Can You Lay Composite Decking Over Concrete?

Introduction

Composite decking has gained significant popularity in recent years due to its durability, low maintenance requirements, and aesthetic appeal. While many homeowners opt for traditional wooden decks, composite decking offers a more sustainable alternative that can last longer with minimal upkeep. However, one common question that arises is whether it’s feasible to install composite decking directly over concrete surfaces. This article will explore the process of laying composite decking over concrete, discussing the necessary steps for surface preparation, moisture control, and weighing the pros and cons of this approach.

Surface Preparation

The first step in laying composite decking over concrete is ensuring that the concrete surface is properly prepared. The concrete should be clean, flat, and free from any debris or contaminants. Any cracks or uneven areas need to be repaired using appropriate fillers. It’s also important to inspect the concrete for any signs of moisture damage, which could affect the longevity of the composite decking. Proper surface preparation is crucial for ensuring a strong bond between the concrete and the composite decking materials.

Moisture Control

One of the biggest challenges when installing composite decking over concrete is managing moisture levels. Concrete can retain moisture, which can lead to issues like mold, mildew, and warping of the composite material. To address this, it’s recommended to use a moisture barrier or underlayment between the concrete and the composite decking. This layer helps to prevent water from seeping into the composite boards, reducing the risk of damage over time. Additionally, proper drainage around the deck area is essential to ensure that water doesn’t accumulate and cause problems.

Advantages and Disadvantages

Laying composite decking over concrete offers several advantages, including increased durability and reduced maintenance needs. It can also enhance the aesthetic appeal of outdoor spaces by providing a modern, sleek look. However, there are also some drawbacks to consider. For instance, the process can be more complex and expensive compared to traditional wooden decks. Moreover, if not installed correctly, moisture-related issues can arise, potentially leading to costly repairs in the future.

Conclusion

While it is possible to lay composite decking over concrete, careful planning and execution are required to ensure a successful installation. By addressing surface preparation and moisture control, homeowners can enjoy the benefits of composite decking even on concrete surfaces. However, it’s important to weigh the advantages against potential drawbacks before proceeding with this approach.

Reference

How to Lay Composite Decking Over Concrete, Family Handyman.