Cork and Coconut Insulation

Qualycork supplies insulation products made from expanded cork and coconut fibres for thermal and acoustic applications in buildings. The materials are fully bio-based and derived from renewable natural resources.

Expanded cork is produced from cork oak bark, harvested without damaging the tree. The granules are expanded using steam, activating the cork’s natural resins so that no synthetic binders are required. The material has a thermal conductivity of approximately 0.040–0.043 W/mK, depending on density. It is vapour-permeable, water-repellent and resistant to rot and pests, and testing indicates stable insulation performance over time.

Boards are available in different densities and thicknesses, including façade-grade variants. Typical applications include pitched and flat roofs, external walls, floors and attic constructions. Expanded cork is also available as loose granules for cavity infill.

Coconut fibre insulation is derived from coconut husks and is primarily used for acoustic performance. In combination systems with cork, it broadens the range of absorbed sound frequencies. Coconut insulation has a thermal conductivity of approximately 0.043 W/mK and provides impact and airborne sound reduction.