
Applying plastic film to windows is a great way to increase energy efficiency and reduce utility bills. It's a simple and inexpensive DIY project that can be done with basic tools. The plastic film provides extra insulation by sealing off cracks where air can enter, reducing drafts, and preventing moisture buildup. It can be purchased in kits with window-sized pieces or larger sheets for patio doors. Before installing, it's important to clean the window and frame, and ensure you have the right tools, including a tape measure, scissors, adhesive tape, and a blow dryer. This guide will walk you through the process step-by-step, ensuring a neat and effective installation.
| Characteristics | Values |
|---|---|
| Purpose | To increase energy efficiency, reduce utility bills, and prevent drafts |
| Installation Difficulty | Easy and suitable for DIY, but professional installation is recommended |
| Tools Required | Window film kit, tape measure, scissors, blow dryer, cleaning supplies, adhesive tape, snap-off knife, squeegee, spray bottle with slip solution |
| Steps | Clean window and frame, apply adhesive tape, cut film to size, attach film to tape, smooth out bumps, use blow dryer to adhere, trim excess film |
| Window Types | Not suitable for Plexiglass or plastic windows due to outgassing and adhesion issues |
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What You'll Learn

Getting the right tools
To get started with applying plastic window film, you will need to gather the right tools. The good news is that these tools are not specialised, and you should be able to find them in a simple DIY toolbox. If you don't have some of these items, you can easily purchase them at a hardware store.
First, you will need a window film kit, which includes the plastic film itself. You can purchase these kits in various sizes at home improvement, hardware, and discount stores. The film comes in window-sized pieces, so make sure to buy a kit that fits the width of your window.
Next, you will need a tape measure to record the exact dimensions of the window. You will also need scissors or a snap-off knife to cut the film to size, leaving a little excess on each side. A snap-off knife is particularly useful for trimming the excess film, as it can help you avoid accidentally cutting yourself.
You will also need adhesive tape, which comes with the window film. This tape is applied around the window frame to hold the film in place. Additionally, you will need a hair dryer or blow dryer to adhere the film and remove any remaining wrinkles.
For the installation process, it is recommended to have a spray bottle filled with a slip solution. You will also need a squeegee to dry the water behind the film and smooth out any bumps or wrinkles. Finally, it is important to have a clean window and window frame before applying the film, so make sure to have some warm water, dish soap, and a cloth or sponge for cleaning.
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Measuring
Firstly, ensure you have the right tools for the job. You will need a tape measure, scissors, and a window film kit. These kits are readily available at home improvement and hardware stores and come with window-sized pieces of film. Before measuring, clean the window frame thoroughly and allow it to dry. This step is important as it ensures a smooth surface for accurate measurements and effective adhesion.
Now, use your tape measure to record the precise dimensions of the window. Measure the width and height of the window frame, adding an extra inch to each side. This extra allowance is necessary for the film to properly adhere to the frame and can be trimmed later. Repeat this process for each window to ensure a consistent fit. It is worth noting that some kits may already have pre-cut window-sized pieces of film, saving you time on measurements.
When measuring, it is important to be as accurate as possible. Take your time and double-check your measurements before cutting the film. Once you have your measurements, you can cut the film accordingly. Always cut the film slightly larger than needed, as mentioned, you can trim the excess later.
Finally, when measuring, consider the type of window frame you have. Metal frames, for example, present unique challenges due to moisture issues. Smooth metal frames without loose paint or rust are ideal for window film application. Remember, accurate measurements are key to a successful installation, so take your time and ensure precision throughout the measuring process.
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Preparing the window
Before applying plastic window film, it is important to prepare the window properly to ensure a good finish and avoid costly mistakes. Here is a step-by-step guide to preparing your window for plastic film installation:
Clean the Window and Frame
Start by thoroughly cleaning the window and window frame. Use a mixture of warm water and dish soap to remove any dirt, dust, or grime. Ensure that you clean both the glass and the frame, as any residue can affect the adhesion of the film. For metal frames, use a plastic brush to scrub off any loose paint or rust. It is important to ensure the window is completely dry before proceeding to the next step.
