
Corrugated plastic sheets are a versatile material with a wide range of applications. They are lightweight, strong, and durable, making them an excellent choice for roofing, decking, and even windows. One innovative use for corrugated plastic sheets is as a heat-blocking solution for windows. By placing the sheets outside the window but inside the screen, the sun's heat is blocked before it passes through the glass, keeping the room cooler and reducing the need for air conditioning. This simple and frugal solution can be easily customized to fit most windows and can be made to look unobtrusive. For those with green thumbs, corrugated plastic sheets are also a popular choice for greenhouses, where they allow filtered light through while protecting plants from the elements.
| Characteristics | Values |
|---|---|
| Ease of installation | Corrugated plastic is easier to install than double-wall polycarbonate. It can be cut to size with scissors or tin snips, while double-wall polycarbonate needs to be cut to size and taped, and assembled with H-channels. |
| Insulation | Corrugated plastic can provide insulation, blocking heat and sunlight. For example, it can be used outside windows to prevent solar heat from entering a room. |
| Durability | Corrugated plastic is durable, rot-proof, waterproof, and resistant to ordinary cleaning solutions. |
| Light transmission | Corrugated plastic allows light transmission while diffusing light and providing shade. |
| UV resistance | Polycarbonate corrugated plastic panels have UV resistance on one side, which should be installed facing the sun or exterior of the structure. |
| Ventilation | When using corrugated plastic for roofing or greenhouses, consider installing fans for ventilation. |
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What You'll Learn

Cutting corrugated plastic
For thin corrugated plastic sheets, a sharp pair of scissors is an effective option for cutting. However, scissors are not suitable for sheets thicker than 4mm as they will require multiple passes, resulting in an unclean cut. Tin snips can also be used for thin sheets. For thicker sheets, a utility knife is a better option as it can handle both thick and thin sheets and will achieve a smooth and clean cut. When using a utility knife, cut halfway through the sheet first, then keep tracing the outline until the board cuts through completely. This will ensure a precise, smooth, and safe cut.
Other tools that can be used for cutting corrugated plastic include an angle grinder, circular saw, hand saw, jigsaw, Dremel, sawzall, and oscillating multi-tool. For professionals, an automatic flatbed cutter is recommended as it can cut out complex designs accurately and automatically, although these machines are expensive. Before cutting, always examine the sides of the corrugated plastic board and align your cuts with the little squares along the edges to achieve a smooth and neat result.
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Installation
Corrugated plastic panels can be used as a cost-effective way to block heat from entering a building through its windows. They can be installed outside the windows but inside the window screen.
To install corrugated plastic panels, follow these steps:
Firstly, source your panels. You can buy these from a hardware store, or you can reuse corrugated plastic signs, such as those used for political campaigns. If you are buying new panels, you can cut them to size with scissors or tin snips.
Secondly, ensure you have the correct safety equipment. Corrugated panels are made of a mat of high-strength glass fibres embedded in organic resin, so you should apply a barrier cream to exposed skin areas before working with the panels to avoid skin irritation.
Thirdly, plan your installation. Find a spot that will give your window maximum coverage. Remember to check your local building code to ensure your installation complies with any relevant regulations.
Next, install the panels. You can use ordinary tools to drill, saw, punch, or nail the panels without causing damage. Pre-drill holes and fasten the side panels with aluminium nails and neoprene washers. Apply mastic to the overlap of one corrugation. Overlap roof panels and nail them to rafters, starting from one end. You should overlap the panels in the direction away from the prevailing wind.
Finally, finish the installation by nailing trim lumber to all corners and to the front and back where the panels meet the roof. Fasten aluminium ridge roll flashing to each panel as you go.
By following these steps, you can effectively install corrugated plastic panels to block heat from entering your home or office.
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Insulation
Another option for improving the insulation of double-pane windows is to use plastic film window insulation. This can be done by installing curtain rods at the top and bottom of the window and running a loop of plastic sheet around them, with the plastic sheet positioned about half an inch away from the window pane for optimal insulation. Alternatively, a wooden rectangle can be built to fit into the window frame and covered on both sides with a plastic sheet. This interior window insulating panel can be installed and removed as needed and provides an additional barrier to heat loss.
It is worth noting that while plastic film window insulation can help, it may not be necessary for well-sealed modern double-pane windows. The contribution of the plastic to insulation may be minimal, and it is more important to ensure that the window is properly sealed and that there are no gaps or drafts. Additionally, the use of plastic film may reduce the amount of light entering the room.
