ISOLENA – Klemmfilz
£106.92 – £126.72Price range: £106.92 through £126.72
ISOLENA Klemmfilz is a 100% sheep wool insulation with a thermal conductivity of 0.033 W/mK, delivering breathable, high-performance thermal and acoustic comfort. Durable, biocide-free, and fully sustainable with Ionic Protect®.
ISOLENA Klemmfilz is a high-performance natural insulation made from 100% pure sheep wool, providing a sustainable, breathable solution for both thermal and acoustic applications. Manufactured without synthetic additives or supporting fibres, and enhanced with biocide-free Ionic Protect®, it delivers long-term durability while supporting a healthy indoor environment.
Suitable for internal walls, partition walls, ceilings, and service zones, this versatile insulation works seamlessly in both modern construction and heritage buildings where vapour permeability and material compatibility are critical.
Produced from a fully renewable resource, Klemmfilz is reusable, recyclable, and certified with the NaturePlus eco-label, demonstrating its commitment to the highest environmental standards.
100% pure wool with full Ionic Protect® protection.
Ionic Protect® is an advanced, biocide-free wool protection system, independently tested to EAD/CUAP standards, offering a proven ecological and durable solution without compromising performance.
The innovative wool protection process video
ISOLENA Sustainability
Wool is a naturally occurring fibre, which means it is a renewable raw material and can be a sustainable choice when responsibly sourced. In lifecycle assessments, emissions are often measured across stages such as A1–A3 (covering raw material supply, transport, and manufacturing). It is also durable and adaptable at end of life: it can often be reused as insulation, recycled into other products, or biodegraded under suitable conditions.
With a thermal conductivity of 0.033 W/mK, Klemmfilz provides excellent insulation performance, while its high specific heat capacity of 1760 J/kgK helps regulate internal temperatures, reducing the risk of overheating in summer months.
| High Performance | Klemmfilz is a highly effective insulation roll with a superior thermal performance over almost all natural and man-made fibre insulation products. Klemmfilz is made of pure new wool fibres, which hold their shape and thickness right throughout their lifetime. Being produced from 100% pure wool fibres, Klemmfilz is a fully breathable material that will maintain it’s thermal efficiency even in the harshest climates. The high density of wool fibres in Premium make it an excellent acoustic as well as thermal insulation. |
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| Safe & Healthy | Klemmfilz is a safe material, not only to handle and install, but to have within your home. Wool fibres are completely safe to touch and work with, requiring no special handling or protective equipment. Klemmfilz insulation rolls can be installed on top of existing glass or mineral wool, reducing the opportunity for their potentially hazardous particles to become airborne. Due to it’s high moisture content, wool does not support combustion and will extinguish itself when the source of flame is removed. In the event of a fire, wool is a much safer material than man-made products as it does not release poisonous fumes. |
| Environmental Benefits | Sheepwool Insulation products have unrivalled environmental credentials, making it them the “greenest” choice of any insulation product on the market. Sheep’s wool is a naturally occurring fibre, so it is a renewable and sustainable source of raw material. Wool has zero global warming potential and is carbon neutral, so choosing Klemmfilz means your insulation will have no environmental impact. Sheepwool Insulation also requires only a fraction of the energy to produce in comparison to other insulation materials. At the end of its useful life, Klemmfilz can be reused as insulation, recycled into other wool products or buried where it will eventually biodegrade. |
| Value | Klemmfilz is initially a higher cost product than most common insulation types. However, Klemmfilz performance advantage and lifespan, means that over it’s lifetime, it will perform considerably better than it’s competitors. At Klemmfilz density, Sheepwool Insulation continues to supply the lowest priced pure wool insulation range in the world, Klemmfilz offers a natural insulation product range that can be used right throughout a building, making it an effective solution for a range of applications. For convenience, Klemmfilz is produced in 100mm & 150mm . Due to it’s higher performance, Klemmfilz will often require less material thickness than it’s competitors to achieve a similar thermal performance and can be used in situations where man-made fibre products would not meet building regulations. |
| Applications | 1: Attic/Loft (Ceiling Level) 2: Attic/Loft (Between Rafter) 3: Floors (Between Joists) 4: Internal Walls (Between Studs) 6: External Walls (Between Studs) |
| Width | 380, 570 |
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| Thickness | 80, 50, 30 |
FAQs
What is ISOLENA Klemmfilz insulation made from?
ISOLENA Klemmfilz is made from 100% pure sheep’s wool, with no synthetic additives or supporting fibres. It uses Ionic Protect®, a biocide-free treatment that ensures long-term durability while maintaining a healthy indoor environment.
What is the thermal conductivity of Klemmfilz insulation?
Klemmfilz has a thermal conductivity of 0.033 W/mK, providing excellent thermal performance for between timber application including walls, rafters, ceilings, and partitions.
Where can sheep wool insulation be used?
Klemmfilz is suitable for a wide range of applications, including:
• Between rafters, studs & joists
• Internal wall insulation – between studs
• Partition walls
• Ceilings and suspended ceilings
It is ideal for both modern construction and heritage buildings.
Is sheep wool insulation breathable?
Yes. Klemmfilz has a vapour diffusion resistance factor of µ = 1, meaning it is highly breathable and allows moisture to pass through naturally. This makes it perfect for vapour-open constructions.
Does Klemmfilz provide acoustic insulation?
Yes. It offers excellent sound performance with a weighted sound absorption coefficient of 0.85, helping to reduce airborne noise and improve acoustic comfort.
Is ISOLENA Klemmfilz environmentally friendly?
Absolutely. It is:
• Renewable
• Reusable
• Fully recyclable
• Certified with the NaturePlus eco-label
It is a strong choice for sustainable and low-impact construction.
Is sheep wool insulation safe to handle?
Yes. Klemmfilz contains no harmful chemicals or biocides and does not include borates classified as toxic to reproduction. It is safe and pleasant to work with compared to many synthetic alternatives.
Does sheep wool insulation resist mould and pests?
Yes. Klemmfilz achieves mould growth intensity class 0 and resistance to insect pests class 0, meaning it is highly resistant without relying on harmful treatments.
What fire rating does Klemmfilz insulation have?
Klemmfilz is classified as Euroclass D-s2, d0, meaning it has controlled fire performance suitable for many building applications .