Choosing the right insulation means thinking long-term. While inexpensive solutions might seem like a good deal initially, they often result in unexpected expenses and performance issues later on. Some insulation doesn’t seal gaps properly or lacks safety assurances. That’s where expanded cork granules shine — they’re naturally tough, resist moisture, retain their shape, and come straight from the Earth.
Lightweight & Resilient
100% Natural Material
Top-Tier Insulation
Made to Last
Earth-Friendly Option
Safe & Non-Toxic
Got a question? Check out these helpful answers!
WHAT EXACTLY IS EXPANDED CORK GRANULATE?
Expanded cork granules are created by heating up natural cork until it expands and breaks into lightweight, porous pieces — which actually insulate better than traditional cork.
This process relies on nothing but heat — no chemicals needed. The cork bark swells and turns a dark brown color, and a natural binder called suberin is released during heating, helping the pieces stick together organically.
HOW DO PEOPLE USE IT?
It's widely used in the construction and insulation industries for applications like:
- insulating tight spaces in attics, walls, ceilings, and floors,
- filling cavities and voids between walls or inside partitions,
- pouring between rafters in pitched roofs,
- addressing uneven flooring or ceiling surfaces,
- under-screed or dry fill systems,
- lightweight flooring construction.
It’s also used beyond building projects, such as:
- bedding for reptiles in terrariums,
- natural mulch alternative in landscaping,
- TV and movie props to mimic rubble or debris,
- scale modeling and hobby scenery builds.
WHY CHOOSE INSULATION CORK?
One major benefit is its impressive thermal and sound insulation — it’s even more effective than standard cork.
Other great qualities include:
- Extremely light and doesn’t stress building structures,
- Naturally repels pests, mold, and fungus,
- Compatible with other materials — no reactions,
- Retains shape for the long haul,
- Long lifespan — performs for decades,
- Completely natural and biodegradable,
- Temperature resistant from –292°F to 248°F,
- Class E fire rating — doesn’t release harmful smoke.
IS IT SAFE TO USE?
Absolutely — it’s officially certified by the Polish National Institute of Public Health. That means it’s hypoallergenic, non-irritating, and completely safe to handle. We’re proud to be the only certified seller of this type in Poland.
IS CORK ENVIRONMENTALLY SUSTAINABLE?
Yes, 100%. Cork is harvested from the bark of cork oak trees — and the tree stays standing. It regrows naturally every 9–12 years, so there’s no harm done. These trees can live 200+ years while being harvested again and again.
Cork also has a carbon-negative footprint, meaning cork oaks soak up around four times more CO₂ than typical trees.
HOW LONG DOES IT WORK?
Expanded cork granulate maintains its insulating properties for up to 50 years, making it a great long-term investment.
WHAT COLOR IS IT?
The granules are deep brown due to the high-heat process — no dyes added. Compared to beige cork, the expanded variety looks raw and natural.
WHAT'S THE DENSITY LIKE?
For granules ranging from 2–9 mm, the average density falls between 70–80 kg/m³.
DO YOU ALSO SELL CORK PANELS?
Yes! You can find expanded cork boards available in our store as well.
IS CORK BETTER THAN FOAM INSULATION?
Foam might start strong, but it tends to break down — shrinking, cracking, and losing its insulating power over time. It also has a big environmental footprint.
Cork is a smarter alternative:
- It stays functional and solid for years,
- Made from natural, safe, non-toxic materials,
- Fights off mold, bugs, and mildew naturally,
- Breaks down naturally when no longer needed.
WHAT’S THE BEST WAY TO STORE IT?
Keep it dry and ventilated. Don’t store it in damp basements or outdoors under covers. Also avoid heat sources or direct sunlight.
To sum up: keep it dry, well-aired, shaded, and away from heat.
When people think "eco-friendly," they often imagine compromises in performance. But let’s get real – your home deserves top-tier protection. With expanded cork, there’s no trade-off. It’s not a trend or a gamble – it’s a smart, proven material that often outperforms synthetic options. Reliable and sustainable? Yes, you can have both.
#1 CORK DOES WHAT PLASTICS CAN’T
If you’ve ever used low-cost insulation made from synthetic materials, you probably know the headache that comes later. Sure, it might save you a few bucks upfront, but the long-term problems? Not worth it. Expanded cork flips the script. It’s a one-and-done installation – no adhesives, no mess, no maintenance.
Cheap fillers break down, clump, or warp over time. Cork stays consistent – loose, lightweight, and built to last. It doesn’t just fill space; it holds its form year after year without fail.
#2 GOING GREEN IS THE SMARTER MOVE
Look around – synthetic foams, plastics, and throwaway materials are everywhere. Most folks don’t realize the environmental cost behind them: energy-intensive production, pollution, and short lifespans. Expanded cork offers a cleaner path. It works with nature, not against it.
Here’s the kicker: cork trees don’t need to be chopped down. Their bark naturally regenerates for decades. While plastic-based products might seem budget-friendly, their long-term impact is anything but. Cork leaves no waste behind – and those trees actually absorb CO₂ from the atmosphere. That’s a win for you and the planet.
#3 THINK POPCORN – BUT COOLER
Heat cork up and it acts a bit like popcorn – expanding into a light, airy texture. No oil, no microwave – just heat doing its thing.
It all starts with cork bark, carefully harvested without damaging the tree. When exposed to high temps, cork cells expand and darken. During this natural process, the material releases suberin – a built-in bonding agent – so the granules stick together without glue.
The result? Outstanding thermal and acoustic insulation that beats standard cork in performance. Nature really knows how to innovate.
#4 LIGHTWEIGHT, SAFE & READY TO USE
Expanded cork granules are featherlight, which makes them easy to handle and pour into spots that rigid panels can’t reach. Great for tight corners and irregular surfaces.
Unlike many synthetic products that may off-gas or trigger sensitivities, cork is 100% non-toxic. It won’t irritate skin, eyes, or lungs. No VOCs, no allergens – just clean, natural material that gets the job done.
| Fraction | 2-9 mm |
| Volume | 1000 l (1 m³) - 70 kg |
| Color | Dark brown |
| Material | Expanded cork |
