Koolfoam UnderSlab

Warmer Floors. Smarter Performance.

When your project calls for thermal efficiency, structural integrity and long-term reliability, Koolfoam UnderSlab Insulation delivers. Built for New Zealand conditions and engineered to perform, it creates a warmer, drier and more energy-efficient building from the ground up.

Koolfoam UnderSlab Insulation offers excellent compressive strength, is moisture resistant, and delivers outstanding thermal performance. With a 50-year warranty when installed and used correctly, it is available in multiple size, strength, and thermal performance options.

Where can it be used?

Koolfoam UnderSlab Insulation is ideal for residential concrete floor slabs, commercial and industrial buildings, architectural homes requiring higher thermal performance, underfloor heating systems, and foundations where thermal efficiency and strength are equally important.
Koolfoam EPS and XPS sheets can also be used for masonry wall insulation, cladding, lightweight fill, and skillion roof insulation, making them a versatile solution across a wide range of building applications.

Choosing The Right Grade

EPS Grade Options

S Grade EPS

Designed for residential slabs and general building applications needing reliable insulation and support.
With a minimum compressive strength of 85kPa, it reduces heat loss while providing strong, durable performance for everyday concrete floor systems.

H Grade EPS

Built for projects requiring greater strength and thermal performance.
With a minimum compressive strength of 135kPa, it suits heavier residential builds, light commercial projects and architectural homes needing stronger support and lasting insulation.

VH Grade EPS

The premium high-strength option for demanding applications.
With a minimum compressive strength of 165kPa, it is ideal for heavier loads and commercial buildings where maximum durability, thermal efficiency and long-term performance are essential.

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