Can I use plexiglass for a window well cover?

Quick Answer

Yes, plexiglass can be used to create a window well cover. Plexiglass, also known as acrylic glass, is a strong, transparent thermoplastic material that can be cut to size and used for various applications including window well covers. Some key advantages of using plexiglass for a window well cover are:

• Durability – Plexiglass is very durable and resistant to cracking or scratching. It can withstand exposure to weather elements.
• Lightweight – Plexiglass is lighter than glass but still provides strength and rigidity.
• Easy to install – Plexiglass can be cut to size and drilled to add hardware for mounting. It is easy to work with using basic tools.
• Cost effective – Plexiglass is generally cheaper than glass and easier to fabricate into a cover.
• Transparency – Plexiglass allows maximum light transmission while still providing protection.

When using plexiglass for a window well cover, choose an appropriate thickness (usually 1/8″ or more) to span the opening. The plexiglass can be mounted into a supporting frame or directly screwed into the window well walls. Just be sure to use compatible screws and washers to avoid cracking. Also, go for UV-resistant plexiglass if the cover will get direct sunlight exposure. With proper installation, plexiglass makes a great alternative to glass for covering window wells.

What is a Window Well Cover and Why Use One?

A window well cover is a protective barrier that goes over top of a window well. Window wells are built around basement windows that are below ground level to allow light into the basement. The well extends out from the house foundation and down to the basement window.

Window well covers are recommended for the following reasons:

• Safety – A cover prevents people, pets or objects from falling into the open window well where they could become trapped.
• Weather protection – Covers prevent rain, leaves, snow and other debris from accumulating in the window well where it could block the window or cause moisture damage.
• Temperature control – A cover provides an extra layer of insulation that helps reduce heat loss or gain through the window. This helps keep basement temperatures comfortable.
• Security – Window well covers offer a barrier to intruders attempting to enter through a basement window.
• Pest prevention – Covers keep insects, spiders and other pests from nesting in the window well and potentially getting inside.
• Aesthetics – Covers improve the appearance of window wells and the overall look of the home’s exterior.

Home builders often neglect to finish window wells with protective covers, so adding them is a worthwhile upgrade for any home with basement windows.

Plexiglass Overview and Properties

Plexiglass is the trademarked brand name for an acrylic plastic material called polymethyl methacrylate (PMMA). It was first developed in the 1930s as a shatterproof, lightweight alternative to glass. Some key properties and uses of plexiglass include:

• High strength and impact resistance – Plexiglass can withstand force and shock better than glass.
• Weather resistance – Plexiglass holds up well to exposure, UV rays, moisture and extreme temperatures.
• Transparency and clarity – Plexiglass transmits up to 92% of visible light for excellent transparency.
• Easy to fabricate – Plexiglass can be cut, drilled, bent and shaped using basic workshop tools.
• Light weight – Plexiglass is half the weight of glass making it easier to work with and install.
• Versatile – Used for windows, skylights, display cases, signs, aquariums, and more.
• Low maintenance – Plexiglass requires very little cleaning or care compared to glass.

Plexiglass is available in clear and colored transparent sheets, rods, tubes and custom extruded shapes. Acrylic manufacturing techniques also allow plexiglass to be made flexible or formulated for increased weather resistance through co-polymerization. Plexiglass offers glass-like qualities in a durable, lightweight and easy to work with plastic material.

Benefits of Plexiglass for Window Well Covers

The inherent properties of plexiglass make it well suited for creating protective covers over basement window wells. Benefits include:

Durability

Plexiglass has 10-17 times the impact strength of an equal thickness of glass. It is highly resistant to shattering or cracking when subjected to force, shock or blows. Plexiglass can withstand hail, falling debris, heavy winds and other impacts much better than glass. These durable properties make plexiglass ideal for creating window well covers that will hold up well over time.

Light Weight

Plexiglass weighs about half as much as glass. A standard 1/8″ thick plexiglass sheet weighs approximately 1.18 lbs per square foot versus standard 1/8” glass at 2.5 lbs per square foot. This lighter weight makes plexiglass sheets easier to lift, carry and install over a window well without needing multiple people or heavy lifting equipment.

Easy Installation

Plexiglass is very easy to drill, cut and shape with basic hand tools. No special diamond-edge blades or glass cutters are needed. Installation into a supporting frame or direct mounting into the window well walls is straightforward with standard screws, bolts and washers. Plexiglass is also very easy to attach using adhesives. These fabrication and installation advantages make plexiglass an ideal DIY material.

Transparency

Plexiglass has excellent optical clarity and light transmission properties. Clear plexiglass transmits up to 92% of visible light, keeping the window well bright while still providing protection. Colored plexiglass is also available for those wanting privacy or color effects. The high transparency of plexiglass is ideal for maximizing daylight through basement windows.

Weather Resistance

Plexiglass stands up very well to sun, rain, snow, sleet, high winds and temperature extremes. UV-stabilized grades can withstand years of sun exposure without yellowing or degradation. Plexiglass maintans its strength and impact resistance in cold weather far better than glass. Good weatherability makes plexiglass a great cover choice in any climate.

Low Maintenance

Unlike glass, plexiglass does not need frequent cleaning or sealing to maintain optimal visibility. Simple soap and water cleaning is only required a couple times per year. Plexiglass also resists scratching when proper care is taken. This means plexiglass window well covers will retain their like-new appearance with minimal work.

Safety

Plexiglass is safer than glass in window wells because it does not shatter into sharp shards if broken. Any plexiglass pieces would have blunt edges and corners. Plexiglass is also very scratch resistant so it maintains visibility rather than becoming obscured like scratched safety glass. The durability and transparency of plexiglass maximize safety for basement windows.

