
Replacing plastic basement windows can be a fun DIY project that improves your home's energy efficiency, functionality, comfort, and value. It is important to accurately measure the window opening and order a slightly smaller window to ensure a proper fit. Before installing the new window, address any rot or damage in the surrounding structure and consider upgrading to an energy-efficient window for better insulation. After installation, proper maintenance, including regular inspections, cleaning, and timely repairs, is necessary to extend the lifespan of the new window.
| Characteristics | Values |
|---|---|
| Reasons to replace basement windows | Improving energy efficiency, comfort, and appearance |
| When to replace basement windows | When they cannot be closed or opened, or when there is observable wear and tear |
| Types of basement windows | Egress windows, Columbia, Monarch, Kewanee, etc. |
| Steps to replace basement windows | 1. Measure the existing window opening. 2. Order a slightly smaller window. 3. Remove the old window. 4. Cut away any leftover caulk and chipping paint. 5. Smooth and clean the window frame. 6. Slide the new window into the opening. 7. Center and secure the window. 8. Replace the caulk around the new window. |
| Challenges | Uneven openings, water drainage issues, rot or damage |
| Maintenance | Regular inspections, cleaning, and timely repairs |
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What You'll Learn

Prepare the window opening
Preparing the window opening is a crucial step in replacing plastic basement windows. Here is a step-by-step guide to help you through the process:
Step 1: Measure the Window Opening
Before purchasing a replacement window, carefully measure the existing window opening. This is important to ensure you buy the correct size. It is generally recommended to order a window slightly smaller than the opening, as making a larger window fit a smaller opening is more challenging.
Step 2: Remove the Old Window
Start by removing the interior trim around the window using a hammer and pry bar, being careful not to break the glass. Then, unscrew the hinges attaching the window sash to the window frame. Remove the window sash and screen. Finally, take out the window frame using a hammer and pry bar or reciprocating saw, being mindful not to damage the surrounding structure.
Step 3: Clean and Inspect the Window Opening
Once the old window is removed, clean the window opening thoroughly. Use a utility knife to cut away any leftover caulk, and a paint scraper to remove any chipping or flaking paint. You can use a sanding block to smoothen the surface and get it ready for the new window. After cleaning, inspect the window opening for any damage or rot. Address these issues before installing the new window, such as by replacing damaged wood or treating the area to prevent future problems.
Step 4: Prepare for the New Window
To prepare the window opening for the new window, attach flashing tape to the sill and take it up one-third of the way on both sides of the opening. This helps prevent moisture ingress and protects the framing. If you are installing a new window in a concrete wall, you may need to cut a hole and create a custom frame. You can also fill the exposed wall blocks with crumpled newspapers and concrete to create a smooth surface for the new window.
Remember, proper preparation is key to a successful window replacement project. Take your time with each step, and don't hesitate to seek professional help if needed, especially if you encounter structural challenges or need to install a larger window.
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Remove the old window
Removing an old window is a manageable DIY project, but it is labour-intensive and can be challenging. It is important to take accurate measurements to ensure a proper fit for the new window.
First, measure the width and height of the existing window opening at multiple points, as older openings may not be perfectly square. Use the smallest measurements to determine the size of the new window. Check the squareness of the frame by measuring the diagonals from corner to corner. If the frame is out of square by 1/4 inch or more, you may need a full-frame replacement.
Next, remove the sash from the existing window. If the window is made of aluminium, push down on the tabs at the top of the window and gently pull it towards you, being careful of any dirt or debris. For wooden windows, open the lower sash about 4-5 inches, then push against the jamb liners at the top of the open sash and pull the lower sash towards you until it rotates 90 degrees in the frame. Lift one side of the sash to disengage the tilt pin, then repeat on the other side.
Now, you can remove the frame from the wall opening. Use a reciprocating saw to cut through the old frame, and a hammer and chisel to chip away any mortar from the sides of the opening. If the window is surrounded by metal frames, you may need a large pry bar to bend the metal and remove the frame.
Before installing the new window, address any issues such as rot or damage in the surrounding structure. Replace any damaged wood and treat the area to prevent future problems.
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Address any rot or damage
Before installing a new window, it is important to address any rot or damage in the surrounding structure. Firstly, assess the extent of the rot. Minor damage may only affect the surface and can often be repaired. Indicators of repairable damage include small, localized areas of soft, discoloured wood. On the other hand, if the rot has penetrated deep into the wood, compromising the frame's structural integrity, replacement might be necessary.
