Alexei Volkov
Creating a plastic window well cover is a practical DIY project that can enhance both the safety and aesthetics of your home. Window well covers are essential for protecting basement windows from debris, water, and snow while preventing accidents by providing a sturdy surface over the well. To make one, you’ll need durable plastic sheeting, such as polycarbonate or acrylic, which offers clarity and strength. Begin by measuring the dimensions of your window well to ensure a precise fit, then cut the plastic to size using a utility knife or saw. Next, frame the cover with aluminum or PVC trim for added stability and a professional finish. Secure the cover to the well using hinges or brackets for easy access, and consider adding a locking mechanism for security. Finally, apply weatherstripping to seal any gaps, ensuring the cover is watertight. With careful planning and execution, a custom plastic window well cover can be both functional and long-lasting.
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What You'll Learn
Measure Window Well Dimensions
Accurate measurements are the cornerstone of a well-fitting plastic window well cover. Begin by gathering your tools: a tape measure, pencil, and paper. Measure the width, length, and depth of the window well, noting any irregularities or obstructions like drains or vents. Record these dimensions precisely, as even a quarter-inch discrepancy can compromise the cover’s functionality. For curved or angled wells, take multiple measurements at different points to ensure a snug fit.
Consider the material’s flexibility when measuring. Plastic covers can accommodate slight variations, but overly tight measurements may cause warping, while overly loose ones risk gaps. Add a 1- to 2-inch margin to each dimension to account for installation ease and potential shifting over time. If your well has a lip or edge, measure its height and width separately, as this will influence how the cover sits and secures.
Compare your measurements to standard cover sizes if you plan to modify a pre-made option. Most window wells fall within a 24- to 48-inch width range and 48- to 96-inch length range, but custom wells may require bespoke solutions. If your dimensions fall outside standard ranges, consider creating a template from cardboard or thin plywood to visualize the cover’s shape before cutting the plastic.
Finally, double-check your measurements before proceeding. Errors at this stage can lead to wasted materials and time. If possible, have a second person verify your numbers. Remember, the goal is not just to cover the well but to create a durable, weather-resistant barrier that enhances safety and aesthetics. Precision now pays dividends later.
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Choose Durable Plastic Material
Polycarbonate stands out as the premier choice for window well covers due to its exceptional impact resistance and longevity. Unlike acrylic, which can yellow or crack under prolonged UV exposure, polycarbonate maintains clarity and structural integrity for decades. Its ability to withstand heavy loads—up to 400 pounds per square foot in some formulations—makes it ideal for areas with high foot traffic or potential debris impact. For DIY projects, opt for 0.25-inch thick polycarbonate sheets, which balance durability with ease of cutting and installation.
When selecting plastic materials, consider the environmental conditions your window well cover will face. Polyethylene, while cheaper, lacks the rigidity and UV resistance of polycarbonate, making it prone to warping in extreme temperatures. ABS plastic, often used in automotive parts, offers moderate durability but can become brittle over time. For coastal regions, ensure the material is corrosion-resistant, as saltwater exposure can degrade lesser plastics. Always check the manufacturer’s UV stabilization rating—a critical factor in preventing degradation from sunlight.
Cost-effectiveness doesn’t mean compromising on quality. While polycarbonate may have a higher upfront cost compared to PVC or acrylic, its lifespan justifies the investment. A well-made polycarbonate cover can last 20+ years with minimal maintenance, whereas cheaper alternatives may require replacement within 5–7 years. For budget-conscious projects, look for recycled polycarbonate options, which retain 80–90% of the material’s original strength while reducing environmental impact.
Installation techniques play a pivotal role in maximizing the durability of your plastic window well cover. Use stainless steel or galvanized fasteners to avoid rust, and pre-drill holes to prevent cracking during assembly. Apply a silicone sealant along the edges to create a watertight seal, preventing moisture infiltration that can weaken the material over time. For added stability, incorporate aluminum framing or reinforcement bars, especially for larger covers spanning more than 4 feet.
Finally, maintenance is key to preserving the durability of your plastic cover. Clean the surface bi-annually with mild soap and water to remove dirt and debris that can scratch or degrade the material. Inspect for cracks or loose fasteners, addressing issues promptly to prevent further damage. In snowy climates, use a snow-melting mat or regularly clear snow buildup to avoid excessive weight. With proper care, a durable plastic window well cover will protect your basement for years, outperforming less robust alternatives.
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Cut and Shape the Cover
Precision is paramount when cutting and shaping a plastic window well cover, as even a millimeter’s misalignment can compromise its functionality. Begin by transferring the measured dimensions of your window well onto the plastic sheet using a straightedge and a permanent marker. Polycarbonate or acrylic sheets, at least ¼ inch thick, are ideal for durability and clarity. Secure the sheet firmly to a flat work surface with clamps to prevent shifting during cutting. For straight cuts, a fine-toothed plastic-cutting blade in a circular saw or jigsaw works best; ensure the blade’s teeth are designed for acrylic to avoid chipping. Always cut slowly, allowing the blade to do the work, and wear safety goggles to protect against flying debris.
Shaping the cover to fit the contours of your window well requires both creativity and caution. If your well has rounded corners or curves, use a heat gun to gently warm the plastic until it becomes pliable—typically around 300°F (150°C). Avoid overheating, as this can cause warping or discoloration. Once softened, bend the plastic gradually along the marked lines, using wooden molds or sandbags to hold the shape until it cools. For intricate curves, consider scoring the plastic lightly along the bend line with a utility knife before heating to guide the fold. Test the fit frequently by placing the cover over the well, making minor adjustments as needed.
