type of frame to use. Greenhouse frames are made from various materials; each type has advantages and disadvantages. The most common greenhouse frame types include galvanized steel, wood, PVC, composite materials, and aluminum.
Galvanized steel frames can be strong and durable, providing excellent support for the greenhouse structure. Galvanized steel is coated with a layer of zinc to protect against rust and corrosion. However, galvanized steel’s low profile (how thick the beams are) may become a disadvantage and generate more cost if they require reinforcing with wooden beams.
Wood frames can provide a more natural and aesthetically pleasing look for a greenhouse. Cedar and redwood are popular due to their natural resistance to decay and insects. However, wood requires more maintenance than metal frames and may be less durable in the long term.
PVC is a lightweight and affordable option for greenhouse frames. While it is not as strong as metal or wood, PVC is easy to work with and can be a good choice for smaller, temporary greenhouses. PVC is not recommended for a larger, more permanent structure.
Some greenhouse frames are made from composite materials, which can offer a combination of strength, durability, and low maintenance. These materials often blend wood fibers and recycled plastics but may be hard to come by.
One of the most popular choices for greenhouse DIY kits on the market is aluminum. Aluminum is strong, lightweight, and resistant to rust. It is also relatively easy to assemble and is usually
anodized or powder-coated for extra protection against corrosion. However, not all aluminum frames are created the same.
One of the most important things to consider with an aluminum frame is wall thickness. When you look at the end of an aluminum piece (also known as the profile), you can see how thick the connecting parts that make up the extruded aluminum structure are. The thickness of these structures is the wall thickness. The wider the wall, the stronger the frame and the greater its ability to bear heavier loads.
Another thing to check for with an aluminum frame is something that is rarely mentioned. It’s important to check the weight of the greenhouse. Most of the weight is the frame. Polycarbonate panels weigh very little. When comparing greenhouses, the weight will tell you a lot about the quality and strength of the aluminum.
The choice of material for a greenhouse frame depends on factors such as budget, climate, desired longevity, and aesthetic preferences. Whatever you settle on, do your homework first and ask questions. The frame is one of the most significant investments in building a greenhouse.