If you notice any signs of rot, such as water stains around the frames, wet patches below them, softness, crumbling paint, or any signs of swelling, it is important to take action. You can start by removing the rotted wood and treating the area to prevent future problems. Fill the gap with wood filler or epoxy, and repaint or seal the frame. It is also important to address any moisture issues that may have caused the rot, as this will help to prevent future damage.
If the damage is more significant, it may be best to hire a professional to repair or replace the window frame. Replacing the entire frame can be more expensive upfront, but it may be more economical in the long run. New windows can improve energy efficiency, reduce maintenance needs, and enhance the overall value of your home.
To prevent rot and ensure your windows remain functional and aesthetically pleasing, early detection and regular maintenance are key. Regular inspections, cleaning, and timely repairs are essential. Proper maintenance involves regularly inspecting your basement window for signs of damage or wear and tear. Check the seals, frame, and glass for any issues. Keep your basement window clean to allow light to enter and prevent dirt buildup. Use a mild detergent and water to clean the glass, frame, and seals.
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Insert the new window
Inserting a new window is a manageable DIY project, but you may encounter challenges such as uneven openings, water drainage issues, and rot or damage. Before inserting the new window, ensure that you have addressed any issues with the surrounding structure. This may involve replacing damaged wood or treating the area to prevent future problems.
When inserting the new window, make sure the slider handle is facing inside. Place the window in the opening and push it forward until the take-out tabs click into place. No caulk is required for this step. Use shims to centre the new window in the opening and to level it if the opening is uneven. Fill any gaps with expandable foam before caulking to get a tight and secure fit.
If your new window is an egress window, check local building codes for compliance. Upgrading to an egress window can affect the structural integrity of your home as it involves creating a larger hole in a foundation wall.
Finally, paint or finish the new window promptly to protect it from the elements. Proper maintenance will extend the lifespan of your new window and prevent damage.
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Maintain the new window
Maintaining your new basement window is essential to extend its lifespan and prevent damage. Here are some detailed steps to help you with this:
Regular Inspections
Regularly inspect your basement window for any signs of damage or wear and tear. Check the seals, frame, and glass for any issues. Early detection can prevent minor problems from becoming major repairs.
Keep it Clean
Clean your basement window regularly to allow light to enter and prevent dirt buildup. Use a mild detergent and water to clean the glass, frame, and seals. Avoid using harsh chemicals that could damage the window materials.
Address Water Drainage Issues
Proper water drainage is crucial to prevent leaks and rotting. Ensure that the ground slopes away from the foundation to allow water and rainfall to drain properly.
Maintain the Window Wells
Keep the window wells clear of debris, especially during heavy storms or in the fall. Debris can clog the drainage system and cause flooding in your basement. Check the window wells periodically, especially every quarter, to ensure no problems have occurred. Pay extra attention during the winter months, as ice and snow buildup can clog or damage the drain.
Comply with Building Codes
Check local building codes and ensure your new basement window complies with them. Many areas require the presence of window wells and egress windows for safety reasons and to meet minimum safety standards. Egress windows are larger and provide an emergency exit, which may be necessary in the basement.
By following these steps, you can effectively maintain your new basement window, ensuring its longevity and optimal performance.
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Frequently asked questions
Here is a list of steps to replace plastic basement windows:
- Measure the width and height of the existing window opening at multiple points and order a window slightly smaller than the opening.
- Remove the sash from the existing basement window.
- Use a reciprocating saw to cut through the old window frame.
- Pull out the old window frame from the wall opening.
- Slide the new window into the opening.
- Use shims to center the new window in the opening.
- Secure the window by screwing up through its frame and into the mudsill.
Here are some indications that you need to replace your basement windows:
- You cannot close your basement window, compromising your home's security.
- You cannot open your basement windows, leading to poor ventilation and increased humidity in the basement.
- Your basement windows are drafty, leaky, or deteriorated.
Here are some things to consider when replacing plastic basement windows:
- Choose a dry day to avoid moisture issues.
- Upgrade to an energy-efficient window for better insulation.
- Check local building codes for compliance, especially if you're installing an egress window.
- If you notice rot or damage in the surrounding structure, address these issues before installing the new window.








































