Continuing the review on the market of St. Petersburg designs of greenhouses, which began in previous releases, discuss the design features of frameworks and consider the various options. In our opinion, the best choice of material for a greenhouse frame is a metal profile. On its merits, we mentioned in earlier editions. Now take a closer look at the materials. One option the material or aluminum corner profile. The advantage is its ease and low corrosivity. Under normal conditions, the metal is covered with an oxide film, and practically does not react with other materials.
In addition, this material is easily has been processed, even with hand tools. Assembling the frame greenhouses made of aluminum produced at the bolted joints. However, during the operation greenhouses there is a need to make different fertilizers in the soil. Including chemicals containing ammonium salts. In this case, the protective coating frame can be broken, and then in a short time aluminum will literally crumble, which significantly worsen the rigidity of the frame, as well as can be lead to its destruction. Not in favor of this material is the fact that scrap aluminum has a high value on the market. Therefore, it is likely that one day in spring "happy" summer visitor finds plot only the broken parts of your favorite greenhouses, a skeleton is stolen what some ushlymi homeless. Would not wish this to anybody, but when choosing the material must be taken into account such problems.
The most common material used in the construction of suburban greenhouses is a steel profile. Compared with aluminum, he, of course, require additional anti-corrosion treatment, but much cheaper and allows the assembly to welding or sheet joints with locking fasteners with special screws. Important when choosing a material is the wall thickness of the steel profile and its cross section. Frequently used profile 20x20 mm for arcs and transverse bars, and for the frame base profile 40h20 mm. Even if you use the same profiles of greenhouses on the market value is significantly different from different manufacturers. Under equal other costs big role in the formation of prices for finished playing a greenhouse wall thickness profile. Of course, the thicker, the better. But we must be clear value for money when choosing a frame material. When operating the greenhouses in the climatic zone of the Leningrad Region with snow cover up to 1 m can be considered the best use of steel profiles with a wall thickness of not less than 1,5 mm. Calculations and practice show that such a greenhouse can withstand snow loads of up to 80 cm around the greenhouse. It should be noted which is largely resistant to the greenhouses snow loads depends on the design features of the framework. The next issue we consider the most common options frameworks of greenhouses.