💠 Underliner 5 mm – Pool Floor and Wall Protection (per sqm)

The Underliner 5 mm is a protective felt layer designed to be installed beneath PVC pool liners to provide a smooth, cushioned, and protective base.
Made from high-density, non-woven polyester fibres, it ensures extra durability, protects against abrasion and punctures, and improves thermal insulation between the liner and pool shell.

This material is ideal for use with PVC beaded liners, overlap liners, or reinforced membranes in both residential and commercial pool installations.
The 5 mm thickness provides an optimal balance between comfort, flexibility, and mechanical protection.

✅ Key Features

• 5 mm thick protective felt for pool walls and floors

• Prevents liner damage from rough surfaces or minor imperfections

• Improves liner comfort and appearance by creating a smooth base

• Adds thermal insulation and reduces heat loss through the pool structure

• Made from rot-proof, high-density polyester fibre

• Resistant to pool chemicals and moisture

• Easy to cut, handle, and install

• Supplied per square metre (sqm)

⚙️ Technical Specifications

• Product type: Underliner for swimming pool liners

• Material: Non-woven polyester fibre

• Thickness: 5 mm

• Density: Approx. 250–300 g/m²

• Colour: Grey (mixed fibres)

• Format: Supplied per square metre (sqm) or full roll

• Compatibility: All PVC liner types and pool structures (concrete, steel, panels, wood)

• Temperature range: 0 – 50 °C

• Installation: Placed directly on pool walls and floor before liner fitting

📍 Typical Applications

• In-ground and above-ground pools

• Private and commercial installations

• Liner replacement and renovation projects

• PVC, reinforced, and overlap liner systems