Transform Old Deck: Can You Cover Wood with Trex Composite?

Considering the longevity and low maintenance of Trex, it's no wonder homeowners are contemplating whether they can cover an existing wood deck with it. Before you proceed, let's explore the intricacies of this process, the benefits, potential challenges, and a simple step-by-step guide to help you make an informed decision.

Trex, a composite material made from a blend of recycled plastic and reclaimed wood fibers, has become a popular alternative to traditional wood decking due to its stain and fade resistance, durability, and low maintenance. However, before you make the switch, it's crucial to understand the implications of replacing wood decking with Trex.

Evaluating Your Existing Wood Deck

Before you decide to cover your existing wood deck with Trex, you need to assess its current condition. If your wood deck is structurally sound and well-maintained, it might be a viable base for Trex. However, if it's rotting, warping, or has significant insect damage, it's best to replace the entire structure instead of trying to cover it.

A well-constructed, sturdy wood deck with minimal damage can potentially become the base for your new Trex deck, saving you time and money. But ensure that the wood decking boards are closely spaced (no more than 1/4" between boards) to allow Trex's irreversible fasteners to grip properly.

Matching Joist Spacing

Trex is designed to be installed on joists spaced 16" on center. If your existing wood deck has joists spaced at a different interval, you'll need to adjust them to match Trex's requirements. Failing to do so can compromise the structural integrity of your deck and result in a buckling or sagging surface.

To match your joist spacing to Trex's requirements, you might need to add or subtract joists, adjust the spacing of existing joists, or add blocking between joists for added support.

Adjusting Deck Height

Trex board dimensions vary from traditional wood decking. To ensure a level surface, you might need to adjust the height of your existing deck frame. This could involve adding or removing joists, adjusting beam heights, or using shims to level the surface.

It's essential to note that Trex boards are thicker than most wood decking boards. So, you might need to adjust your railings and stairs to accommodate the increased thickness.

Benefits of Covering an Existing Wood Deck with Trex

Transforming your wood deck into a Trex deck comes with numerous benefits. Chief among these is the significant reduction in maintenance. Unlike wood, Trex requires no sanding, staining, or sealing. It's also resistant to rot, termites, and other wood-destroying insects, ensuring its longevity.

Trex offers fantastic value for money in the long run. While the initial installation cost might be higher than wood, its longevity and low maintenance make it a cost-effective option in the long run. Moreover, Trex boards come with a 25-year limited residential fade and staining warranty, and a 25-year limited residential warranty against rot, decay, and insect damage.

Environmental Benefits

Opting for Trex over traditional wood decking can also have a positive impact on the environment. Trex boards comprise a combination of recycled plastic and reclaimed wood fibers, making it an eco-friendly alternative to wood.

Moreover, Trex's durability reduces the amount of waste from deck replacements. According to the manufacturer, for every 500 linear feet of Trex decking produced, 40,000 square feet of pressure-treated timber is conserved, and 168,000 plastic bags are kept out of landfills.

Enhanced Aesthetics and Increases Home Value

Trex boards come in a variety of colors, patterns, and textures, allowing you to customize your deck to match your home's exterior. The material also minimizes the appearance of scratches and dents, maintaining its clean appearance even with heavy use.

A well-designed Trex deck can significantly enhance your home's curb appeal and increase its resale value. According to a report by the National Association of Realtors, homeowners who undertook a wood deck replacement project recouped, on average, 63.2% of their project costs when they sold their homes.

Potential Challenges and Drawbacks

While covering an existing wood deck with Trex has several benefits, it's not without its challenges. The process can be labor-intensive and may require you to adjust your existing deck frame. Moreover, it's crucial to stress that Trex's manufacturers do not recommend covering existing wood decks with their product.

Trex decks should be built on a new, sound, and structurally adequate frame. Capping an existing wood frame with Trex can void the product's warranty. If you're considering a DIY project, it's essential to weigh the potential cost savings against the risk of damaging your Trex investment.

Warranty Concerns

As mentioned earlier, Trex does not support covering an existing wood deck with their product. Installing Trex boards on an existing wood frame can void the product's warranty. If you're considering a professional installation, ensure your contractor follows Trex's installation guidelines to avoid potentially costly warranty issues.

Moreover, covering a wood deck with Trex might create an ideal environment for mildew and mold growth. The wood below the Trex boards can retain moisture, leading to fungal and bacterial growth, which can compromise the structural integrity of your deck.

Potential Difficulties in DIY Installation

If you're considering a DIY installation, it's essential to note that the process can be more complex than installing Trex on a new frame. You'll need to adjust your existing deck frame to match Trex's installation requirements, which can be challenging for inexperienced DIYers.

The process may also require you to purchase additional Trex boards to ensure you have enough material to accommodate the adjustments to your existing frame. This can significantly increase the cost of your project and negate the potential cost savings of capping an existing wood deck with Trex.

In the case of historic homes or homes in areas with strict zoning or historic preservation regulations, converting a wood deck to a Trex deck might not be allowed. Always check with your local building department and any relevant historic preservation societies before beginning any renovation project.

If, after considering all these factors, you're still keen on transforming your wood deck into a Trex deck, it's crucial to proceed with caution. Ensure you thoroughly assess your existing deck's condition and follow Trex's installation guidelines closely. It's also a good idea to consult with a professional installer or, at the very least, have them inspect your existing deck and provide a professional opinion.

Ultimately, while covering an existing wood deck with Trex can be an appealing option, it's essential to approach the project with a clear understanding of the potential benefits and challenges. By proceeding with careful consideration and expert guidance, you can transform your wood deck into a durable, low-maintenance, and eco-friendly Trex deck that will serve you well for years to come.