Choosing the right insulation isn't just about finding the cheapest option. While low-cost materials might seem like a smart deal upfront, they can often lead to headaches and additional expenses down the road. Plus, not every product fits tight spaces or meets safety requirements. That's why expanded cork insulation stands out – it's durable, moisture-resistant, dependable, and environmentally sound from start to finish.
Strong & Lightweight
100% Natural Composition
Premium Insulating Power
Built to Last
Eco-Conscious Manufacturing
Safe for All Applications
Have questions? We’ve got the info you need.
WHAT IS EXPANDED CORK INSULATION MADE OF?
It’s composed of expanded cork granules—a lightweight, all-natural material that delivers superior insulating performance compared to standard cork.
The cork is harvested from cork oak trees and undergoes a high-temperature process that causes it to expand and darken naturally—no chemicals involved. The transformation is possible thanks to suberin, a substance in cork that acts like a natural binder when exposed to heat.
WHERE CAN YOU USE EXPANDED CORK GRANULES?
They're commonly used in construction applications, such as:
- insulating attics, ceilings, floors, and walls – perfect for awkward areas,
- filling voids in cavity walls or hollow panels,
- pitched roofing – loosely placed between rafters,
- floor gaps and crawlspaces,
- leveling uneven subfloors or ceilings,
- dry screed applications,
- lightweight underlayment systems.
They're also popular outside of construction, including:
- terrariums – safe and natural bedding for reptiles and small pets,
- landscaping – a stylish, sustainable mulch alternative,
- movie production – realistic debris or soil stand-in,
- model making – ideal for terrain and miniature structures.
WHY IS EXPANDED CORK A STANDOUT INSULATOR?
For starters, it delivers excellent thermal and acoustic insulation. It performs better than traditional cork when it comes to both sound and temperature control.
Additional key benefits include:
- Extremely lightweight – adds no structural burden,
- Naturally mold-, pest-, and fungus-resistant,
- Chemically inert – no risk of reactions,
- Shape-stable – no shrinking or warping over time,
- Remarkably durable – holds up over the decades,
- Biodegradable and environmentally responsible,
- Performs in extreme temperatures – from –292°F to 248°F,
- Rated Euroclass E for fire behavior.
IS EXPANDED CORK SAFE TO USE?
Yes, absolutely. This product has been certified by the Polish National Institute of Public Health. It’s allergy-friendly and won’t cause skin irritation. At present, we are the only certified distributor of this particular grade in Poland.
IS NATURAL CORK AN ECO-FRIENDLY MATERIAL?
Yes, it is. Cork is harvested from trees without damaging them—the bark regenerates naturally every 9 to 12 years. A single cork oak can continue producing for over 200 years!
Cork also contributes to a carbon-negative footprint. These trees absorb up to four times more CO₂ than the average species.
HOW LONG DOES THIS INSULATION LAST?
When installed properly, expanded cork insulation can retain its performance characteristics for as long as 50 years.
WHAT COLOR IS EXPANDED CORK?
It has a rich, dark brown hue—the result of the heating process. No dyes or artificial coloring are added, which gives it a raw, earthy aesthetic.
WHAT IS THE DENSITY OF THE GRANULES?
Granules ranging from 2–9 mm typically have a density of around 70–80 kg/m³ (4.4–5.0 lb/ft³).
IS IT AVAILABLE IN PANEL FORM?
Yes, you can also get expanded cork as rigid sheets for thermal insulation.
HOW DOES IT COMPARE TO FOAM INSULATION?
Foam insulation is synthetic, prone to deterioration, and contributes to greenhouse emissions. Over time, it can lose its airtight seal or break down entirely.
Expanded cork, on the other hand:
- Lasts significantly longer than standard foam,
- Is chemical-free and safe for people, pets, and the planet,
- Naturally immune to mold, pests, and rot,
- Is biodegradable and leaves a negative carbon impact.
WHAT’S THE BEST WAY TO STORE IT?
Keep the material dry and in a well-ventilated area. Avoid humid basements, outdoor tarps, and direct sunlight or heat sources.
Bottom line: store it in a cool, dry, and shaded space with good airflow.
Many folks think going green means settling for less. But let’s be real — your home isn't where you want to cut corners. Expanded cork isn’t a gamble — it’s a proven, high-performance material that beats synthetics hands-down. You don’t have to choose between eco-friendly and effective — you get both.
#1 NATURAL WINS OVER PLASTIC
If you’ve ever picked up cheap foam insulation, you know the deal — it might save you a buck at first, but it usually doesn’t hold up. Expanded cork plays by different rules. Once it’s installed, it stays put — delivering consistent performance for the long haul.
Some materials just can’t cut it when it comes to granules — they break apart, clump up, or lose form. Expanded cork stays loose and reliable. Lightweight, stable, and steady. This isn’t about stuffing a hole — it’s about long-term insulation that works year after year.
#2 GREEN THINKING IS JUST SMART LIVING
We’re surrounded by plastic, polystyrene, and synthetic foams — and most of it ends up in landfills or polluting nature. What’s worse, the energy used to make them is sky-high. The trade-off? Quick fixes with long-term damage. Expanded cork changes the game — it works with nature, not against it. No mess. No toxins. Just sustainable living.
And here’s the wild part — cork trees naturally regrow their bark. No chopping, no destruction. Yet we still default to plastic. Sure, it looks cheaper, but the environmental price is steep. Cork flips the script. No waste. And those trees? They suck up serious amounts of CO₂ — fighting climate change with zero downsides.
#3 THE POPCORN EFFECT
When you heat corn, it pops. Cork acts in a surprisingly similar way — no oil, no microwave, just pure science.
It all starts with cork oak bark. Experts remove it carefully so the tree stays healthy. Then it’s heated to high temps. The cork expands, darkens, and swells. Suberin — a natural plant-based binder — kicks in to hold it all together.
This process creates seriously powerful insulation. It locks in warmth, blocks out noise, and works better than you’d expect from something so natural.
#4 LIGHTWEIGHT, FLEXIBLE & 100% SAFE
Expanded cork granules are super light — easy to haul, easy to install, and perfect for weird corners where traditional boards just won’t fit.
Unlike foam or fiberglass, cork won’t irritate your skin or your lungs. It’s hypoallergenic, VOC-free, and completely safe for your family — and your pets too.
| Fraction | 2-9 mm |
| Volume | 120 l (0,12 m³) - 10 kg |
| Color | Dark brown |
| Material | Expanded cork |
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