Greenhouse Films: Stretching It

Stretching It

While polyethylene film may last a lifetime in the landfill, the time it spends housing your plants isn’t nearly as impressive. Traditionally, most long-life greenhouse films are guaranteed for four years.

“What growers are trying to do is stretch it,” says Nick Calabro, Northeast regional sales manager for Klerks Hyplast, Inc. “Growers are going an additional year, getting five or six years with the film before replacing it.”

At What Cost?
It’s important to remember a few things if you decide to go this cost-effective route.

One, dirt build up can be detrimental. Each year the film is on the structure, it can lose up to 2 percent of its light transmission. For those growers utilizing a top layer and an interior layer to improve heat retention, Calabro says four surfaces are now susceptible to dirt. This build up can be a result of a number of things: pesticides, exhaust, outside air particles, fogging applications and other factors. “After four years, you could be looking at an 8 percent loss in light transmission.” With anything over a 5 percent loss, changes in crop response are visible.

“For bedding crops, I’ve had people say to me, ‘I changed the film out and the following fall, the next crop I grew was a great crop,'” recounts Calabro. “They noticed that it finished quicker and more evenly.”

Holes and tears can also wreak havoc with a film’s effectiveness. Calabro insists on patching every hole and tear with clear, greenhouse tape and patches, especially with double layer installations that depend on constant inflation. “Never scrimp on tape,” he says.

“When it’s not inflated, the film will beat on frame members, which can cause the film to rip.” Calabro notes that repair tape can last about 18 months, with its adhesiveness tending to give way first.

In most cases, stretching greenhouse film into an extra year is done by necessity. “Film is like a balloon,” he says. “The more you stretch it, the thinner it gets, making it easier to puncture.”

New film is very elastic. “When pulled, every inch of film ought to get 500 percent elongation,” Calabro says. After four years, that stretch will only go about 50 percent.

Also, film durability can depend on region. For example, Florida generally sees higher temperatures and more sun compared to northern states. This exposure can lead to quicker degradation. With cooler, cloudier days in the north, some growers can get seven to eight years out of their greenhouse film.

What Are My Options?
Going from a single layer to a double layer of greenhouse film can provide a heat savings of almost 50 percent. To save an additional 15 to 20 percent in nighttime heating expenses, Calabro recommends changing one of your layers into an infrared film. He says infrared films work similarly to the way clouds in the winter trap radiant heat and then radiate it back down to the earth.

Traditional four-year films have only 20 percent light diffusion, while infrared films have more than 50 percent of its light transmission as diffused light. Light diffusion reduces structural shading and produces higher quality light.

This layer is typically placed on the inside, close to the crop, says Calabro, because most infrared films on the market are also drip control films. With poor ventilation and humidity, water can coalesce and form droplets. These droplets can fall onto the crop and soak into the soil. The drip control additive incorporated in this film can prevent condensation, saturated soils and foliar disease.

“Instead of having water form into droplets,” Calabro says, “the drip control film is going to sheet the water into thin layers that will flow down to the gutter or to the ground.” Also, water droplets can act as a prism, and when hit by light, up to 10 percent of the light transmission can be reflected back out of the greenhouse.

Thermic film is another plastic that can help reduce the heat trapped in a greenhouse during the daylight hours. This is done by blocking ultraviolet light and a portion of the sun’s infrared heat.

“Normally photosynthesis shuts down when internal leaf temperatures reach 85 degrees,” Calabro says. So a cooler environment not only benefit the employees, but also increase plant production up to 15 percent. He wouldn’t recommend thermic films for growing bedding crops in the northeast. “They’re normally used with high light in the summer.”

Leave a Reply

More From Greenhouses...
More and more people are employing a landscape service, but that doesn’t mean they don’t still garden

September 2, 2015

Under Siege? Not Really, Just Go For A Walk

I have no trouble with people buying chocolates or wine instead of flowers to celebrate anniversaries, birthdays or peoples’ lives. We should all have choices. However, the other night I felt like I was entering the Republican caucus. I was minding my own business by the television set and became more than a little upset. A website called insteadofflowers.com came on the screen. It provided serene music and wholesome images of busy women doing busy things. It turns out that such busy women enjoy a small token of appreciation, but apparently their enjoyment, according to the voice-over, does not include flowers. This website delivers meals to the house, anything from beef brisket to beef bourguignon. It is a fine website with a good idea. But why pick on us? Why not use “insteadofbaloneysandwiches.com” or “insteadofgrilledcheeseandsoup.com,” “insteadofburgerdoodle.com,” or a dozen other things. When did flowers get to be the whipping boy? […]

