Owning a swimming pool brings immense joy, but it also comes with the ongoing responsibility of protection and maintenance. A pool cover is one of the most important investments you can make to safeguard your investment, yet many owners are unsure about the surface that lies beneath it. Putting the right material under your pool cover is not just about convenience; it is a critical step in extending the life of the cover, protecting the pool shell, and ensuring a safe and clean swimming environment all year round.
The Importance of the Underlying Surface
The space between your pool cover and the pool deck might seem inconsequential, but it plays a significant role in the overall effectiveness of the cover system. The right substrate provides a stable and flat base that prevents the cover from sagging or collecting water in pockets. Without proper support, a cover can become a burden, leading to premature wear, tearing, and difficulty in handling. Furthermore, the surface acts as a barrier, stopping ground moisture, dirt, and debris from working their way up and dirtying the clean side of the cover.
Level and Solid Ground
Before considering specific materials, the ground itself must be assessed. The primary requirement for anything placed under a pool cover is that it is level. An uneven surface will create pressure points that can tear the vinyl or cause the cover to slip off the track. The area should also be solid; soft, muddy, or shifting ground will defeat the purpose of a protective layer. If your pool area has unstable soil or tends to pool water, addressing drainage or using a crushed stone base is essential before adding a cover system.
Common and Effective Under-Cover Materials
Several materials are specifically designed to handle the weight of snow, the stress of wind, and the friction of sliding covers. The choice often depends on your climate, budget, and the type of cover you use. Here are the most popular options trusted by pool owners:
1. Vinyl or Mesh Cover Tracks
If you have a hard-sided cover, such as a solid safety cover, the track system is the standard solution. These tracks are mounted directly to the coping around the pool and are designed to anchor the cover securely. The surface under the track is usually the pool deck itself, which is typically concrete or pavers. Ensuring the track is properly mounted and free of debris is the most direct way to protect the cover's anchor points.
2. Foam Pool Cover Cushions
For above-ground pools, foam cushioning is a highly recommended solution. These foam strips or noodles are placed on the top rail of the pool wall, underneath the cover liner. They act as a shock absorber, protecting the cover from constant abrasion caused by wind movement. Additionally, they help displace the weight of accumulated snow and rain, preventing the cover from straining against the wall and potentially ripping the seams.
3. Ground Cloth or Tarp (Use with Caution)
While using a generic plastic tarp might seem like a budget-friendly idea, it requires specific precautions to avoid damaging the cover. If moisture is trapped between the tarp and the cover, it can create a slipping hazard and foster mold growth. To do this correctly, you should use a breathable ground cloth or even repurposed carpet scraps. These materials provide grip and protection without creating a slippery water trap, ensuring the cover stays put and stays dry.
Winterization and Protective Layering
In regions that experience freezing temperatures, what you put under the cover becomes a matter of safety and structural integrity. You do not want the weight of a snow-filled cover to stress the pool walls or supports. In these scenarios, air pillows are the industry standard. These large airbags are placed under the cover in the center of the pool. They are designed to flex as the ice expands, absorbing the pressure and preventing the cover from being pushed inward or tearing. Combining an air pillow with a breathable pad offers the best defense against the harshest winter conditions.
Routine Maintenance Beneath the Cover
Even with the best materials installed, the area under the cover requires periodic attention. Leaves and debris can settle on the surface, creating a slipping hazard and staining the cover. Wind can also find its way underneath, depositing dirt and grit. To mitigate this, ensure that any protective pad or foam is smooth and that the cover is pulled taut. Regularly clearing debris from the surface of the cover—using a broom or a leaf blower on the lowest setting—prevents unnecessary weight and reduces the wear caused on the underside of the vinyl.
Summary of Recommendations
Selecting the right foundation for your pool cover is about balancing protection, functionality, and cost-efficiency. For in-ground pools, a simple concrete pad or landscaping fabric usually suffices. For above-ground pools, foam noodles are essential for protecting the liner. If you face heavy snow loads, integrating an air pillow is non-negotiable. By understanding the role of the surface beneath your cover, you ensure that your pool remains cleaner, your cover lasts longer, and the opening and closing process remains safe and straightforward season after season.
