Ethan Clarke
There are several ways to join greenhouse plastic together. Polyethylene is a popular option for those building their own greenhouses due to its affordability, energy efficiency, and ease of installation. Before joining greenhouse plastic together, it is important to prepare the frame by sanding or painting it to create a smooth surface and avoid damage to the plastic film. The four primary ways to join greenhouse plastic are: using single or double Poly Lock Channel and Spring Wire, Snap Clamps, staples, and glue or adhesive tape. Poly Lock Channel and Spring Wire is affordable, durable, and easy to use, while Snap Clamps are ideal for temporary installations. Staples can also be used, but this method may result in heavy panels that require additional structural support. Gluing greenhouse plastic can be challenging due to the lack of molecular bonding points in polyolefins, and velcro strips may not provide a durable solution.
Characteristics and Values:
| Characteristics | Values |
|---|---|
| Materials | Polyolefins, Polyethylene, Polypropylene |
| Joining Methods | Staples, Tape, Glue, Velcro, Wire, Spring Wire, Poly Lock Channel, Double Channel Poly Lock, Snap Clamps, Screws |
| Considerations | Smooth and abrasion-free surface, heat buildup, rust prevention, tautness, weight of panels |
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What You'll Learn
Using channel lock and wiggle wire
Joining greenhouse plastic together can be achieved using channel lock and wiggle wire. This method is also known as using U-channel and spring lock.
Firstly, screw the channel lock to the frame where you want the seam to be. You can purchase a spring lock channel from a greenhouse supply company.
Secondly, overlap the pieces of poly at the point where the channel lock has been screwed into the frame.
Finally, clamp the overlapping poly pieces together using wiggle wire. Wiggle wire is made from stainless steel, aluminium, or galvanised steel. It is designed to attach across the full area of the plastic, creating a thorough covering that keeps air and wind from getting underneath.
Wiggle wire can be purchased in packs of varying sizes, depending on your requirements.
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Staples
Using staples to join greenhouse plastic together is a common method, but it is worth noting that staples alone may not withstand high winds. It is recommended to use staples in conjunction with other materials for a more secure hold.
One method is to use staples with a strip of felt. Place the felt on top of the plastic and staple through both layers into the boards. This provides added protection against strong winds and helps to prevent the staples from tearing out.
Another approach is to staple the plastic to a wooden frame. However, when using staples with a wooden frame, it is important to consider the thickness of the plastic. Thin poly plastic may require an additional layer of a thick material, such as drip tape, as a top cover to reinforce the staples and prevent tearing.
When stapling, it is advisable to have a roll of greenhouse repair tape on hand to fix any small tears that may occur during the installation process. Additionally, consider using staples with vinyl strapping to secure the plastic to the boards, which has been reported to hold up well throughout the season.
For those with cattle panels, one method involves stapling the bottom edges of the plastic into the boards around the bottom edge. Then, screw a strip of 1x2 over the plastic, fold the edge, and staple the plastic to the 1x2. Finally, secure the plastic by tightening nylon or parachute cord over the top with a bungee cord every 2 feet.
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Adhesives and glues
Joining greenhouse plastic together with adhesives and glues can be challenging because polyolefins, such as polyethylene (PE) and polypropylene (PP), lack the molecular bonding points to work well with most adhesives. However, there are some special plastic bonding systems and types of glue that can be used to join greenhouse plastic together.
One option is to use a special plastic bonding system, such as LePage Super Glue All Plastics or Loctite Super Glue All Plastics. These systems typically involve a two-step process, with a primer or activator that prepares the surface of the plastic to accept the adhesive, followed by the application of the adhesive itself. These glues dry quickly, often within seconds, and can create a strong, invisible bond.