Considerations When Using Plexiglass

Plexiglass is highly durable and suitable for window well cover applications, but there are some considerations to keep in mind when using it:

• Strength – Plexiglass must be thick enough (usually 1/8” minimum) to span a window well without bowing or sagging.
• Support framing – Plexiglass performs best when installed in a supporting frame rather than relying solely on edge fasteners.
• Thermal expansion – Allow space for plexiglass to expand and contract to avoid buckling.
• UV exposure – Use UV-resistant plexiglass or coatings if sunlight will directly hit the cover.
• Condensation control – Allow ventilation to avoid drips from condensation buildup behind the cover.
• Scratch prevention – Handle plexiglass carefully and use soft cloths to avoid surface scratches.
• Cleaning – Use proper plexiglass cleaners rather than abrasive chemicals or brushes.

With smart design considerations and proper installation, plexiglass can create window well covers that are clear, durable, safe, and low maintenance.

Plexiglass Window Well Cover Design Tips

Here are some recommended design tips for effective plexiglass window well covers:

• Measure carefully – Field verify all window well dimensions and account for any irregularities.
• Frame supports – Incorporate an aluminum or PVC frame around the perimeter to support the plexiglass pane.
• Slope top panel – Angle the top plexiglass panel to encourage water runoff.
• Drainage holes – Drill a few drainage holes in the bottom of the frame to prevent moisture buildup.
• Vent gaps – Leave small gaps between panels or drill ventilation holes to allow airflow and reduce condensation.
• Smooth edges – Sand and polish cut plexiglass edges to prevent chipping and cracking at the holes.
• Backup washers – Use plastic washers behind all mounting bolt heads and nuts to prevent cracking from overtightening.
• Sealant – Apply neutral-cure silicone sealant around the edges for watertight installation.
• UV protection – Choose UV-resistant plexiglass or apply UV-filtering acrylic coatings to prevent long-term exposure damage.

Careful planning and design will result in plexiglass window well covers that are fully protective while looking great.

Installing a Plexiglass Window Well Cover

Once designed, plexiglass window well covers are relatively easy for DIYers to install. Here is an overview of installation best practices:

Materials Needed

• Plexiglass sheets cut to size
• Aluminum or PVC frame stock
• Stainless steel mounting hardware
• Neutral cure silicone sealant
• Plastic washers, vinyl tape, etc.

Steps for Installation

1. Clean and dry all window well surfaces thoroughly.
2. Test fit the plexiglass panels and frame in the opening. Make any final adjustments for accurate fit.
3. Drill any necessary holes in the plexiglass and frame pieces.
4. Apply sealant to one side of the window well frame then bolt it in place.
5. Place plexiglass panes into frame supports and bolt in place using plastic washers.
6. Apply sealant around outside edges of frames and over bolt heads for watertight finish.
7. Allow sealant to fully cure for 24-48 hours before exposing to weather.
8. Confirm drainage system functions properly.

Installing plexiglass window well covers is a relatively straightforward DIY project. Proper design and careful installation will result in long-lasting, highly functional covers. Maintain them properly and they can provide many years of reliable protection and visibility.

Costs of Plexiglass Window Well Covers

Plexiglass window well covers provide great durability and protection at reasonable costs:

Plexiglass Sheeting

The plexiglass sheets make up the largest cost of materials. An average 36″ x 24″ window well will require approximately 3 sheets of 1/8″ thick, UV protected plexiglass. At standard retail costs this is around $150-200 in materials.

Framing

Aluminum or PVC channel for framing will cost $50-100 depending on type and dimensions required. Stainless steel mounting hardware adds another $20-30.

Other Materials

Sealants, plastic washers, screws, tape, etc. will require around $20-30 in additional materials.

Total Project Costs

In total, DIY plexiglass window well covers cost $250-350 on average depending on the size. Additional labor costs apply if installing professionally. This is very comparable to glass covers.

Plexiglass is reasonably priced for window well covers, generally cheaper than glass. When factoring in the durability and longevity of plexiglass, it makes for a highly cost effective cover solution. Proper design and installation also allows the plexiglass to be removable for periodic cleaning or access to the well.

Maintenance Tips for Plexiglass Covers

Plexiglass requires very little maintenance when properly installed. Here are some tips for keeping plexiglass window well covers looking like new:

• Clean 2-3 times per year with mild soap and water. Avoid abrasive brushes or cleansing agents.
• Inspect sealant edges and refill gaps as needed to prevent water intrusion.
• Check for cracks or damage after major storms.
• Watch for condensation buildup and improve ventilation as needed.
• Reapply UV-resistant coatings per manufacturer instructions, typically every 2-3 years.
• Confirm all hardware is tight and frame remains properly secured.
• Remove debris and leaves from the well area to prevent blockage.
• Avoid placing heavy objects on or around the cover.

With routine inspections and cleaning, plexiglass window well covers will maintain full function for many years. The durability and weather resistance of plexiglass minimizes maintenance requirements compared to other cover materials.

Conclusion

Plexiglass is an excellent material choice for creating protective covers over vulnerable window wells. Plexiglass offers unmatched durability, clarity, and ease of fabrication compared to glass. It is lightweight and simple to install as a DIY project. Plexiglass window well covers provide safety, security, weatherproofing, and improved aesthetics at reasonable costs. They also require very little maintenance over time. With proper design and installation, plexiglass covers will provide lasting protection and visibility for any below-grade basement windows.