Read More
Triathlon BA container shot

September 2, 2015

OHP Launches Triathlon BA, Offers Marengo SC In Smaller Size

Triathlon BA biofungicide/bactericide is now available to authorized OHP distributors for shipment to states where product registration has been approved. State registration information is available here. A next generation preventive biological fungicide, bactercide Triathlon BA is labeled for use in both organic and conventional production on a wide variety of fungal and bacterial diseases on ornamentals, fruits, vegetables and herbs and spices. With the active ingredient Bacillus amyloliquefaciens, Triathlon BA provides preventive control of many foliar and soil-borne diseases such as botrytis, powdery mildew, downy mildew, rusts, leaf spots, alternaria, pythium, phytophthora, rhizoctonia, fusarium and bacterial spot. Triathlon BA, an aqueous suspension formulation, prevents establishment of disease-causing fungi and bacteria on the plant tissues. Depending on the target disease, users can foliar-apply or soil drench Triathlon BA. Repeat applications may be made at three- to 28-day intervals. Under environmental conditions that are conducive to disease development, users may apply at three- to […]

Read More

September 2, 2015

Delegation Is Key To A Successful Greenhouse Operation

In a packed room at Cultivate’15, speaker Bernie Erven presented key steps growers need to take to improve their delegation skills, the benefits of delegating and the dangers of not learning how to delegate. This is a skill, he says, that everyone needs to learn. “For all of you who are part of a family business, you are choosing not to do things the easy way,” Erven laughed, as he presented a list of ways to know whether or not you’re an effective delegator. The owner of Erven HR Services, LLC, Erven has been working with and observing family businesses for many years. In his presentation, he said, he didn’t share anything that he hasn’t seen first-hand. You might not be a good delegator if you: Tend to be a perfectionist Work more hours than anyone else Lack time to explain clearly and concisely Are often interrupted Enjoy what you used to […]

Read More
Latest Stories

June 21, 2015

Greenhouse Project Moves Pavlodar (Kazakhstan) Closer T…

Despite regional challenges, greenhouse specialists Dalsem and automation supplier Hoogendoorn have collaborated on a greenhouse complex with the PTK company to bring Pavlodar (Kazakhstan) closer to self-sufficient, local food production.

Read More
Greenhouse Electrical System

May 26, 2015

Don’t Let Your Greenhouse Electrical System Come …

Ensuring your greenhouse has enough electricity to operate all the equipment that is installed takes planning and consideration of an operation's needs. Part one of two articles on greenhouse electrical systems covers choosing an electrician, meeting immediate and future needs and planning for back-up power.

Read More

May 22, 2015

Nexus Greenhouses Is Optimistic For Expansion Into New …

Cheryl Longtin and Mike Porter, who own Nexus Corporation, say they were excited to attend the grand opening of Gotham Greens’ new structure atop the new Whole Foods grocery store in the Gowanus neighborhood in Brooklyn, N.Y., when it opened in December 2013. The project is just one example of some of the new and expanding markets that Nexus Corporation has expanded into over the past few years. Jeff Warschauer, vice president of sales for Nexus, says the company has enjoyed getting to know and working with the founders of Gotham Greens, Viraj Puri and Eric Haley, and Jennifer Nelkin Frymark, the chief agriculture officer, on their innovative approach to business. “They are very excited and work hard internally – just great people,” he says. “From our perspective, it’s great to see that excitement and vision. The employees there are happy and there’s no turnover; they’re only adding new people […]

Read More
Hendriks-Half-Open-Roof_GGS

March 26, 2015

10 Greenhouse Products For First-Rate Growing Environme…

From coverings to fork-lifts, greenhouse suppliers offer a variety of products to make growing easier. Check out the slideshow to learn more about these, plus several other products that can offer you value, versatility and durability.

Read More

March 16, 2015

Cozy Acres Greenhouses: Operating With Zero Emissions

With the help of federal funding, Cozy Acres Greenhouses was able to take a greener approach to its latest expansion, building a zero emissions greenhouse that operates year round.

Read More
interior view EDDG vent_energy efficiency codes

March 16, 2015

Stricter Energy Codes May Impact Your Ability To Expan…

Energy efficiency building codes that greenhouses are required to meet could soon be much more stringent, unless the National Greenhouse Manufacturers Association is successful in its bid to gain exceptions on greenhouse owners’ behalf.

Read More
NorthCreekGreenhouse_midmarch15

March 13, 2015

GGS Helps North Creek Nurseries Take Efficiency To A Ne…

North Creek Nurseries recently built a new GGS gutter connected poly greenhouse range with the intent of saving energy and implementing Lean Flow Practices. The aim was to help North Creek improve the quality of products and meet increased customer demand, while at the same time saving money on labor.

