Shading Systems for Polycarbonate Greenhouses

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So what is a Shading System? Simply put, it is the most effective way to stop the heat before it reaches your Greenhouse, unlike conventional shade net which is fitted to the inside of a greenhouse. It will reflect heat in summer and can also be used to retain heat in the winter. 
Our clever system also allows the Auto Vent Openers to operate without any interference as they are free to expand or contract depending on the inside temperature.

 Is Greenhouse Shading Necessary? In many parts of Australia, cooling a greenhouse can be a greater problem than heating it! Keeping the greenhouse cool is accomplished by obtaining a balance of shading, ventilation and humidity. Providing the proper amount of each is the secret to a cool and functional greenhouse.
The most popular method that we personally recommend is shading as it's the cheapest and most effective way of controlling greenhouse temperatures during warmer weather. Shading is best done on the outside of the greenhouse over the polycarbonate panels as it helps reduce plant leaf temperature which will inturn reduce burning.

The amount of shade that is required for your greenhouse is not always the same, as it will depend on the season and the plants that are growing within the greenhouse. In the months of strongest sunlight, you'd want to aim to have shading that reduces the light by 40-50%. Any higher degree of shading will inhibit growth of your plants due to inadequate light.

Due to the superior reflection abilities and light weight properties of ALUMINET we decided it would be the perfect cloth to cover the outside of a greenhouse instead of using standard shade cloth that often absorbs heat.

What Is Aluminet? It is a special knitted screen made from metalised fibre which gives it durability and longevity. It acts like a mirror as its unique aluminised nature reflects unwanted sunlight and harmful radiant heat from the greenhouse during summer and preserves heat inside the greenhouse during winter.

ALUMINET works as a thermal blanket. All warm objects become cooler by giving off longwave, infrared (heat) radiation. At night, the warm earth surface cools as it gives off infrared radiation. On clear nights, this radiation is lost into space. On cloudy nights, some of this radiation is reflected back to the earth by the clouds, maintaining a warmer temperature than would occur on a clear night (under otherwise similar conditions). Within the greenhouse, this same process is going on. The plants and floor give off invisible heat radiation at night.

ALUMINET, when installed as a thermal blanket/shade cloth, reflects this radiation back to the plants maintaining warmer leaf temperatures. This decreases condensation on the leaves as well as helps to maintain warmer air temperature within the canopy. Because the net is open weave, air does pass through the net. While this tempers the thermal benefits to some degree (compared to a solid screen), this has distinct advantages, particularly with naturally ventilated houses. First, the open weave of ALUMINET allows better movement of hot air to roof vents when used as shade during the day, and second, it allows moisture to pass through to the peak of the house, maintaining lower humidity near the plants.
With any shading kit it is essential to have an air gap between the greenhouse and shading material, this prevents any heat being trapped in the shade cloth.


Happy greenhouse gardening!


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