It is not surprising that lightweight building material — cellular polycarbonate, sold in sheets — is used for the manufacture of greenhouses; therefore, greenhouse structures may have different parameters and shapes. Their foundation is necessarily a strong frame, which is made of steel profiled pipe with a cross section of 20x20 mm. Metal or aluminum profiles with corrosion protection can also be used. The frame is sheathed with sheets, the optimum thickness of which is 4-6 mm. Compared to glass, the material is flexible, simple and easy to use, there is no brittleness.
Features of greenhouses from cellular material
The main requirement for polycarbonate greenhouses - the presence of good ventilation in hot weather. This is necessary to ensure that the lining does not overheat, as the geometry of the cellular sheets will change under the influence of high temperatures. To avoid an increase or decrease in the size of the skin, it is best to install in late autumn or early spring. Deformations occur when the sheet is enlarged, and gaps are formed when their parameters decrease. The optimum air temperature for installation work is + 10 ° C.
The greenhouses made at the factory differ among themselves in parameters, forms and constructional decision. However, not everyone can afford to buy such facilities, and then comes a bold decision - "I'll make it myself." What size should have a mini-greenhouse, depends on the area of the garden plot and the planned number of planted plants. Garden designs in a lightweight version have become indispensable in home gardens, because several dozen beds will be protected from the weather and cold, which means you can get an early harvest.
For the cultivation of seedlings, herbs or seasoning in small quantities suitable small greenhouse facilities of the ground type, which can easily be lifted and transferred to the desired location, so that does not create problems when planting plants in the ground. If there are many seedlings, or it has tall stems, then the design should be buried, and the optimal parameters should be observed, which should not exceed 150 cm in width and height. Any length can be as far as the plot and personal desire allows.
When creating a polycarbonate greenhouse with opening roof, three simple and convenient models can be used:
- Single slope;
- Arched greenhouse snail.
Regardless of the geometric shape, a polycarbonate greenhouse with an opening top is convenient and practical. Such a garden structure requires the correct calculation of materials and is carried out on the basis of a previously prepared technical drawing. The most practical way to select the parameters is the dimensions of the cellular sheet, whose width varies from 600 to 2100 mm.
In order to avoid a lot of waste, leading to unnecessary costs, the design should be designed taking into account the parameters of the sheet.
The presence of an opening roof allows you to adjust the temperature inside the structure, which excludes overheating not only plants, but also polycarbonate sheets. The technology for creating greenhouse structures depends on the shape and design features of the upper part of the structure intended for opening. There are several common types of greenhouses, and it will not be difficult to make them yourself.
Rectangular model with single and gable roof
To create a polycarbonate greenhouse with an opening top, it is necessary to first assemble the frame.
The most simple and low-cost models include a construction with a lean-to roof, which is a regular box, which is sheathed with cellular material from four sides, and the upper opening part is tilted. The main disadvantage of this design is the slight inclination of the rising roof, which causes inconvenience during operation and there are negative points for plants. In case of insufficient inclination, the snow is delayed, therefore, the top should be cleaned on its own. And the plants do not receive enough sunlight, which affects their activity and development.
Shed option suitable for small-sized greenhouse, because only in this case, the movable frame for the upper part can be reliable and durable. When you increase the size will have to use thicker sheets, which are worse to let the light.
More convenient to use is the dual-slope version of the greenhouse structure, which is a mini-greenhouse of small dimensions. The gable roof has a sufficient inclination and therefore copes well with mechanical loads. This is an ideal option for creating recessed type greenhouses. This design allows you to grow stunted and tall culture.
With whatever accuracy the installation of the moving top is done, natural ventilation will be surely present, which is so necessary for greenhouse structures. At the price, the dual-slope model is much more expensive than a single-slope model, but if the installation is carried out on its own, then the greenhouse will be cheaper. You can make the opening top with one and two sides, the second option will affect the cost of construction.
Cellular polycarbonate is attached to the frame with special screws.
Arched shell model
Open-top greenhouse "snails" are common variants for the manufacture of which flexible polycarbonate with hollow cells is necessarily used. The semicircular arch of the shell greenhouse is not affected by condensate. The accumulated moisture leaves the walls and does not affect the planted crops. The height of the arched mini greenhouse should correspond to the varieties of plants that it is planned to grow in it.
This model can be of two types:
- The lower part has the shape of a box, the upper part is an arched roof, movable on one or two sides.
- Without a box with arcuate sides to the bottom with one-sided or two-way opening.
The arcs are bent out of the profile pipe by means of a special tool. All prepared elements for the bottom (frame) and the top are joined by welding. It is necessary to decide in advance which side portions will be lifted in order to equip them with axial strips previously cut at a 45 degree angle. For ensuring mobility of the top part hinges are established.
Completely made design is established on the prepared base. The disadvantage is a small height, not allowing to plant high plants.
The greenhouse construction with an arched roof is simple, so everyone can cope with its manufacture.
Before you install a polycarbonate greenhouse, you need to build a foundation:
- According to the size of the greenhouse, a trench is dug at a depth of 10-25 cm.
- The bottom is covered with sand (about 1/3 part) and compacted.
- For the base used brick, concrete with formwork or installed ready-made box of wooden beams, treated with antiseptic.
- The remaining space in the trench is covered with gravel and compacted.
At the last stage is the installation of the frame of the greenhouse. As fasteners used long metal pins or screws.
Location of the greenhouse on the site
Before you install the foundation, you should choose the location of the mini-greenhouse polycarbonate. The structure must be in such a position that the sun is present throughout the day. If the site is small, and to find such a place is difficult, then it is worthwhile to roughly arrange the structure and the beds in the greenhouse from west to east.
Advantages and disadvantages
Garden mini-greenhouse seek to acquire with the sole purpose - to provide the best conditions for growing plants. Such a simple structure helps to get an early harvest, and also not in season to serve vegetables and berries. When using cellular material, structures have a number of undeniable advantages:
- Inside it is well kept warm;
- There is a sufficient flow of light;
- Durable lining can withstand heavy loads caused by snow drifts, as well as blows from small hail;
- High esthetics;
- Efficiency and practicality when using a certain area for planting and seedlings;
- Ease of maintenance.
- The small parameters allowing to mount on small sites;
- Simple installation - one person can handle.
Of the disadvantages, you can select only a short service life, which is completely dependent on the proper installation. If the fixings of cellular sheets and the requirements for the installation of the structure are not violated, then there will be no flaws, and the light construction will last for a dozen years. Knowing how to make a greenhouse from polycarbonate, it will be possible to grow early varieties of vegetables, dill, parsley, lettuce, lettuce, sorrel, onions on the beds hidden from the weather. When installed inside a trellis structure, early strawberries and strawberries can be obtained. The optimal dimensions of the structure are from 200 to 300 cm in length - single-slope, from 150 to 400 cm - dual-slope.