Granulated cork insulation

You can pick from these fractions: 2–4 mm, 2–9 mm, 4–8 mm, and 3–15 mm.

It’s a sustainable insulation material made from the bark of the cork oak tree—the very same bark used to make wine bottle stoppers. Expanded cork granulate comes in the form of irregular, lightweight granules with a rich dark brown hue.

Expanded cork is produced by heating natural cork to high temperatures without any chemical additives. During this process, a natural resin called suberin is released, which acts as a binder. As natural cork is heated, it darkens to a deep brown and expands in volume, creating a lightweight, “puffed” material. This gives it even better insulating properties than standard cork—it retains heat more effectively and provides superior sound absorption.

It’s most commonly used in construction—as a natural thermal and acoustic insulator. Since it’s loose-fill, it can be easily poured into spaces where mats or boards simply wouldn’t fit. It’s ideal for:

• insulating lofts, floors, walls, as well as hard-to-reach areas and narrow gaps (its loose form makes application simple),
• filling internal cavity walls, thermal insulation partitions, and cavity wall systems,
• pitched roofs (as loose-fill insulation between rafters),
• voids and hollow spaces beneath floors,
• filling gaps and levelling out uneven areas in ceilings and subfloors,
• dry screed systems,
• lightweight floor constructions.

Outside of construction, it also has a range of other uses:

• as a substrate in terrariums for exotic animals (it's 100% natural and completely safe),
• as a decorative mulch for plants and flowers (a sustainable alternative to pine bark),
• on film sets – used to mimic rubble or soil, especially in special effects for explosions or collapses,
• in model-making and dioramas – it realistically replicates the appearance of natural dark soil.

Yes, it holds an official Polish hygiene certificate issued by the National Institute of Public Health. This confirms that it does not cause allergies, irritation, or any adverse effects. At present, we are the only company in Poland offering cork granulate with this certification.

Up to 50 years—without any loss of insulating performance. It doesn’t absorb moisture, won’t develop mould, and doesn’t rot.