For any pool owner, the decision to close the pool for the season marks a significant shift in maintenance priorities. Instead of focusing on clarity and warmth, the goal shifts to preservation and protection against the elements. A critical, yet often overlooked, component of this process is the secure storage of the pool cover, which is where a dedicated DIY underground pool blanket box becomes an essential project.
While above-ground storage totes are common, they present several issues, including unsightly visual clutter, vulnerability to punctures, and the constant task of removing and replacing the lid. An in-ground solution eliminates these frustrations, providing a seamless integration into the landscape that keeps the pool accessories safe, dry, and ready for use. The following guide outlines the precise steps and considerations required to build your own high-functioning blanket box.
Planning Your Box Location and Dimensions
Before cutting a single piece of lumber, you must determine the optimal placement. The ideal location is near the pool equipment pad or a convenient access point, but away from downspouts that could funnel water into the box. Measuring the length and width of your pool cover is the foundational step; you need enough clearance to easily roll the cover onto the reels without fighting the walls of the box.
It is generally recommended to add at least 12 to 18 inches to the length and width of the cover for interior clearance. Furthermore, consider the depth of the box. A standard design will sit level with the ground, requiring a excavation depth of approximately 14 to 18 inches to accommodate the structure and allow for proper drainage. This planning phase is critical to ensuring the final structure is both functional and aesthetically pleasing.
Material and Hardware Specifications
The durability of the box is directly tied to the quality of the materials used. For a structure that will withstand constant exposure to moisture and UV rays, pressure-treated lumber is the non-negotiable standard. Avoid using standard pine, as it will succumb to rot and warping far too quickly. The typical construction relies on 2x6 or 2x8 boards for the walls, providing the necessary structural integrity.
| Material | Purpose | Specification |
|---|---|---|
| Pressure-Treated 2x6s | Frame & Wall Structure | Standard construction lumber |
| Treated 4x4 Posts | Reinforcement | Corner bracing for rigidity |
| Marine-Grade Plywood | Base & Lid | Exterior-grade for moisture resistance |
| Heavy-Duty Hinges | Lid Operation | 3-inch stainless steel hinges |
| Waterproof Sealant | Protection | Polyurethane or roofing sealer |
Step-by-Step Construction Process
Begin by constructing the rectangular frame on a flat, stable surface. Use galvanized or stainless-steel screws designed for outdoor wood projects to assemble the walls, ensuring the corners are perfectly square. Attaching the 4x4 corner posts at this stage will anchor the frame and keep it rigid during the assembly of the base.
Once the frame is secure, lift the marine-grade plywood base into place and fasten it to the frame. The lid is constructed similarly but is attached using the heavy-duty hinges. Mount the hinges to the back of the frame and the underside of the lid, allowing the box to open fully without obstruction. This simple mechanism is vital for transforming a storage container into an accessible storage solution.
Critical Drainage and Waterproofing
Perhaps the most important detail often missed by DIY enthusiasts is the need for adequate drainage. Water accumulation at the bottom of the box will inevitably lead to mold and wood degradation. To combat this, you must install a simple drainage system.
Drill several 1/2-inch holes in the bottom of the plywood base before installation. Surround these holes with a layer of crushed stone or pea gravel to prevent the drains from clogging with sediment. Additionally, apply a generous coat of waterproof sealant to the cut ends of the lumber and all interior joints. This step ensures that moisture is repelled, significantly extending the life of the structure.
Finishing Touches and Long-Term Care
With the structure complete and dry, the final step is aesthetics and camouflage. Painting the box to match the surrounding landscape or the color of your home’s siding helps it blend into the environment rather than look like a necessary evil. Opt for a high-quality exterior paint to protect the wood from fading and chipping.
To maintain the functionality of the box, avoid storing the cover while it is still dripping wet. Allow the cover to dry thoroughly on a line before placing it inside the box to prevent mildew formation. By following these professional-grade steps, you create a permanent, reliable storage solution that protects your investment and keeps your pool area organized year-round.
