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European  Technical  Approval  ETA-12/0487  


  Trade name 

Thermocell Wood Fibre Insulation 

Thermocell Wood Fibre Insulation – Boric acid 




  Holder of approval 

Thermocell Sverige AB 
Metallverksgatan 9 
721 30  VÄSTERÅS 



Produktbeskrivning och avsedd 

Lösfyllnadsisolering av cellulosafiber, träfiber 

  Generic type and use 
  of construction product 

Wood fibre loose fill to be installed in building constructions for the 
purpose of thermal insulation. 







t o m 




  Manufacturing plant 

Thermocell Sverige AB 
Metallverksgatan 9 
721 30  VÄSTERÅS 



Godkännandet innehåller 
This Approval contains 

10 Sidor  
10 Pages  

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Page 2 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012






This European Technical Approval is issued by SITAC in accordance with: 
−  Council Directive 89/106/EEC of 21 December 1988 on the approximation of laws, 

regulations and administrative provisions of Member States relating to construction 
products1, modified by Council Directive 93/68/EEC2 and Regulation (EC) N° 
1882/2003 of the European Parliament and of the Council3; 

−  Common Procedural Rules for Requesting, Preparing and the Granting of European 

Technical Approvals set out in the Annex to Commission Decision 94/23/EC4; 


SITAC is authorized to check whether the provisions of this European Technical Approval 
are met. Checking may take place in the manufacturing plant(s). Nevertheless, the 
responsibility for the conformity of the products to the European Technical Approval and for 
their fitness for the intended use remains with the holder of the European Technical 


This European Technical Approval is not to be transferred to manufacturers or agents of 
manufacturers other than those indicated on page 1, or manufacturing plants other than those 
indicated on page 1 of this European technical approval 


This European Technical Approval may be withdrawn by SITAC in particular pursuant to 
information by the Commission according to Article 5(1) of Council Directive 89/106/EEC. 


Reproduction of this European Technical Approval including transmission by electronic 
means shall be in full. However, partial reproduction can be made with the written consent 
of SITAC In this case partial reproduction has to be designated as such. Texts and drawings 
of advertising brochures shall not contradict or misuse the European Technical Approval. 


The European Technical Approval is issued by the approval body in English. Translations 
into other languages have to be designated as such. 



Official Journal of the European Communities L 40, 11.2.1989, p. 12 


Official Journal of the European Communities L 220, 30.8.1993, p. 1 


Official Journal of the European Union L 284, 31.10.2003, p. 25 


Official Journal of the European Communities L 17, 20.1.1994, p. 34 

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Page 3 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012






Definition of product and intended use 


Definition of product 
This European Technical Approval applies to the thermal insulation material in the form of 
wood fibre loose fill with the trade names: 

 Table 0 

Trade name 

 Sub trade name 

Thermocell Wood Fibre Insulation 

FeelingWood Fibre 
H 2 Wood,  
Thermocell Träfiberisolering 

Thermocell Træfiberisolering 

Thermocell Wood Fibre Insulation 

– Boric acid 

FeelingWood Fibre - Boric acid 
H 2 Wood - Borsäure 
Thermocell Träfiberisolering - Borsyra 
Thermocell Træfiberisolering - Borsyre 

The insulation material is derived from wood by mechanical crushing. During the manufacturing 
process the product is provided with fire retardants and in some versions also boric acid. 


Intended use 
The insulation material is used for the production of thermal insulation layers, not exposed to 
compression loads, by means of machine processing at the place of use. The machine 
processing is carried out in dry conditions. 

The insulation material can be used for the following types of intended uses: 

Area of application for walls:  

Type 1: Space filling insulation in closed cavities of external and internal walls. 

Area of application for roofs and ceilings/floors:  

Type 2: Insulation in closed cavities in arched or pitched roofs. 

Type 3: Cavity insulation in horizontal roofs and floor constructions. 

Type 4: Exposed insulation in horizontal or moderately pitched areas (≤ 15

°), e.g. 

insulation of ceilings which are accessible but not subjected to foot traffic. 

The insulation material shall only be installed in structures where it is protected from wetting, 
weathering and direct contact to soil. 

