The Feasibility of Composite Decking Over Cement Board

Introduction

Composite decking has become a popular choice for outdoor living spaces due to its durability, low maintenance, and aesthetic appeal. However, many homeowners wonder if they can lay composite decking directly over cement board. This article will detail the technical considerations and practical steps for installing composite decking over cement board, comparing this method with other decking installation techniques.

Technical Considerations

Installing composite decking over cement board requires careful planning and execution. The primary concern is ensuring that the surface is flat and free from debris. Cement board, typically used as a substrate for tile or other finishes, can provide a stable base for composite decking. However, it must be properly prepared before installation. This includes checking for any uneven areas or protrusions that could compromise the integrity of the deck.

Another critical consideration is the moisture content of the cement board. Composite materials are less susceptible to moisture damage compared to wood, but excessive moisture can still affect the performance of the decking. Proper waterproofing and ventilation are essential to prevent water accumulation underneath the deck.

Practical Steps for Installation

The process of laying composite decking over cement board involves several key steps:

• Surface Preparation: Clean the cement board thoroughly to remove dirt, dust, and loose particles. Use a primer to ensure better adhesion between the board and the composite decking.
• Drainage System: Install a proper drainage system to manage water runoff effectively. This helps in preventing water from pooling under the deck, which can lead to mold growth and structural issues.
• Fastening Method: Utilize appropriate fasteners designed for composite materials. These fasteners minimize the risk of splitting the composite boards and ensure a secure attachment to the cement board.

Comparison with Other Techniques

Installing composite decking over cement board offers several advantages over traditional methods such as attaching it directly to joists or using a subframe. One significant benefit is the reduction in labor costs since there’s no need to build a separate frame. Additionally, this technique can save space, making it ideal for smaller decks or balconies where structural modifications might not be feasible.

However, it’s important to note that while this method can work well, it may not be suitable for all situations. For instance, if the existing cement board is not perfectly level or if there are concerns about moisture management, alternative methods like building a frame might be more appropriate.

Conclusion

Installing composite decking over cement board is a viable option for creating an attractive and durable outdoor space. By following the outlined technical considerations and practical steps, homeowners can achieve a successful installation. While this approach offers benefits such as cost savings and space efficiency, it’s crucial to assess each project individually to determine the most suitable installation technique.

Reference

Family Handyman: How to Install Composite Decking Over Concrete