SlabCore insulation is engineered to deliver high-performance thermal efficiency beneath concrete slabs while maintaining the strength and durability required for modern foundation systems. Designed to work seamlessly with the CodeMark-approved QPOD™ Foundation System, SlabCore provides consistent insulation performance across the entire slab area while supporting construction loads during installation.

Manufactured from closed-cell extruded polystyrene, SlabCore offers low thermal conductivity and high compressive strength relative to its thickness. This makes it an ideal underslab insulation solution for projects requiring improved thermal performance without compromising structural reliability. Available in multiple thicknesses and densities, SlabCore allows designers to easily achieve required R-values while maintaining a simple and practical installation process on site.

Your Thermal Advantage

SlabCore™ XPS insulation delivers reliable thermal performance beneath concrete slabs through its low thermal conductivity of 0.027 W/mK and high resistance to moisture absorption. 

Available in a range of thicknesses, SlabCore allows designers to achieve the required thermal performance for a project without adding unnecessary slab depth.

SlabCore XPS

SlabCore XPS is an extruded polystyrene sheet. It’s closed-cell structure prevents water penetration and delivers impressive strength and durability, making it an ideal interior and exterior insulation solution that’s ideal for retaining walls, underslab insulation, interior cladding, and masonry walls.

SlabCore insulation is available in a range of thicknesses, allowing designers to achieve the thermal performance required for each project. The R-value increases proportionally with sheet thickness.

This chart outlines the typical R-values across the SlabCore thickness range, the XPS based on 40 kg/m³ and VH EPS based on 30 kg/m³.

SlabCore XPS is engineered for long-term performance beneath concrete slabs, with a 50-year warranty supporting its durabilit. Manufactured as a rigid extruded polystyrene with a closed-cell structure, it significantly limits water absorption, helping preserve both thermal conductivity and mechanical properties over time.

This resistance to moisture ingress and load-related creep supports consistent in-service performance, even in environments exposed to variable ground moisture conditions.

By retaining its insulation capability and structural reliability over the life of the building, SlabCore contributes to long-term compliance with thermal requirements while reducing the risk of performance degradation beneath the slab. The result is a foundation insulation layer guaranteed to last 50 years when the product has been installed and used correctly.

Benefits Include:

QPOD SlabCore provides the following benefits for underslab insulation applications:

• 50 year warranty when installed and used correctly

• High thermal performance with low thermal conductivity (0.027 W/mK)

• High R-value relative to sheet thickness

• Strong compressive performance for underslab environments

• Closed-cell structure preventing water absorption

• Clean and simple installation with minimal on-site mess

• Supplied in manageable 600mm × 2400mm sheet sizes

• Multiple thickness options available to suit project R-value targets

• Can be delivered to site alongside your QPOD foundation system for simplified procurement