Termex cellulose insulation holds an ETA/CE certificate granted by Finnish Institute of Construction Technology (formerly VTT Services, now Eurofins). Additionally, since spring 2025, we have held a UKCA certificate issued by the BBA for the UK market.
Our material is subject to daily fire protection tests and monthly heat conductivity tests, which is more frequent than many other thermal insulations available on the market. As the Termex brand we also have access to the latest research performed within the European Association of cellulose fibre manufacturers (ECIA). All this is to provide our customers with an optimum and secure application of Termex cellulose fibre according to the latest market trends.
As our product is often compared with other materials available in the market, we encourage our customers to consider the following properties while making a decision:
LAMBDA VALUE
Our declared lambda value applies to 100% of our production output, including a 50% moisture factor and the so-called standard deviation of the lambda results.
HEAT CAPACITY AND SEAMLESSNESS
Migration of heat in cellulose fibre takes place in a different manner than in fibres of mineral origin, mainly due to its low air permeability and moisture capacity. Cellulose fibre fills irregular spaces and tight corners, which is often troublesome with traditional materials. In addition to this, you avoid difficulties with suspension strings, incomplete vapour barriers, ventilation gaps, plasterboard brackets, etc. In case of a broken vapour barrier, cellulose in many cases can still perform its main function, without being degraded or damaged by mould. Due to these reasons, insulating with cellulose may lead to a better energy-saving performance.
MOULD RESISTANCE
Is there a chemical compound which reduces the growth of mould in roof structure? Yes, there is. The most popular antidote to this common problem is offered by boron compounds, widely used for timber impregnation purposes. Termex® cellulose fibre includes boric acid (sometimes also available at chemist’s as a disinfectant and antiseptic medicine). In recent years, some players of the insulation market have made attempts to discredit this substance. Cellulose insulation has utilized boron-based flame retardants safely for almost a century, offering proven fire protection without compromising health or environmental standards.
FIRE RESISTANCE
We examine the reaction to fire of our material in our plant on a daily basis. This is the key factor in ensuring the fire safety of an insulated building. We recommend checking the frequency of these tests while comparing different materials.
SETTLEMENT
In horizontal cavities, cellulose fibre is characterized by controlled settlement. The tested settlement rate of Termex® on horizontal surfaces is 4% in laboratory conditions. However, due to normative reasons, its declared value is 10%. In slanted and vertical cavities, as well as when applied with Sidox® technology, settlement is zero or marginal. This can be guaranteed only with an adequate installation technique.
ACOUSTICS
This is the next aspect which makes cellulose fibre an overall superior insulation material. Our sound absorption coefficient αw is 1.00 for a layer of 10 cm. Obtaining the same result in the case of traditional glass wool batts may require from 30 to 40 cm of insulation! The superb sound dampening properties of Termex® are due to its porous structure and the sound absorbing properties of cellulose fibre.
DURABILITY
The standard for cellulose insulation (EN 15101-1) provides a period of durability of 50 years. Our company possesses samples of material dating back to the beginning of production, which do not show any signs of degradation or deteriorated parameters. Due to the long history of our brand, we grant our customers a 10-year warranty covering the properties of the material when properly installed and protected from interference. We are convinced that our material can function for a much longer time.

