Greenhouse Film:

Greenhouse film with ultraviolet (UV) protection is the least expensive of the Glazing Materials.

It is the glazing that we use for our Greenhouses. Hoop housesare a cheap and easy way to build a greenhouse.

The polyethylene, an unbreakable, long lasting and easy to replace cover, provides the high light transmission for the plants with increased safety (won’t shatter or break) and insulation value.

Poly Greenhouses keep the insects and pests away, let’s the sun’s rays in, and traps the heat.

Polyethylene film is available with life expectancy of one to four years depending whether it has been UV protected.

And if it a true Greenhouse Film, and not the platic that can be purchased from the local hardware store than it has been UV treated.

Poly is also very light in weight, and is easy and safe to work with for the Do-it-yourself (DIY) gardener.


Number 1 Choice to cover Greenhouses:

According to the National Greenhouse Manufacturers Association (NGMA) greenhouse film is still the first choice for covering greenhouses, mostly because of its low cost, and ease of use – anyone can cover their own greenhouse with this material.

Air-inflated double-polyethylene film greenhouses, can represent up to 80% of new greenhouse construction in the United States.

In terms of heat conservation, a double layer of poly will reduce heat loss during the winter by 30–40% when compared to glass, therefore lower heating expenses.



Manufacturers are improving Greenhouse film all of the time. Before UV protection was offered in the poly, it didn’t last very long.

With the new Greenhouse Poly offered today, grower’s can get up to four years. More if it is maintained, and shade clothe is used during the peak hot sunny times of summer, for added protection from the UV rays.

As I mentioned, this is my preferred glazing material for ease of installation, versatility and low cost. It is easily replaced as needed and is the least expensive glazing choice.


Attaching Greenhouse Film to the Frame:

There are a number of ways that the poly can be attached to a greenhouse frame. We chose to use poly clip or poly channel to attach the poly covering to our galvanized hoop house. If the ends are rolled they it can also be stapled, or run a strip of 1”x1” wood strip to sandwich the poly to the structure.

The benefit of using poly lock is that it makes it easy to change the poly when it comes time. Take it off, and put the new stuff back on. Quick, easy, and painless.

Poly can cover a number of greenhouse frames: Wood Frame construction or Hoop Tunnels made out of PVC or Galvanized Hoop Tunnels. This glazing is pretty versatile.


Versatility:

Poly can cover a number of greenhouse frames: Wood Frame construction or Hoop Tunnels made out of PVC or Galvanized Hoop Tunnels. This glazing is pretty versatile.

See some different Greenhouse Plan options.


Insulation - Heat Retention:

Air-inflated greenhouse Film surfaces experience roughly 60 percent less of the heat loss compared to a single layer of glass or plastic glazing.

I personally have never tried using the bubble wrap, but I have heard of people using bubble wrap to help insulate their greenhouses during the winter season. Makes sense, the bubbles are filled with air, and would create a great insulating barrier. Could be used in any greenhouse.


Greenhouse Film Pros and Cons:

    Pros:
  • The least expensive way to cover a greenhouse

  • Insulation can be increase by clipping another sheet of poly to the inside walls during the winter months. The air flow between the two poly sheet creates an insulating barrier. Or opt in for to add an air blower to inflate and increase heat retention even more.

  • Very cost effective way to obtain a first greenhouse or for larger or commercial greenhouses and nurseries.

  • Many are tear and puncture resistant

  • Many are UV protected to extend the life of the poly, and saving the leaves of the plants from being burnt.

      Cons:

  • Usually needs to be re-covered every 2-6 years depending on the quality of the poly.



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