How to choose a greenhouse polycarbonate
Growing of vegetables and other crops in greenhouses for personal use and to implement promises significant benefits.High technical and operational characteristics show a greenhouse with a metal frame, covered with sheets of polycarbonate.There are many original designs of different shapes and sizes of industrial and homemade. If you need high-quality greenhouse, but you do not know how to choose a greenhouse made of polycarbonate, it is to solve this difficult task will help our detailed material.
- material and design of the frame
- What polycarbonate should be used for greenhouses
- Determine the form of the greenhouse
- Dimensions greenhouses and individual elements
- mount structure to the foundation
material and design of the frame
classic greenhouse is a structure designed to ensure that agricultural protection of plants against environmental factors.Its basis is the carrier space frame shape.With the construction of gr
to manufacture load-bearing frame of the buildings used galvanized thin-walled steel pipe section or a rectangular or square cross-section.Each of the above material has its own advantages and characteristics that must be considered when choosing it as the basis for the greenhouse.
galvanized bent profile
galvanized steel profile is lightweight and affordable price.Moreover, its mechanical strength is clearly insufficient, offset by the use of a larger number of elements.The connections between the individual parts of the frame need to be further strengthened.Often this skeleton is composed of a plurality of joints, and the thickness of the metal is only 0.5 - 0.8 mm, which is not enough to withstand the peak wind and snow loads.
galvanized bent profile
frame from galvanized profile
Steel profile rectangular or square
carrier frame welded from steel tube of rectangular cross section, are durable, highly resistant to permanentand alternating mechanical loads.The main drawback is its tendency to corrosion and need to protect the parts against corrosion.Greenhouse frame is rather complicated to manufacture, which determines the high cost.Arcs of greenhouses consist of only a few items, and may be generally solid.
Steel profile square
greenhouse frame steel profile
choice of material for the construction of the frame is carried out based on the requirements and possibilities of the customer.If you are going to purchase ready-made greenhouse, it is likely that you will be offered framework on thin-walled profiles, less can be frame profile of rectangular or square cross-section.The best option is the strength of the frame profiles of rectangular or square cross-section.The frame of a thin profile will be less robust, but is much cheaper and there is a good chance of running into a low-quality manufacturers who do in order to save frame is not rigid enough.
However, this does not mean that should abandon such a framework.Just before purchasing a greenhouse, you must make sure that he is really strong, and the thickness of the metal is not less than 1.2 mm.Typically, each vendor has samples of skeletons, you just do not be lazy to come and to consider carefully the options available.If the seller is hiding in every possible way and shows samples of carcasses is a good chance that you will sell low-quality product.
When you select a frame and pay attention to the following points:
- How many elements are composed of the arc, so that they are perfectly tselnognutye.
- It is best if the profile of the frame has a rectangular section 20 × 40 mm, this is especially true for greenhouse base, because if it is made of the profile section 20 × 20, this may not be enough.
- metal thickness should be at least 1.2 mm., Otherwise there is a big risk that the greenhouse does not stand for long.
What polycarbonate should be used for greenhouses
great importance for the performance of a greenhouse cover.When choosing polycarbonate for greenhouses must take into account the following parameters: type of polycarbonate;Choose light stabilizing layer;material thickness.
Today, the market has two types of polycarbonate - cellular and monolithic Among these materials the best characteristics for use as a roofing material greenhouses has polycarbonate.
Polycarbonate is a sheet of thermoplastic material from the group consisting of two or more layers with internal longitudinal webs.This plate structure provides excellent technical characteristics and performance of the material.
The most important of them in the construction of greenhouses are as follows:
small proportion of
high thermal resistance
Resistance to climatic conditions
High mechanical strength
Specifications relevant to a decision on the choice of cellular polycarbonate for the construction of greenhouses are presented in the table:
|sheet kg / m2||0,8||1,3||1,5||1,7|
|sheet size length × width, m||6 (12) × 2,10|
|Thermal conductivity, W / m 2 ° C||3,9||3,7||3,4||3,2|
|light transmission ratio,%||83||82||82||80|
|maximum and minimum temperature, ° C||from - 110 ° C to 145 ° C|
|minimum bend radius,m||0,7||1,05||1,5||1,75|
presence of light stabilizing layer
quality polycarbonate has excellent light transmitting characteristics of the electoral nature.It almost completely absorbs ultraviolet radiation with a wavelength of 400 nm or less, the most dangerous for the plants and maximally transmits beams of visible and infrared range.This helps to create the greenhouse effect.
To protect polycarbonate from the destructive effects of ultraviolet radiation on the outer surface applied, by co-extrusion, a layer of light-stabilizing agents.Learn about the presence of such a protective coating may be relevant to the inscriptions on the protective film, glued to a sheet of polycarbonate.Here you need to be careful.If the protective film have special markers, which means that they are designed for indoor applications.
attempt to use such material for the production of the greenhouse lead to premature coating failure.One of the most important properties of polycarbonate is its ability to maintain its technical characteristics throughout the life of the panels.Some vendors claim that UV protection is the mass of material.In fact, it is not enough and it is intended not only for the assumptions of destruction of the material during storage.
