There are many benefits to polyfilm greenhouses. One thing is that some municipalities will consider this a temporary structure and will not require permits, wind and snow load ratings, etc. They are also less expensive than a rigid polycarbonate covered greenhouse. One disadvantage to this is that most of the greenhouse polyfilm found today has a 4 year UV protection, so you will have to figure on replacing the covering every so often. Double polyfilm greenhouses consist of 2 layers of polyfilm with an air inflation system for greenhouse film blowing air between the 2 layers. This will give you a much better R rating than just a single layer of film. Manufacturers claim that it can save you up to 40% of your energy costs. That is quite a considerable savings. I find that the inflated film is more rigid and less susceptible to damage than a single layer of film. This all happens without lowering the light transmission properties of the polyfilm. This is an excellent choice that has been used by many commercial growers through the years and is totally acceptable for a backyard greenhouse operation. Be sure to use greenhouse polyfilm that is UV protected and has an anti condensate coating on it. If the film is not UV protected you should not expect to get any more than one years use out of it, sometimes even less. The anti condensate coating keeps droplets from forming on the film. This will contribute to the overall health of your plants. Any condensation that does form on the roof will come off in sheets rather than in droplets. If you have water dripping on your plants you will have damage to your leaves, fruits, flowers and overall less healthy plants. So, when considering your first or next greenhouse, take a look at a double polyfilm greenhouse and see what benefits it will give you.
We are happy to announce the newest product addition to our greenhouse glazing line. This covering is a vinyl material that has a crystal clear, glass like clarity. It is great for commercial operations that would benefit from the customers being able to see clearly inside the greenhouse. Every fall it seems that I get a couple of calls from people wanting to “seal up” their screened in back porches for the winter. But, they do not want the semi transparency of our 6 mil, 4 year polyfilm. This is a perfect covering for this purpose. It is a tough, durable 16 mil covering. Of course all of the greenhouse glazing materials we offer have UV protection. The life expectancy of this material is 4 years. It comes in 54″ widths and 3 different lengths of rolls.
Building a Polyfilm Greenhouse? Not sure how to attach the film to your greenhouse frame? This video discusses the use of batten tape or base and wiggle wire systems. They are both excellent for wood frames. The wiggle wire system is good for metal frames as well. As always, we hope you find this edition of “The Greenhouse Minute” informative and helpful.