
Applying plastic to windows is a great way to increase energy efficiency and reduce utility bills. Plastic window film is an easy, effective, and inexpensive option to provide extra insulation for your windows. This process can be done as a DIY project, but it is important to have the right tools and preparation. This guide will provide a step-by-step process on how to effectively install plastic film on your windows and achieve the perfect finish.
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What You'll Learn

Choosing the right tools
Firstly, decide on the type of plastic film you want to use. There are various options available, such as window film kits, which can be found in different sizes at hardware and home improvement stores. These kits typically include window-sized pieces of plastic film and adhesive tape. Alternatively, you can opt for a roll of plastic and a separate weather-resistant adhesive tape, allowing you more flexibility in sizing.
Secondly, gather the necessary tools for installation. You will need a tape measure to accurately measure your windows and cut the film accordingly. Adding an extra inch or a few centimetres to each side will ensure a proper fit. A squeegee or a blow dryer can be used to smooth out any wrinkles and ensure the film adheres to the window. A hair dryer is also useful for heating the window frame, especially if it's too cold, which can help the tape stick better.
Additionally, for preparation, you will need a cleaning solution and a cloth to thoroughly clean the window and frame before applying the film. This step ensures that dirt and dust do not interfere with the adhesion of the plastic. It is also recommended to have scissors or a sharp cutting tool to trim the plastic film neatly around the edges of the window.
Finally, for challenging installations, such as windows with mini-blinds, you may need to remove the rotating wand from the blinds before applying the film. This step will allow you to operate your mini-blinds even with the window film in place.
Remember, selecting suitable tools will make the process of applying plastic film to your windows more accessible and efficient, ensuring a neat and durable result.
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Measuring
Firstly, clean the window frame and ensure it is dry. This step is essential as it provides a smooth surface for the adhesive tape and film to stick to. Use a mixture of warm water and dish soap for effective cleaning.
Next, take your tape measure and record the exact width and height dimensions of the window frame. It is good practice to measure each window individually, as sizes can vary, even within the same property.
After recording the dimensions, add an extra inch to each side. For example, if your window measures 30 inches by 40 inches, you will add an extra inch to each of these measurements, resulting in a final film size of 32 inches by 42 inches. This additional inch will provide some leeway when installing the film and ensure a tight seal.
Now, you can begin the process of cutting the plastic film to size. It is important to be precise during this step to avoid wasting material and ensure a snug fit. Take your time and consider using a ruler or straight edge to guide your cutting tool for straight and accurate cuts.
Once you have cut the film to size, it is a good idea to check it against the window. Place the cut film over the window frame to ensure it covers the entire area. Make any necessary adjustments if the film does not align correctly.
By following these measuring and cutting instructions, you will have a well-fitted plastic film that effectively seals your window, improving insulation and reducing energy loss. Remember, accurate measurements are key to a successful installation.
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Preparing the window
To prepare a window for plastic application, you will need to gather the right tools. Most of these tools are not specialised and can be found in a simple DIY toolbox. You will need a window film kit, tape measure, scissors, blow dryer, and a mixture of warm water and dish soap. A spray bottle filled with a slip solution is also required. If you are working with metal-framed windows, you will need a plastic brush to scrub off any loose paint or rust.
Once you have gathered your tools, you can begin preparing the window. First, clean the window and window frame with your mixture of warm water and dish soap. If you are working with metal frames, use a plastic brush to scrub off any loose paint or rust. Ensure that the window frame is completely dry before proceeding.
Next, use your tape measure to record the exact dimensions of the window, adding one inch to each side. Then, cut the film to size. Unfold the first 12 inches of film along the entire width of the window, leaving the remainder of the film stuck together. The folded edge can be recognised by its crinkly texture when laid flat. If the film is difficult to separate, moisten your thumbs and fingers and gently rub the folded edge until it separates.
Now, apply the adhesive tape around the window frame, removing the paper cover. Starting at the top corner, attach the window film to the adhesive tape. You can reposition the tape until you achieve a good fit. Smooth out any bumps or wrinkles with your hands.
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Applying the film
Before you begin, ensure you have the right tools. You will need a window film kit, tape measure, scissors, and a blow dryer. You will also need a spray bottle filled with a slip solution.
First, unfold 12 inches (30.5 cm) of film along the entire width of the window. Leave the remainder of the film stuck together, as the inside surfaces facing the glass will immediately start to attract dust. If the film is tricky to separate, moisten your thumbs and fingers and gently rub the folded edge of the film until it separates.
Next, apply the adhesive tape to the frame and remove the paper cover. Measure the window and add one inch to each side. Cut the film and repeat this process for each window. Starting at the top corner, attach the window film to the adhesive tape. You can reposition the tape until you get a good fit. Smooth out any bumps or wrinkles with your hands.
Use a blow dryer to adhere the film, starting with the border of the window frame and then addressing any remaining wrinkles. Be careful not to touch the plastic with the blow dryer as it can cause it to melt.
Finally, trim the excess film with a snap-off knife. Pull gently at the film where you are cutting to keep it perpendicular to the window and tape. Hold the knife parallel to the window, pointing away from the centre, and trim the excess film a fraction of an inch from the edge of the tape.
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Trimming and drying
Trimming
After applying the window film, you will need to trim the excess film. Use a snap-off knife to cut a fraction of an inch (less than a centimeter) from the edge of the tape. Hold the knife parallel to the window and swept back, pointing away from the center. This will ensure the film sweeps by as it cuts, reducing the chance of tears. Pull very gently at the film where you are cutting to keep it taut and perpendicular to the window and tape. Be very careful not to extend the knife too far and always stand in a stable position to avoid injury in case of an accident.
Drying
Use a blow dryer to adhere the film. Start by going around the border of the window frame and then address any remaining wrinkles. Make sure not to touch the plastic with the blow dryer, as it can cause it to melt.
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Frequently asked questions
Applying plastic to windows can help to increase energy efficiency, reduce drafts, and lower utility bills.
You will need a window film kit, tape measure, scissors, hair dryer, squeegee, and a spray bottle filled with a slip solution.
First, clean the window and window frame with a mixture of warm water and dish soap. Then, apply adhesive tape around the window frame. Measure the window and cut the film, leaving a few inches on each side. Unfold the first 12 inches of the film and stick it to the tape. Smooth out any bumps or wrinkles with your hands and use the hair dryer to adhere the film, being careful not to melt the plastic.
Applying plastic to windows is a simple DIY project that most homeowners can do themselves. However, if you are unsure or uncomfortable with the process, consider hiring a handyman or a home energy professional.











































