Maya Ellison
Sealing windows with plastic sheeting is a straightforward process that can improve a home’s energy efficiency and lower utility bills. It is a cost-effective solution to prevent heat loss during winter, which can be done by trapping a layer of air between the window pane and the plastic film. Before applying the plastic film, it is important to clean the window and ensure that the gaps are dry and free of residue. One can use a utility knife to remove old sealants and then apply the plastic sheeting, sealing the corners and checking for any drafts.
How to seal windows with plastic sheeting
| Characteristics | Values |
|---|---|
| Why seal windows? | To improve energy efficiency, lower utility bills, and prevent damage |
| When to seal windows? | When condensation, fogging, drafts, or increased energy bills are noticed |
| Tools | Utility knife, gloves, mineral spirits, drop cloths, paint brushes/rollers, sealant, caulking gun, silicone, PVC trim/strips, bleach, mould remover |
| Steps | 1. Remove old sealant with a utility knife or razor blade. 2. Clean the frames. 3. Apply sealant with a caulking gun. 4. Seal the corners. 5. Check your work. |
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What You'll Learn
How to identify air leaks
Sealing windows with plastic sheeting can be a cost-effective way to reduce air leaks and lower energy bills. Before sealing, it is important to identify the sources of air leaks in your home.
One simple way to identify air leaks is to use the 'hand test'. On a particularly hot or cold day, walk around your home and feel for temperature differences near windows and doors. If you feel a draft, this indicates an air leak.
Another common method is the 'incense test'. Close all windows, exterior doors, and fireplace flues. Turn on all exhaust fans that blow air outside, such as your clothes dryer or bathroom fans. Light an incense stick and slowly move it around the edges of windows and doors. If the smoke is sucked out or blown into the room, this indicates an air leak.
You can also use a flashlight to detect leaks. Turn off all the lights in your home and shine a flashlight at night over potential gaps. Ask a partner to observe the house from outside for rays of light, which indicate large cracks.
For a more advanced approach, consider using a thermal leak detector or an ultrasonic air leak detector. These devices can identify thermal leaks and air leaks, respectively, and can be purchased online or at hardware stores.
Finally, a professional can conduct a blower door test, which depressurizes your home to reveal the location of many leaks. This comprehensive method can also determine which areas require additional insulation.
By identifying and sealing air leaks, you can improve your home's energy efficiency and enhance your comfort.
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Using a window insulation kit
Prepare the Window:
Before applying the plastic sheeting, ensure the window is clean and accessible. Remove any old sealant or residue from the window frame using a utility knife or blade. Wipe down the frame to ensure no residue remains, as this will impact the adhesion of the new sealant.
Apply the Sealant:
Load the window sealant cartridge into a caulking gun. Cut the cartridge tip at an angle, then apply the sealant to the gap between the window frame and the wall. Work steadily from top to bottom on the sides and along the top or bottom of the window. Once applied, engage the pressure release catch on the caulking gun to prevent excess sealant from oozing out.
Attach the Plastic Sheeting:
Follow the instructions on your window insulation kit for specific application techniques. Typically, you will unroll the plastic sheeting and cut it to the size of the window, leaving a few inches of excess on all sides. Apply the adhesive provided in the kit, or use double-sided tape, to attach the plastic sheeting to the window frame. Smooth out any wrinkles or bubbles for a tight fit.
Secure the Edges:
Use a hairdryer to heat the edges of the plastic sheeting, shrinking the film for a snug fit. This step may vary depending on the specific kit you are using, so refer to the instructions provided. Some kits may include a sealing tape to secure the edges further and create a tighter seal.
Final Checks:
Once the plastic sheeting is securely in place, inspect your work for any gaps or leaks. Ensure the window can still be operated as intended, and make any necessary adjustments. Enjoy the improved comfort and energy efficiency provided by your newly sealed windows!
Remember, if you rent your space, always check with your landlord before starting any DIY projects.