Measure the Window
Use a tape measure to record the exact dimensions of the window. Add one inch (or a few centimetres) to each side to ensure the film covers the entire window and extends over the woodwork. This will help create a better seal and improve insulation. Record these measurements carefully, as you will need them for the next step.
Cut the Film
Based on the measurements you took, cut the plastic film to size. It is important to be precise when cutting to ensure a neat finish. Remember to leave a small excess on each side, as mentioned in the previous step. Unfold the first 12 inches (30 cm) of the film along the width of the window, leaving the remainder folded. If the film is tricky to separate due to static, moisten your thumbs and gently rub the edge until it separates.
Apply Adhesive Tape
Now you will apply the adhesive tape to the window frame. This tape will hold the plastic film in place. Apply the tape to the front of the moulding and the sill, just inside the ridge of the moulding if there is one. Cut the tape at the proper length with scissors and remove the backing paper. Overlap the next piece of tape by a few centimetres to ensure a continuous adhesive surface. Be careful not to touch the sticky side of the tape, as this can reduce adhesion.
Prepare the Film
With the window and tape prepared, it's now time to prepare the plastic film. If your film has a backing liner, remove it and spray the sticky side with a slip solution. This will help with the application process. The sticky side of the film and the window should both be wet when applying the film.
Now you are ready to begin installing the plastic window film. Carefully follow the manufacturer's instructions for the specific type of film you are using, and consider seeking professional assistance if you are unsure about any steps.
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Applying the film
Firstly, clean the window and window frame with a mixture of warm water and dish soap. If you are applying the film to a metal frame, ensure that it is smooth and free of loose paint or rust. Use a plastic brush to scrub off any excess.
Next, apply the adhesive tape to the frame, removing the paper cover. Measure the window and add one inch to each side, then cut the film to size. Unfold the first 12 inches of the film along the width of the window, leaving the remainder stuck together. Stick the top edge of the film to the centre of the tape, leaving a little excess on each side. Smooth out any bumps or wrinkles with your hands.
Use the blow dryer to adhere the film, starting at the border of the window frame and then addressing any remaining creases. Be careful not to touch the plastic with the blow dryer, as it may melt.
Finally, trim the excess film with a snap-off knife, being careful not to tear the film.
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Trimming and drying
Trimming
Trim the excess film with a snap-off knife. Pull very gently at the film where you are cutting to keep it taut and perpendicular to the window and tape. Hold the knife parallel to the window and pointing away from the centre. Cut the excess film a fraction of an inch (less than a centimetre) from the edge of the tape. This technique eliminates the need to scrape the window frame near the tape. Hold the knife swept back so that the film sweeps by as it cuts, rather than bunching up at a single point. This will result in a smoother cut. Take care not to tear the film across the line of the tape.
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. The film will shrink and stay shrunk, so be careful not to overheat it. If you want to reuse the film, you can skip the blow dryer step and carefully stretch it to remove wrinkles.
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Frequently asked questions
Plastic window film is an inexpensive way to increase energy efficiency and reduce utility bills. It provides extra insulation and reduces drafts, making your home feel warmer in the winter. It also helps to reduce condensation and eliminate air leaks around the window.
You will need a window film kit, tape measure, scissors, a hair dryer, and a cleaning solution made from warm water and dish soap. You may also need a plastic brush, a snap-off knife, and a spray bottle filled with a slip solution.
First, clean the window and window frame with your cleaning solution. Once the frame is dry, apply the adhesive tape and remove any paper cover. Measure the dimensions of the window and add one inch to each side. Cut the film to size, being careful not to touch the sticky side with your fingers as this will reduce adhesion.
Unfold 12 inches of the film along the width of the window, leaving the rest stuck together. Stick the top edge of the film to the centre of the tape, leaving a little excess on each side. Smooth out any bumps or wrinkles with your hands. Use a blow dryer to adhere the film, starting at the border of the window frame and then addressing any remaining wrinkles.
No, most window films will not work on Plexiglass or plastic windows. Applying window film to these surfaces can be difficult to remove and may result in outgassing, which affects the adhesive bond and creates unsightly bubbles. However, there are alternative solutions, such as installing a blister-free film over the Plexiglass before installing the window film.









































