Granulated cork insulation

It’s an insulating granulate designed for filling cavities and voids. Made from the bark of the cork oak — the same natural material used for wine stoppers or pin boards — it expands when exposed to high temperatures, increasing its volume. As the granules swell, they darken and develop enhanced thermal insulation properties. No synthetic binders are used in the process: heat releases suberin, a natural component of cork bark, which acts as a binding agent.

Expanded cork granules are used wherever traditional insulation boards fall short — in irregular spaces, floor voids and hard-to-reach recesses.

It’s a great choice if you:

• have a loft with awkward corners that are difficult to insulate using conventional materials,
• have empty cavities in walls or ceilings that can’t easily be filled with boards (such as cavity walls, internal double walls or insulated partitions),
• have a pitched roof and want to fill the space between the beams,
• have voids beneath the floor that are difficult to insulate,
• need to top up insulation, fill gaps or level out areas where standard insulation simply doesn’t work.

Keep in mind, however, that cork granules are not a structural material — they won’t replace a screed or rigid board. They’re also not suitable where a perfectly smooth finished surface is required.

If you’re not sure whether cork granules are right for your project, just get in touch — we’ll be happy to help!

First of all, it insulates against both heat and sound even more effectively than standard cork. Secondly, it comes with a range of additional qualities that make it efficient, user-friendly and highly practical.

It’s a material that:

• doesn’t add unnecessary load to the structure thanks to its lightweight nature,
• is resistant to mould, fungi and insects,
• doesn’t settle over time, so you don’t lose insulation performance after a few years,
• is natural and biodegradable.

From our experience, expanded cork clearly outperforms mineral wool in real-world applications.

Expanded cork is a highly effective insulation material — it provides excellent protection against heat loss and noise. It doesn’t absorb moisture, doesn’t settle over time and retains its properties for many years, keeping the insulation durable and stable. Mineral wool may be cheaper, but it often loses its performance much faster than cork.

On top of that, expanded cork is completely natural, renewable and safe for health. It releases no toxins or irritating fibres, and its production has a significantly lower carbon footprint compared to mineral wool.