18 FT Pool Liner Pad Round Under Pool Padding - Puncture Protection

In this review of the 18 ft round pool liner pad, the reviewer finds a straightforward, practical underlay for above ground pools that focuses on protection and durability. It is aimed at homeowners who want a simple, no-fuss way to protect an 18 ft round pool liner from rocks, roots and other ground hazards. The single biggest reason to buy is its thick felt construction that provides cushioning and abrasion resistance so the pool liner below lasts longer.

Key Features

• Thick felt construction: The 2.5 mm, 300 g/m2 felt offers a dense cushioning layer that helps prevent punctures from sharp objects under the pool.
• Breathable material: The felt allows moisture to pass through so water does not get trapped beneath the pool floor and the liner remains cleaner.
• Pre-cut 18 ft round size: The pad measures 18x18 ft and fits an 18 ft round above ground pool without cutting, saving time during installation.
• Abrasion resistant: The durable, hard-wearing surface stands up to foot traffic and rough ground, protecting the metal parts and liner from corrosion and wear.
• Easy to install: The pad is simple to lay down before setting the sand barrier and liner, making it suitable for both soft-side and hard-side above ground pools.
• Versatile uses: Beyond pools, the felt pad can be repurposed as a protective ground layer for hot tubs, patios, camping gear or to cover outdoor items.

Who It's For

This product is best for homeowners or renters installing an 18 ft round above ground pool who want a protective underlayer that is quick to set down and does not require shaping. It suits both soft-side and hard-side pools and those who prioritize puncture protection and a flat base for the liner.

Those who need a custom-shaped pad for an odd-shaped pool or prefer a thicker rubber underlay for heavy-duty ground conditions may want to consider other options. Also, buyers requiring a waterproof barrier rather than breathable felt should look elsewhere.

Pros & Cons

Pros

• Thick, 2.5 mm felt gives reliable cushioning against ground debris.
• Breathable material prevents trapped moisture and helps prolong liner life.
• Pre-cut size fits 18 ft round pools with no cutting required.
• Lightweight and easy to handle during installation.

Cons

• Not fully waterproof, so it is not a substitute for a dedicated vapor barrier in very damp sites.
• Round pre-cut shape may require trimming for non-round or much smaller pools.

Specifications

Product type	Above ground pool liner pad
Size	18 ft round (18x18 ft)
Material	Felt
Thickness	2.5 mm
Weight	300 g/m2
Color	Black

Our Verdict

The 18 ft round pool liner pad is a practical, cost-effective choice for protecting an above ground pool liner from punctures and abrasion. Its thick, breathable felt construction and ready-to-fit size make installation easy, and it delivers good value for typical backyard pool installations when a breathable protective layer is desired.

Frequently Asked Questions

Will this pad fit my 18 ft round pool?
The pad is pre-cut to 18x18 ft and is designed to fit an 18 ft round pool without trimming.

Can the pad be cut for other pool shapes?
Yes, the felt material can be trimmed to fit oval, rectangular or irregular pool shapes if needed.

Is the pad waterproof?
No, the felt is breathable to allow moisture to pass through and is not a waterproof barrier; it is intended as a cushioning and abrasion-resistant underlay.