Bio-based insulation

Bio-based insulation offers several advantages. The materials are moisture-regulating and vapour-permeable, helping to maintain a stable indoor temperature—keeping your home cooler in summer and warmer in winter.

They are also circular, store CO₂, and are free from irritating fibres. This makes bio-based insulation an environmentally friendly alternative to materials like PIR or PUR, without compromising on performance.

At De Vries Insulation, we work with a range of bio-based insulation materials, including flax (Isovlas), grass fibres (Gramitherm), and recycled textiles (Métisse). Each material has its own strengths in terms of thermal performance, sound insulation, and moisture regulation.

During a consultation, we determine which bio-based insulation material best suits your home and roof structure.

Bio-based insulation materials offer performance that is comparable to—and sometimes even better than—traditional insulation. Thanks to their high thermal mass, they help keep spaces cooler in summer and warmer in winter for longer periods.

This results in excellent thermal performance, especially in roof insulation where temperature fluctuations can be significant.

Bio-based insulation materials are made from natural fibres that absorb CO₂ during their growth. They are renewable, circular, and have a low environmental footprint.

In addition, they do not contain harmful substances or chemical binders, making both production and installation far less harmful to people and the environment compared to traditional insulation materials.

Yes, bio-based insulation materials are eligible under the ISDE subsidy scheme. The government encourages the use of sustainable insulation by offering an additional subsidy bonus for bio-based materials. This means you often receive a higher subsidy for bio-based roof insulation compared to materials like mineral wool or rigid foam.

During a consultation, we can calculate exactly how much subsidy you may be eligible for.

Modern bio-based insulation materials meet strict European fire safety standards. They are treated with natural fire retardants and often fall within fire classes C or B.

Many materials, such as flax wool, char when exposed to fire, forming an additional insulating layer that helps slow down the spread of flames.

When properly installed and used, bio-based insulation can last for decades. The materials retain their shape, insulation performance, and moisture-regulating properties throughout the lifespan of the building.

Because they are vapour-permeable, there is less risk of condensation and mould growth, which further supports the durability of the roof structure.