Omar Khalid
Insulating a plastic greenhouse can be done in a variety of ways, and is a necessary step if you want to keep growing fruits and vegetables throughout the winter. The simplest method is to use two layers of plastic with a small fan that pushes a continuous flow of air between them, creating a buffer between the interior and the outdoors. Other methods include using twin-wall polycarbonate, which offers one of the most prominent solutions with its thicker, virtually unbreakable material that improves insulation while still providing light diffusion and UV protection. To increase heat retention, horticultural bubble wrap can be used to line the inside of the greenhouse. Additionally, installing a windbreak made of shrubs, small trees, or hazel/willow panels can help prevent icy blasts from making your greenhouse lose heat.
| Characteristics | Values |
|---|---|
| Insulation material | Horticultural bubble wrap, twin-wall polycarbonate, foam board, bubble wrap, Insulfoam, cardboard, styrofoam, plastic bottles, bricks, terracotta flower pots |
| Windbreaks | Shrubs, small trees, windbreak fence mesh, hazel or willow panels |
| Heat sources | Heater, radiator, sun, black objects |
| Other | Seal gaps, cover unused openings, use frost blanket |
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What You'll Learn
Use a twin-wall hard covering for end-walls
Using a twin-wall hard covering for end walls is a great way to insulate your plastic greenhouse. This method is one of the most effective ways to insulate your greenhouse and protect your crops. It is also a long-lasting option that adds significant R-value when compared to single-layer coverings.
The 8mm twin-wall polycarbonate covering is the most widely used option and is installed with an approximate dead air space of 8mm between its front and back. This helps to reduce heat loss through the end walls, which represent a significant square footage of the greenhouse.
To install this type of covering, you can use large-head nails, tec screws, or clips to attach the insulation board to the end walls. This will ensure that your greenhouse is well-insulated and help to retain heat during colder months.
It is important to note that this method requires some technical effort and it is crucial to pay close attention to the base perimeter and door installations to ensure that there are no large gaps or air transfers that can negatively impact your insulation efforts.
By using a twin-wall hard covering for your end walls, you can effectively insulate your plastic greenhouse and create a more favourable environment for your plants to thrive during the colder seasons.
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Seal the base to reduce air transfer
Sealing the base of your greenhouse is an important step in reducing air transfer and improving heat retention. Here are some ways to do this:
Firstly, identify any gaps or cracks in the structure that could be allowing cold air to enter and warm air to escape. Pay particular attention to doors and vents, as these are common areas of heat loss and air transfer. Look for any small cracks or components that may not have insulation properties, such as aluminium shutters.
Once identified, use weather stripping or caulk to seal these gaps. For larger openings that are not in use, such as end-wall vents, consider covering them with scrap greenhouse plastic to create a barrier against air transfer.
Another way to seal the base and improve insulation is by using twin-wall polycarbonate cladding. This involves installing two layers of polycarbonate with an air pocket in between, which helps trap air and prevents heat from escaping. The thickness of the polycarbonate can vary, with 8mm providing the highest degree of insulation.
Additionally, you can improve heat retention by adding thermal mass to the base of your greenhouse. This can be done by using bricks or paving tiles, which absorb heat during the day and release it at night. Painting these materials black can further increase their heat absorption and retention capabilities.
By following these steps to seal the base and improve insulation, you can effectively reduce air transfer and create a warmer environment for your plants.
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Use a frost blanket above crops
Frost blankets are an excellent way to protect your crops from frost and pests. They are made of lightweight, 100% polypropylene fabric, which is breathable and quick-drying, preventing moisture buildup. This material is designed to create a barrier that retains heat from the soil around the plants.
Frost blankets can be used in a variety of ways. They can be installed on row crops with low-tunnel hoops or laid directly on the plants for protection. When used without hoops, they are called floating row covers as they \"float\" above the plants, only resting on the tips of the leaves. You can anchor them with landscape fabric pins, rocks, or sandbags.
It is important to note that frost blankets should be removed when the temperature rises above 50 degrees Fahrenheit, as this can create too much heat for the plants underneath. If you are using plastic, be cautious as the temperature difference is higher, and crops touching plastic can be damaged.
Frost blankets are a versatile option, offering opportunities for season extension with minimal infrastructure. They can be used to cover late fall crops before frost and protect crops and newly transplanted seedlings from early spring frosts.
Overall, frost blankets are a great tool to have on hand, especially if you live in an area with distinct seasons or changing climate patterns. They provide effective protection for your crops and help extend the growing season.
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Install windbreaks outside
Installing windbreaks outside your plastic greenhouse is an effective way to protect it from wind damage. Here are some detailed instructions to help you with the process:
Firstly, assess the location of your greenhouse. If possible, place it near a natural windbreak such as a garden wall, fence, hedge, or trees. Natural windbreaks can significantly reduce wind speeds and provide protection for your greenhouse. Ensure that any trees or branches are not too close, to avoid any potential damage from falling debris.
If there are no natural windbreaks available, you can erect artificial windbreaks. Avoid solid plastic or wood panels, as they can create turbulence if the windbreak is too dense. Instead, opt for mesh windbreak fence panels, or hazel or willow panels for a more natural look. These barriers should be strategically placed to block wind without obstructing sunlight from entering the greenhouse.
Additionally, you can reinforce the structure of your greenhouse by adding extra supports. Cross bracing, for example, involves installing diagonal bars across the frame to increase stability. You can also use ropes or bungee cords to secure the structure, connecting the top crossbeam to the base. This provides external tension and holds the frame together, making it more robust against strong winds.
Remember to regularly inspect your greenhouse for any signs of damage, especially after extreme weather conditions. Patch up any holes or tears in the plastic cover with duct tape or gorilla tape to prevent further damage and reduce stress on the cover.
By following these steps, you can effectively install windbreaks and protect your plastic greenhouse from potential wind damage.
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Line the inside with bubble wrap
Line the inside of your plastic greenhouse with horticultural bubble wrap to increase heat retention without compromising light transmission. Bubble wrap is a popular option for all types of growers, including those who use a high tunnel, cold frame, or unheated greenhouse.
To start, measure the height and width of your greenhouse walls to determine the amount of bubble wrap you will need. You can attach the bubble wrap to the inside frame of your greenhouse using channel clips. Ensure that the bubble wrap is pulled taut and secure.
When selecting a type of bubble wrap, consider using a clear variety, such as TekFoil Clear Bubble Insulation, which is compatible with all types of cladding and can be left up year-round. This makes it easy to transition from winter to warmer weather.
Bubble wrap is an economical and effective way to insulate your plastic greenhouse, helping to trap the warmth generated by your heating system and the heat absorbed from the sun.
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Frequently asked questions
You can use horticultural bubble wrap to line the inside of your plastic greenhouse. Alternatively, you can use twin-wall polycarbonate, which offers one of the most prominent solutions to improving insulation.
Shrubs and small trees act as natural windbreakers and can prevent snow drifts. You can also use hazel or willow panels for a more natural look.
Plastic bottles and jugs filled with water make excellent heat sinks. Place them near the north-facing wall of your greenhouse so that the sun warms the water during the day, and they act as heaters after sundown. You can also use bricks or black terracotta flower pots, which absorb and retain heat well.
You can use scrap greenhouse plastic to cover any end-wall openings that are not in use. You can also seal the base of your structure to reduce air transfer.