Another option for joining greenhouse plastic is epoxy, a two-part adhesive that consists of a resin and a hardener. Epoxy is particularly useful when joining plastic to an uneven surface or when the parts do not fit together tightly. It is strong enough to span gaps and fill in surface imperfections, and it can even be drilled or machined once cured. Choose an epoxy formula designed for plastics, such as LePage Epoxy Gel or Loctite Universal Instant Epoxy Liquid 5 Minute, which bonds to a wide range of plastics.
When using any adhesive or glue to join greenhouse plastic, it is important to clean and pre-fit the parts before applying the adhesive. This may involve using an activator or primer to prepare the surface of the plastic. Always allow the glue to fully cure before using the joined plastic, as this will ensure a strong and durable bond.
While super glue is a common adhesive for plastic, it is important to note that it may not work on certain types of plastic, such as polyethylene (PE) and polypropylene (PP). Always check the label to ensure that the super glue is compatible with the type of plastic you are joining. Additionally, be sure to clean up any excess wet adhesive immediately with a damp cloth or paper towel, as dried adhesive can be difficult to remove.
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Tape
Joining sheets of polyethylene for greenhouse covering requires tape with a glue that is resistant to heating and light. Duct tape can be used to frame the plastic before stapling it to a wooden frame. However, this method may not withstand strong winds.
To overcome this, one can lay a strip of felt on top of the plastic before stapling it to the boards. This method has been known to withstand winds of up to 50 mph. Vinyl strapping can also be used to staple the plastic to the boards and will hold for the entire season.
Another method is to use drip tape, which can also act as decorative trim on the framing lumber. However, this method requires a lot of staples and framing.
A more secure method of joining greenhouse plastic is to use Poly Lock Channel and Spring Wire, also known as "U Channel", "C Channel", "zig zag Wire", or "Wiggle Wire". The channel is secured to the frame, and the plastic is installed into the channel by wiggling the Spring Wire back and forth over the plastic and into the channel. This method forms a tight and secure attachment, making it nearly impossible to pull the plastic out of the channel.
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Sanding and painting the frame
To prepare your greenhouse frame for polyethylene film, you must sand and paint the frame to create a smooth surface and minimise heat buildup.
First, sand the outer portions of the frame with sandpaper. You can purchase sandpaper at your local hardware store or online. Start with a medium-grit sandpaper (around 100-150 grit) to remove any rough areas or imperfections on the frame. Then, switch to a fine-grit sandpaper (200-300 grit) to smooth out the surface even further. Always sand in the direction of the wood grain, if applicable, and be sure to wear a mask and safety goggles to avoid inhaling any dust or debris.
Once the frame is smooth to the touch, you can begin painting. If your frame is already white, you may not need to paint it. However, if it is a different colour, it is best to paint it white to create a reflective surface that minimises heat buildup. Use a water-soluble, white paint designed for outdoor use. Apply two coats of paint, allowing the first coat to dry completely before applying the second. Follow the instructions on your paint can for the best results.
If your frame is made of metal, you may want to consider using a primer before painting to help the paint adhere better and prevent rust. Choose a primer that is suitable for metal surfaces and follow the instructions on the product.
For a wooden frame, you can also apply a clear sealant after painting to provide additional protection against the elements. Again, be sure to follow the instructions on your chosen product for proper application.
By properly sanding and painting your greenhouse frame, you will create a smooth and reflective surface that is optimal for attaching polyethylene film and will help extend the life of your greenhouse.
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Frequently asked questions
The best method to join greenhouse plastic is Poly Lock Channel and Spring Wire. It is affordable, durable, and easy to use.
Other methods to join greenhouse plastic include using staples, glue, velcro, or tape.
Most glues are not suitable for joining greenhouse plastic as they are designed for polyethylene or polypropylene. However, some glues that work with greenhouse plastic include those that are resistant to heating and light.
The frame must be smooth and without abrasions that could damage the plastic film. Sand the outer portions of the frame or attach white tape foam to create a smooth surface. Paint dark-colored frames with a white, water-soluble paint to minimise heat buildup and protect the plastic from degradation.
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