Shop Square 18-Foot Above Ground Pool Liner Pad — Precut Geotextile Underpad, Puncture Protection

Shop Square 18-Foot Pool Liner Pad is a precut geotextile underpad designed to protect above-ground pool liners from punctures and abrasion while improving liner life and installation stability.

Installing an underpad beneath your above-ground pool liner lowers the risk of punctures from small rocks, roots, or uneven ground and creates a smoother surface for the liner to rest on. The Shop Square 18-foot pad is made from recyclable geotextile material engineered to let moisture pass through while blocking sharp objects. It’s precut for convenience, easy to trim for a custom fit, and built to resist tearing and everyday wear.

How does this pad protect my pool liner?

The pad forms a durable physical barrier between the ground and your pool liner, absorbing abrasion and stopping punctures from sharp debris. Because it’s a geotextile fabric, it won’t trap water under the liner and still allows drainage to reduce pressure points.

• High-tensile geotextile resists cuts and tears
• Permeable weave allows moisture to escape beneath the liner
• Prevents contact with roots, rocks, and hard soil particles

Is the 18-foot size easy to install and trim?

Yes — the pad arrives precut to accommodate common 18-foot round pool dimensions, and the material trims cleanly with a utility knife or heavy scissors. It lies flat over prepared ground or a sand bed and does not require special tools or adhesives.

• Precut for standard 18-foot round above-ground pools
• Trim-friendly material for custom fitting around ladders or returns
• Compatible with both soft- and hard-sided pool frames

Will this pad last through seasons and outdoor conditions?

The Shop Square pad is designed from durable polymer geotextile that resists abrasion and maintains its barrier function over multiple seasons when installed properly. It’s not a permanent underground membrane but performs as a protective layer for the expected lifespan of most liners.

• Rugged construction tolerates foot traffic during setup
• Recyclable material engineered for outdoor use
• Breathable structure reduces trapped moisture buildup

How does the pad integrate with my pool setup routine?

Place a leveled sand or compacted soil base, spread the pad evenly, and then set your pool liner on top before assembling the pool frame. The pad helps create a consistent base and can be trimmed around fittings and corners for a neat finish.

• Lay pad after base preparation and before liner placement
• Works with sand or compacted soil beds for even support
• Simple trimming lets you route around returns, skimmers, and ladders

Who is this for: The Shop Square 18-Foot Pool Liner Pad is aimed at above-ground pool owners who want an affordable, easy-to-install protective layer that extends liner life and reduces puncture risk. It’s well suited for DIY installers, seasonal pool users who assemble and disassemble, and anyone preparing a new pool site where soils may contain roots, stones, or uneven spots. If you’re looking for a recyclable, low-maintenance underpadding that simplifies setup and adds a practical safeguard for your liner, this pad is a practical choice.