1/17/2024 0 Comments Cinder block greenhouse![]() ![]() ![]() They are best adapted to pot plant production and are available is several widths. These aluminum or plastic channels are placed on supports that pitch from an irrigation supply end to a sump. Cost is competitive with the metal materials. With heavy plant loads, the top may sag if not supported properly. Typical panel size is 1½-foot x 3-foot or 2-foot x 4-foot. Tops molded from recycled polypropylene plastic are easy to assemble and provide protection from chemicals and rot. The expanded metal is frequently inserted into an extruded aluminum frame requiring little maintanance. Standard material needs to be supported on 24-inch centers. Available in widths from 2 feet to 6 feet in panels to fit standard benches, metal thickness is usually 13 gauge. This is the most common material for strength and long life. Welded wire can also be formed into self-supporting bench tops (Channel Top) that eliminates the need for cross frame supports. Welded wire can also be obtained with a colored plastic coating to give a better appearance. Purchase wire mesh that has been galvanized after welding. It is best to use a 10- or 13-gauge wire with a 1½-inch x 1½-inch mesh to avoid too much sag. This low-cost option that makes a good bench top if adequate support is provided. Strong and easy to fabricate, their use is generally limited to garden centers. Long-life wood such as cedar and cypress are too expensive for large installations.Īnother expensive alternative is composite lumber made from sawdust and plastic. Nails and screws need to be specially treated to reduce corrosion. Home centers and lumber yards usually carry ACQ (Alkaline Copper Quat) 1-foot x 6-foot lumber or 5/4-inch x 6-inch decking. To get a longer service life (20 years or more) select pressure treated lumber. It is easy to roll out on the bench supports. This has stained ?-inch x 1½-inch slats and is available in 4-foot x 50-foot rolls. They provide adequate support for the plants, but the life is limited and the edges often break from use. Used pallets are modular and available in several standard sizes. The containers should also slide easily, resist corrosion, be without sharp edges, and install easily. The material should be strong without sharp edges and sag so the containers remain level. They can also be mobile and handled on conveyors or carts.īench tops can be made of materials, wood, plastic, wire mesh, or expanded metal. Bench tops can be fixed in a conventional or peninsula arrangement or movable to increase growing space. A less expensive alternate is concrete blocks with tubing or pressure treated lumber runners. This has a long life and is easy to construct. The most common support for the bench top is galvanized steel tubing or pipe. Besides getting the plants up to a working height, benches provide better drainage and allow air movement for more uniform heat and better ventilation. The greenhouse bench system can cost more than the greenhouse frame. ![]()
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