Read More
Retail Greenhouse

March 12, 2015

The Right Greenhouse For Any Grower

Selecting the right structure for your operation can be difficult. With so many options, it’s easy to feel overwhelmed. The good news is that greenhouse manufacturers are experienced in the art of matching customers with the ideal product. Here’s their advice for how to pick your next structure.

Read More
Fall Creek Farm and Nursery Expansion

March 12, 2015

Conley’s Helps Fall Creek Farm And Nursery Increase Blu…

In order to meet its customer’s increasing demands for domestic blueberry production in the United States, Fall Creek Farm and Nursery needed much more indoor growing space. The company selected Conley’s for a recent expansion of Conley’s Gable Series 7500 in a two-phase project. The first 14-greenhouse range sold by distributor Horticulture Services, measures 170,000 square feet in size and finished construction in 2013.

Read More
Emerald Coast Grower's Atlas Greenhouse

March 12, 2015

Emerald Coast Growers Steps-Up Production Efficiency An…

Emerald Coast Growers, a supplier of perennial starter plants and ornamental grass liners, is not averse to expansion projects. In 2010, it celebrated its 20th anniversary with an expansion of its perennial production space. More recently, the company has been in a nearly continuous phase of construction and improvement projects.

Read More
ArmstrongGrowers Hanging Basket Area

March 12, 2015

Armstrong Growers And Pike Farms Grow With Sustainable …

Rebuilding and retrofitting greenhouses has been key to Armstrong Growers’ expansion on the West Coast, and Pike Farms will follow the same business model on the East Coast. The four-acre wholesale operation that is currently Pike Farms produces only about 5 percent at the most of Pike Nurseries’ retail garden center needs; however, that’s going to change in the next couple of years.

Read More
Metrolina Greenhouses Loading-Dock

March 12, 2015

Metrolina Greenhouses Expands With High- And Low-Tech …

Heralded as one of the most automated greenhouse operations in the U.S., Metrolina Greenhouses continues to build in Huntersville, N.C., and York, S.C. Art Van Wingerden, chief operating officer and co-owner of Metrolina Greenhouses, estimates that as his big box customers continue to grow at a 3 to 5 percent rate, so will Metrolina Greenhouses’ growing facilities to keep up with demand.

Read More
GrowCo_greenhouses

March 10, 2015

Greenhouses Are More Efficient For Marijuana Production

At least 30 percent more efficient and productive than warehouse growing, greenhouses are the way of the future for commercial cannabis production, experts say. Cannabis growers and advisors are starting to move production out of the warehouse and into the greenhouse, to benefit from the efficiencies that the sun’s natural light and environmental controls provide.

Read More
Pleasant View Gardens New Expansion

March 10, 2015

Pleasant View Gardens Transitions Old-School Hoop Hous…

A new production expansion optimizes labor efficiency and adds growing space, while optimizing energy use.

Read More
Rough Brothers aeroponic greenhouse project

February 24, 2015

Rough Brothers Takes A Hands-On Approach To Several Pro…

Two projects Rough Brothers worked on for Altman plants in Giddings, Texas, and Scissortail Farms in Tulsa County, Okla., show that pre-planning on the grower's part opens the way for a smooth-running expansion project.

Read More
Stuppy Greenhouse Manufacturing's Rainbow Super Structure

February 23, 2015

Stuppy Greenhouse Manufacturing Says Every Customer’s G…

Well-suited greenhouses that function efficiently for customers arise from involving them in the design process from start to finish. Stuppy Greenhouse Manufacturing put this philosophy on a greenhouse design for a wholesale grower looking to expand his annuals operation. The grower's needs were simple, yet daunting: design a greenhouse that delivers the perfect growing environment, but keep maintenance and operating costs low.

Read More
National Greenhouse Manufacturers Association

January 27, 2015

Stricter Energy Codes May Impact Your Ability To Expand

Are you aware stricter energy codes may be on the horizon that will certainly impact your business in a big way? Here's a Q & A from the National Greenhouse Manufacturers Association that helps explain the dangers of the coming energy codes and what we as an industry can do to prevent them.

Read More

January 27, 2015

10 Questions To Ask Before Purchasing A Greenhouse Cove…

Whether you’re replacing an existing greenhouse covering or building a new greenhouse, it’s a significant investment, so you need to make sure you have the right type of covering to suit your needs and budget. What’s more, with production costs on the rise, you can’t afford to have anything less than a durable, high-quality covering that is energy efficient. To make a smart purchase, do your homework before you buy. A good place to start is by answering the following questions, which will help you separate the good products from the mediocre ones.

Read More