For those living in colder climates, it is recommended to focus on other areas of the home that may be prone to air infiltration, such as electric outlets, bath fans, door weatherstripping, and air duct leaks. Properly sealing these areas can have a more significant impact on the overall insulation of the home.
In summary, while corrugated plastic panels and plastic film window insulation can improve the insulation of double-pane windows, it is important to consider the specific needs of your home and climate, as well as the potential trade-offs between insulation and light transmission.
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Reusing corrugated plastic
Corrugated plastic is a versatile material that can be reused in many creative ways. Its unique properties, including durability, lightweight rigidity, and heat resistance, make it an excellent option for a variety of projects and applications. Here are some ideas and suggestions for reusing corrugated plastic:
Heat Blocking Panels
Corrugated plastic panels can be placed outside windows, providing an effective barrier against solar heat. This simple hack involves placing the corrugated plastic sheets outside the window but inside the window screen, with the white side facing outward. This helps block the sun's heat before it passes through the glass, reducing the temperature inside the room and lowering power bills. This method is particularly useful for windows that receive intense direct sunlight during the summer months.
Greenhouse Construction
Corrugated plastic is an ideal material for building greenhouses due to its ease of installation and ability to maintain a suitable temperature. Its lightweight yet sturdy construction makes it a preferred choice over double-wall polycarbonate panels. With corrugated plastic, you can simply cut it to size with scissors or tin snips and overlap the pieces for a quick assembly. Additionally, corrugated plastic's durability and heat resistance contribute to its effectiveness in greenhouse construction.
Crafting and DIY Projects
Corrugated plastic, often sourced from leftover political or yard signs, can be reused for various crafting and DIY projects. Its stiffness and rigidity make it suitable for creating separators or dividers to organise and protect items in storage cases. It can also be sewn into fabric to add structure, as seen in a Reddit user's innovative project involving a yoga mat and stainless nails to create a hardcase system.
Custom Printing and Signage
Local sign or print shops offer custom printing services on corrugated plastic sheets, also known as Coroplast. They can provide a range of thickness options to suit different needs. This is a great way to reuse corrugated plastic for signage, whether for practical purposes or decorative displays.
Recycling
Beyond reuse, corrugated plastic is highly recyclable due to its composition of polypropylene copolymers, also known as plastic #5. Recycling corrugated plastic helps reduce waste and lower your carbon footprint, contributing to a more sustainable future.
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Skin irritation prevention
Corrugated plastic is a versatile material used for roofing, set design, and window insulation. It is lightweight, rot-proof, waterproof, and easy to work with. However, it can cause skin irritation due to the presence of glass fibres. Here are some detailed instructions for preventing skin irritation when working with corrugated plastic:
Before handling corrugated plastic, it is important to take preventative measures to protect your skin. Start by wearing protective clothing, such as long sleeves and gloves, to minimise direct skin contact with the material. It is also recommended to apply a barrier cream to any exposed skin areas, such as your face and neck. Choose a cream that forms a protective barrier against irritants and apply a generous amount to create a shield.
When cutting corrugated plastic, use appropriate tools to minimise the risk of injury and skin irritation. Opt for scissors or tin snips instead of power tools to reduce the spread of plastic particles and fibres. If using power tools, ensure they have dust collection systems or attach a vacuum hose to capture any airborne particles. Always wear safety goggles and a respirator to protect your eyes and lungs from plastic debris.
After handling corrugated plastic, it is crucial to clean your skin thoroughly. Wash your hands and any exposed skin areas with mild soap and warm water to remove any residual fibres or particles. Pay close attention to your fingernails and the crevices between your fingers, as plastic fibres can become lodged in these areas. Additionally, consider using a moisturiser or skin lotion to soothe and protect your skin after exposure.
If you experience any skin irritation, such as redness, itching, or rashes, take immediate action. Apply a soothing lotion or cream, such as calamine lotion or hydrocortisone cream, to alleviate discomfort and promote healing. If the irritation persists or becomes severe, seek medical advice from a healthcare professional. They may recommend over-the-counter medications or prescribe appropriate treatments to manage your symptoms.
By following these preventative measures, you can effectively minimise the risk of skin irritation when working with corrugated plastic. Prioritising skin protection and taking the necessary precautions will help ensure a safe and comfortable experience during your project. Remember to be vigilant about skin care and always prioritise your health when working with potentially irritating materials.
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