When choosing polycarbonate for the construction of greenhouses is critical sheet thickness.This parameter directly determines properties such as the panel transmittance, the level of thermal conductivity, and the ability to withstand mechanical stress.For the construction of greenhouses are usually used sheets with thickness from 4 to 10 mm, the most suitable for the main parameters.
sheet thickness is determined based on the characteristics of the carcass structure, an increase in this parameter increases resistance to wind and snow load.In some cases, the same construction may be used different panels.For flat or arched roofs apply sheets of greater thickness, and vertical walls made of thinner panels.The most optimal is the use of polycarbonate thickness 4 - 6 mm.It is necessary to ensure that the thickness of the panel declared by the manufacturer, is the actual.To do this, the panel can be measured shtangeltsirkulem.If not matching the declared and the actual thickness of the polycarbonate sheet from the use of such material should be discarded.
In no case do not agree to buy polycarbonate thickness of 3.5 - 3.7 mm.At the same time sellers can say that the material has greater density so it can be used instead of 4 mm thick sheets.But most likely it is the poor quality polycarbonate, which has a very low lifetime.
If polycarbonate is easy to bend against the fingers and has a designation with its light hand is the stabilizing layer, before you cheap material, which has a lifetime of up to 2 years.
The selection process for the construction of polycarbonate greenhouses should pay special attention to the following points:
- Compliance panel thickness declared by the manufacturer and specified in the documentation and on the packaging.
- A safety film on both sides, which protects them from premature wear.
- Available documentation for the whole game: certificates of conformity for products and passports.
Determine the form of the greenhouse
There are several varieties of agricultural plants of this kind.
Their main types can be classified as follows:
Greenhouse arch is a structure with a semicircular ceiling.Spatial framework consists of arcs at a certain distance from each other by transverse connecting members.This type of greenhouse is most prevalent among the population.The construction can be quite easily increased or decreased in length.This is done by adding or removing individual sections.
Greenhouse arch type with lifting sidewalls (greenhouse Butterfly)
This building has a rather modest size and is rather a greenhouse, its main convenience is the possibility of easy access to a bed and organization of ventilation of interior space, if necessary.
greenhouse with drip form arches
It consists of two curved surfaces of the connection line, which forms an acute-angled horse.This arrangement prevents the formation of snow on the slopes.Additional stiffener eventually contributes to the strength building.
Shed or scaffoldings greenhouse
simple structure, which is used as a support structure enclosing structures of residential or office buildings in the infield.In the construction given a large enough angle to the vertical slope that prevents the formation of stable snow cover on the surface.The building is located on the sunny side of the building to maximize natural light.
classic gable greenhouse until polycarbonate plastic has been the only possible form.In appearance, it resembles an ordinary house vertical walls and a flat roof.Simplicity of design allows its production without the use of equipment for arc arch arching framework.Such a structure can be built in any material, including wood.
When choosing the form of the greenhouse owner is governed by several factors, primarily its purpose and its own financial resources.For growing seedlings and small enough to be near-wall structures or greenhouse with lifting walls.Production of vegetables require a solid arch or gable greenhouse with corresponding costs.
Dimensions greenhouses and individual elements
In determining the amount of a greenhouse in the first place is taken by its purpose and planned production volumes.Design work even in the most simplified form can adequately calculate the required amount of material.
General rules for the implementation of such measures follows:
- necessary to set the length, width and height of the building.This takes into account the area and configuration of the site and ease of work in the greenhouse.
- determines the angle of slope of the roof, providing spontaneous drift of snow.
- In determining the size of the door should be noted that the person in the course of work will be to carry tools and agricultural implements.Apart from the entrance to the wall provides the transom flap for ventilation facilities.
- device framework should be such that the joints of individual sheets of polycarbonate Mezhuyev should fall on its elements.This approach can significantly enhance the design.
mount structure to the foundation
vast majority of greenhouses are relatively easy to design and large sail area, and can be turned by the wind.Greenhouses Polycarbonate must be carefully anchored to the ground, which may take the form of strip foundation with a brick or stone plinth.The device is similar to the support structure requires significant investment and is only applicable for sufficiently large stationary greenhouse.
mount bearing frame to the foundation is done through the use of embedded elements.Construction of steel pipes are usually welded to a special metal and imbedded into the ground.Structures made of galvanized profile fastened to the masonry by means of dowel-nails or anchor bolts.The latter method is more reliable installation.
The choice of greenhouses made of polycarbonate is reduced mainly to the determination of its size and forms the basis of its purpose and possibilities of the owner.Quality construction must be properly installed in the area that will ensure its long-term operation.