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Applying caulk or sealant
When applying caulk or sealant, you should first ensure that the gaps are clean and dry. Any moisture or dust will prevent the new sealant from adhering, compromising the window seal. You can use a utility knife or blade to remove the old sealant, and then wipe around the edge of the window frame with a cloth to ensure no residue remains.
Before applying the new sealant, load the window sealant cartridge into the caulking gun. Then, cut the end at an angle. Apply the sealant to the gap, working steadily from top to bottom on the sides and along the top or bottom. Once applied, press the pressure release catch on the caulking gun to prevent more product from oozing out.
For extra protection, you can seal the entire window with removable caulk if you do not intend to open it. You can also use decorators' caulk, but be aware that it will crack over time as the window expands and contracts due to heat.
If you are sealing a window from the inside, apply caulk around the perimeter of the window, then seal the cracks between the interior trim and the wall, as this is where air leakage is most likely to occur.
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Removing old sealant
Firstly, it is important to gather the necessary tools, such as a utility knife, razor blade, or a flexible snap-off knife. These tools will help you cut through the old sealant or caulk without causing damage to the window frame. Ensure you are wearing protective gloves to safeguard your hands during the process.
Next, carefully use your chosen tool to cut away as much of the old sealant as possible. Hold the blade almost flat against the frame and cut along both edges of the sealant. This step may require some elbow grease, especially if the sealant is particularly stubborn. If you are having difficulty, you can try using a silicone remover, which will turn into a gel overnight and make the removal process easier.
Once you have removed the majority of the sealant, it is time to address any remaining residue. For this, you can use a small flat screwdriver or a scraper to gently pull out any stubborn bits of silicone. Be cautious not to apply too much force, as you don't want to scratch or damage the window frame or the glass. If necessary, apply a second coat of silicone remover and repeat the process.
After removing the bulk of the sealant, it is essential to clean the frames thoroughly. Use hot soapy water to wash away any dirt or remaining bits of silicone. Ensure that the frames are completely clean and dry before proceeding to the next step of applying new sealant.
Finally, inspect the window frame for any large gaps or imperfections. If you notice any significant gaps, use foam to fill them and then cut back to create a smooth and flush surface. Once the foam has cured, you can proceed to the resealing process, ensuring that you use a high-quality sealant for the best results.
By following these steps, you can effectively remove old sealant from your windows, creating a clean and smooth surface for the application of new sealant. Remember to take your time, work carefully, and wear protective gear to ensure a safe and successful project.
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When to reseal windows
The decision to reseal windows depends on the current state of the windows. There is no one-size-fits-all solution, but there are some key indicators that it's time to reseal.
Firstly, check for gaps between the window and the siding, and inspect the condition of the frame and glass. If there is damage to the frame from impact or temperature changes, or if there is rotting or cracking of the frame, the entire window may need to be replaced. If the structure is strong, resealing is a more economical option.
Secondly, check for signs of a broken seal. If you notice condensation or fogging between the panes of glass, this is a sure sign that the seal has failed and is allowing moisture to enter, potentially compromising the structure. This is a common issue with modern insulated glass units, which can suffer from seal failure due to pressure changes between the gas inside and the air outside.
Thirdly, inspect the caulking. If the original bead of caulk between the trim and the wall is dried, flaking, cracked, or compromised, air leaks can occur. In this case, a new layer of caulking can be applied to fill the exposed space.
Finally, check the weatherstripping. If this is damaged or missing, it can be replaced to plug any open spaces between moving parts of the window.
It is important to note that resealing is a temporary fix and that windows have a lifespan. If your windows are nearing 20 years old, it may be more practical to replace them.
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Frequently asked questions
Window insulation kits are a simple and easy way to seal windows with plastic sheeting. They work by trapping a layer of air between the window pane and the film, improving energy efficiency.
Basic tools include gloves, mineral spirits, drop cloths, a utility knife, a caulking gun, and sealant.
There are a few signs to look out for, including condensation, fogging, drafts, and increased energy bills.
