Northern Polytunnels

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Polytunnel Covers

Although all our Polytunnel Covers come with a 5-year guarantee as standard, ​you'll find that with a just a little bit of care, you can seriously extend their lifespan way beyond the 5-years. We've heard of our covers lasting up to 14-years, but it is inevitable that eventually, a replacement polytunnel cover will become a necessity.

But which Polytunnel cover should you choose? Northern Polytunnels are here to help, just read on, or if you know what you want and you're ready to buy:

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 Wondering how much Polytunnel cover you need? Use our handy Polytunnel calculator

 

Polytunnel cover

 

The Different Properties Explained

Diffusion: Think of the diffusion properties of polythene as clouds in the sky. Diffused polythene scatters the light as it passes through it, allowing it to hit the plants from a range of angles. This ensures your plants will get an even amount of light and not grow towards any particular light source, thus avoiding one plant overshadowing another. Even clear films have a small level of diffusion.

Thermic Effect: This is similar to your loft insulation. The heat that builds up during the day is lost at night. The higher the thermic value of the polythene the slower the heat loss is.

Thickness: The thickness of the polythene does not relate to how strong the polythene is or how long it will last, our polythenes have additives (IR, UVI and EVA) that take care of all that but it’s important to bear in mind:

  • Too thick and it will be difficult to fit and get the tightness.
  • Too thin and you run the risk of damage.

Light Transmission: This is the amount of light that passes through the polythene:

  • Too much direct light can be detrimental to some crops.
  • Too little can hinder growth.

5 Year Guarantee:

All our polytunnel covers come with a 5-year guarantee. 

Our Polytunnel Covers

 

Lumisol Clear

Lumisol Clear is a UV ’open’ polythene film, allowing UV light to reach your plants. This can have many benefits for both edible and ornamental crops, such as enhancing the fragrance, taste, colour, earlier harvesting and longer post-harvest shelf life. In addition, UV open films promote plant anti-oxidants which are good for plant health and encourage stronger plants.

polytunnel cover lumisol clear

Due to its clarity, clear polythene allows around 2% more light to enter your polytunnel than with a diffused polythene cover. This extra light brings extra heat which can be a benefit during the early and late months of the growing season. Especially popular in northern and western regions where lower light levels naturally occur.

Light transmission: Up to 92%
Thickness: 720 gauge
Thermic effect: Over 80%
Diffusion: Less than 35%

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Lumisol Diffused

Light-diffusing polythene films scatter the light as it passes through the polythene. This enables the light to penetrate deep in to the plant canopy, as it hits the plant from all directions, not just from the direction of the sun. This ‘diffused’ light reduces the higher foliage from shading the lower parts of the plant.

Lumisol diffused polytunnel cover

Lumisol Diffused is a UV ’open’ polythene film, allowing UV light to reach your plants. This can have many benefits for both edible and ornamental crops. Thanks to it's unique anti-condensation additive, Lumisol Diffused is able to control condensation on the underside of the film.

Light transmission: Up to 90%
Thickness: 720 gauge
Thermic effect: Over 80%
Diffusion: 90% 

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Green/White Polythene (Blackout

Green & white polythene is especially formulated to meet the needs of the mushroom grower. The green outer layer helps this cover blend in with the environment, whilst the white layer reflects internal lighting to provide a pleasant working environment. A black core layer ensures complete opacity (black-out) and contributes to the durability of the film.

Green white polythene polytunnel covers

Light transmission: Up to 0%
Thickness: 800 gauge
Thermic effect: N/A
Diffusion: N/A

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White UVI Polythene

White UVI polythene produces shade and reduces daytime temperatures, allowing 60-70% light transmission. A thermic film developed to help keep the growing environment warmer by reducing the heat lost through long wavelength infra-red radiation. Higher overnight temperatures encourage plant growth, can reduce plant losses and allow savings to be made on heating.

White UVI polytunnel covers

White UVI polythene produces shade and reduces daytime temperatures, allowing 60-70% light transmission.

Light transmission: 67% - 68%
Thickness: 720 gauge
Thermic effect: 55%
Diffusion: 32% - 33%

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Full Net Covers

Our in-house fabrication department can produce net covers to any size. Our standard shade net covers are dark green with a 40%-45% shade value, but heavier shade values can be catered for. Our production method spaces the seams between 2m-3m apart (depending on the size), with the seams running parallel with the hoops (width-ways).

full net polytunnel covers

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Polytunnel Cover Calculator

 

A - Height of Polytunnel B - Distance over the hoop C - Length of Polytunnel
Polytunnel

Start Calculating

How are you attaching the polythene to your Polytunnel?

Measurement In Metres...
  • A - Height
    (Height of Polytunnel)
  • B - Distance
    (Distance over the hoop)
  • C - Length
    (Length of Polytunnel)
  • Measurement In Feet...
  • A - Height
    (Height of Polytunnel)
  • B - Distance
    (Distance over the hoop)
  • C - Length
    (Length of Polytunnel)
  • Covers Available in

    Need help choosing which cover option? Click the icons below for info.
    Lumisol Diffused
    Luminal Clear
    Opaque White
    Green & White
    LUX

     

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