A common mistake in this phase is neglecting to account for expansion and contraction due to temperature changes. Leave a ¼-inch gap around the edges of the cover to allow for thermal movement, preventing cracking or buckling over time. If your design includes a hinged or removable section for egress, ensure the cut lines are clean and aligned. Use a file or sandpaper to smooth any rough edges, which not only improves aesthetics but also prevents snagging on clothing or skin. For added safety, consider rounding sharp corners with a heat gun or router.
The final shaping step involves integrating practical features like drainage holes or ventilation slits. Drill ½-inch holes along the lower edge of the cover to prevent water pooling, spacing them 6–8 inches apart for optimal flow. If ventilation is a concern, cut narrow slits along the sides using a Dremel tool with a cutting wheel, ensuring they’re small enough to deter pests but large enough to allow airflow. Reinforce any cutouts or weak points with plastic welding or adhesive-backed trim for longevity. By combining meticulous cutting with thoughtful shaping, you’ll create a cover that’s not only functional but tailored to your window well’s unique demands.
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Install Hinges or Latches
Hinges and latches transform a static window well cover into a functional, accessible solution. By incorporating these hardware elements, you gain the ability to easily lift or open the cover for cleaning, maintenance, or emergency egress. The choice between hinges and latches depends on your specific needs: hinges allow the cover to swing open, while latches secure it in a fixed position until manually released. Both options enhance usability and safety, ensuring your window well remains protected without becoming a permanent barrier.
When selecting hinges for a plastic window well cover, prioritize durability and weather resistance. Stainless steel or galvanized steel hinges are ideal, as they withstand rust and corrosion from moisture and temperature fluctuations. For installation, position the hinges along the back edge of the cover, ensuring they align with the window well’s frame. Use stainless steel screws to secure them, pre-drilling holes to prevent cracking the plastic. Test the hinge mechanism after installation to ensure smooth operation and adjust as needed for proper clearance.
Latches offer a simpler alternative to hinges, particularly for smaller or lighter covers. Choose a latch with a locking mechanism for added security, such as a snap lock or twist latch. Install the latch on the front edge of the cover, ensuring it engages with a strike plate mounted on the window well’s lip. For optimal performance, position the latch at least 6 inches from the corners to distribute force evenly and prevent warping. Regularly lubricate the latch with silicone-based spray to maintain smooth operation and prevent debris buildup.
A critical consideration when installing hinges or latches is ensuring compliance with local building codes, especially for basement window wells. Many jurisdictions require window wells to serve as emergency exits, meaning the cover must be easily removable from the inside. Hinges with interior release mechanisms or latches accessible without tools are ideal for meeting these standards. Always verify code requirements before finalizing your design to avoid costly modifications later.
Incorporating hinges or latches into your plastic window well cover not only improves functionality but also extends its lifespan by facilitating maintenance. Hinged covers can be swung open for debris removal, while latched covers can be quickly unfastened for cleaning. Both options eliminate the need to lift or store a heavy cover, reducing wear and tear on the material. By investing time in proper hardware installation, you create a practical, long-lasting solution that balances protection with accessibility.
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Secure Cover with Weatherproofing
A well-secured plastic window well cover must withstand not only weight and impact but also the relentless assault of weather. Weatherproofing is the unsung hero here, ensuring longevity and functionality. Begin by selecting a UV-resistant plastic to combat sun damage, which can cause brittleness and cracking over time. Polycarbonate or acrylic sheets are ideal due to their durability and transparency, allowing light to pass through while blocking debris and water.
Next, focus on the sealing process. Use a silicone-based weatherstripping tape along the edges where the cover meets the foundation. Apply the tape evenly, pressing firmly to create a watertight seal. For added protection, consider a bead of exterior-grade silicone caulk along the seam. This dual approach prevents water infiltration, which can lead to basement moisture issues. Ensure the cover slopes slightly away from the house to encourage rainwater runoff.
Attachment methods play a critical role in weatherproofing. Secure the cover with corrosion-resistant screws or bolts, spaced no more than 12 inches apart for even support. Use rubber washers under each fastener to prevent water seepage through the mounting holes. If your design includes hinges for accessibility, opt for stainless steel or coated metal to resist rust. Regularly inspect these components, especially after extreme weather, to tighten any loose fittings and replace compromised seals.
Finally, integrate a drainage system to complement your weatherproofing efforts. Install a small channel or gutter along the cover’s lower edge to direct water away from the foundation. Pair this with a gravel-filled trench or downspout extension to manage runoff effectively. This proactive measure reduces hydrostatic pressure on the well and minimizes the risk of flooding. By combining these strategies, your plastic window well cover will remain secure and weather-resistant, protecting your home year-round.
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Frequently asked questions
You will need a sheet of clear or opaque plastic (polycarbonate or acrylic), measuring tape, a utility knife or saw, weather-resistant adhesive, screws or bolts, and a drill. Optional materials include a rubber gasket for sealing and a handle for easy access.
Measure the length, width, and depth of your window well. Add 2-3 inches to each dimension for overlap. Transfer these measurements to the plastic sheet and use a straight edge and utility knife or saw to cut it. For curved wells, heat the plastic slightly to bend it to shape.
Drill holes in the plastic and window well frame, then secure the cover with screws or bolts. Apply weather-resistant adhesive along the edges for added protection. Use a rubber gasket or sealant to prevent water leakage and ensure a tight fit.
