Lay Trex Decking Over Cement: A Comprehensive Guide

When it comes to transforming your outdoor space, the question of what surface to lay over your existing cement can be tricky. One trend gaining traction is the installation of Trex composite decking. But can you put Trex decking over cement?

This article will delve into the specifics of Trex composite decking installation, exploring whether it's feasible to place it over cement, the pros and cons of such an approach, and viable alternatives if cement-to-decking installation turns out to be unsuitable.

Understanding Trex Composite Decking

Trex is a brand name for a variety of eco-friendly, low-maintenance composite decking materials made from recycled polyethylene and reclaimed wood fiber. Due to its durability, aesthetics, and versatile design, Trex composite decking has quickly become a popular choice for homeowners and professionals alike.

However, the suitability of Trex or any other composite decking over cement largely depends on the specific decking system and best practices for installation.

Decking Type and Cement Compatibility

Trex offers various types of decking designed for different installations – some can go over existing concrete, while others are not recommended. Trex Transcend and Trex Enhance, for instance, can be used as 'deck over concrete' systems with proper preparation, but Trex Select, designed for building ground-level decks, is not suitable for cement installations.

Before you proceed, always check the specific product guidelines and consult a Trex expert to ensure the right product and installation method are used.

Concrete Preparation and Installation Considerations

For Trex decking that can be used over concrete, the preparation process is crucial. The cement surface must be flat, structurally sound, and free from any cracks or weeds. Begin by laying a flat, stable base such as plywood or solid core sleepers directly on the cement. These will help create a level, structurally sound surface for your decking.

Next, follow the manufacturer's instructions for-specific spacing and joist placement to ensure proper drainage and ventilation for your decking. Make sure to leave around 1/8 inch of space between the Trex boards for natural expansion and contraction due to temperature changes.

Advantages and Disadvantages of Trex Decking Over Concrete

Installing Trex over concrete comes with its set of pros and cons. Weighing these can help you make an informed decision.

Pros: Benefits of Trex Over Concrete

• Enhanced Aesthetic Appeal: Trex can greatly improve the look and feel of your outdoor space.
• Low-Maintenance: Unlike wood, Trex requires little maintenance, making it an excellent long-term investment.
• Durable and Long-Lasting: Trex composite decking is resistant to rot, insects, and extreme weather conditions, ensuring its longevity.

Cons: Drawbacks of Trex Over Concrete

While Trex has many benefits, there are some potential drawbacks to installing it over concrete.

• Moisture Trapping: Improperly prepared concrete can trap moisture, causing mold, mildew, and warping of the Trex boards.
• Cement Expansion: Concrete can expand and contract with temperature changes, potentially misaligning or breaking the decking.
• Cost: Trex decking and installation can be more expensive than alternatives, such as installing a permaBASE or wooden frame over the concrete.

Considering these pros and cons, it's clear that Trex decking can be installed over cement, but it requires careful planning, preparation, and understanding of the specific Trex product being used. Always consult Trex's official website or contact an expert for guidance tailored to your situation.

In the end, transforming your outdoor space with Trex decking can be a rewarding experience. By following best practices for decking over concrete and considering the specific needs of your project, you can create a beautiful, functional, and durable living space that you'll enjoy for years to come.