The provisions made in this European Technical Approval are based on an assumed working 
life of the insulating material of 50 years, provided that the conditions laid down in clauses 
4.2, 5.1 and 5.2 for the packaging, transport, storage, installation and use are met. The 
indications given on the working life cannot be interpreted as a guarantee given by the 
manufacturer or the approval body, but should only be regarded as a means for choosing the 
appropriate products in relation to the expected economically reasonable working life of the 

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Page 4 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012




Characteristics of product and methods of verification  


Composition and production method 
In regard to the composition and production method the insulation material shall correspond to 
that which was the subject to the approval tests. Composition and production method are 
deposited with SITAC. 




The density is determined according to ISO/CD 18393. Depending on the area of application 
the densities stated in Table 1 shall be observed and controlled by the installer. 

Table 1 

Thermocell Wood Fibre Insulation  

Thermocell Wood Fibre Insulation – Boric acid 



Type 1, cavity insulation in internal and external 


Type 2, insulation in closed cavities in arched and 
pitched roofs ≤90°, where no settlement is accepted 


Type 3, cavity insulation in horizontal roofs and 
floor constructions, where no settlement is accepted 


Type 4, Exposed insulation in horizontal or 
moderately arched or pitched areas (≤ 15

















The settlement is determined according to ISO/CD 18393 and test methods stated in Table 2. 
The maximum values of settlement stated in Table 2 are not exceeded. 










Table 2 

Thermocell Wood Fibre Insulation  

Thermocell Wood Fibre Insulation – Boric acid  

Maximum settlement

Method A – Settling by impact excitation 
Exposed insulation in horizontal 


Method C – Settling of wall cavity insulation by 


Method D – Settling by specified climatization 
Exposed insulation in horizontal 


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Page 5 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012






Thermal conductivity 


The thermal conductivity is determined at the reference temperature of 10


C according to EN 



Thermocell Wood Fibre Insulation 

The fractile value of thermal conductivity for the density range given in clause 2.2, Type 1-4 
representing at least 90% of the production with a confidence level of 90% is 



0,0380 W/(m 

⋅ K). 


The declared value of thermal conductivity, determined according to EN ISO 10456 for a 

moisture content of the insulation material at 23°C/50% relative humidity, is             



= 0,039 W/(m ⋅ K) 


Thermocell Wood Fibre Insulation – Boric acid  

The fractile value of thermal conductivity for the density range given in clause 2.2, Type 1-4 
representing at least 90% of the production with a confidence level of 90% is 



0,0380 W/(m ⋅ K). 


The declared value of thermal conductivity, determined according to EN ISO 10456 for a 

moisture content of the insulation material at 23°C/50% relative humidity, is             



= 0,039 W/(m ⋅ K) 

- the mass-related moisture content at 23°C/50% relative humidity: u


= 0,10 kg/kg 



Reaction to fire 

Thermocell Wood Fibre Insulation and Thermocell Wood Fibre Insulation – Boric acid  
The reaction to fire of the insulating material is tested according to the standard 
EN ISO 11925-2 and classified according to the standard EN 13501-1. The insulating material 
meets the criteria of class D-s2, d0 according to EN 13501-1. 


Resistance to the growth of mould 

Thermocell Wood Fibre Insulation and Thermocell Wood Fibre Insulation – Boric acid: 
Resistance to the growth of mould was determined according to CUAP 12.01/02cl2 “In situ 
formed loose fill thermal insulating material and/or acoustic insulation material made of 
vegetable or animal fibres”, Edition June 2003. The assessment of the growth of fungi 
according to EN ISO 846 resulted in evaluation level 0. 



Airflow resistance 
Thermocell Wood Fibre Insulation and Thermocell Wood Fibre Insulation – Boric acid : 
Airflow resistance of the insulating material is determined according to the standard 
EN 29053, Method A. The mean value of the airflow resistance per unit length at a density of 
26 kg/m³ is 3,7 kPa·s/m2 or more, density of 47 kg/m³ is 15,7 kPa·s/m2 or more. 


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Page 6 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012





Corrosion-developing capacity 
No corrosion perforation according to CUAP 12.01/02cl2 “In situ formed loose fill thermal 
insulating material and/or acoustic insulation material made of vegetable or animal fibres”, 
Edition June 2003, Revision July 2009, Annex E. 


No performance determined. 




Retention of additives 
The verification of the retention of additives according to CUAP 12.01/02cl2 “In situ formed 
loose fill thermal insulating material and/or acoustic insulation material made of vegetable or 
animal fibres”, Edition June 2003, Revision July 2009, was determined. No decrease in the 
reaction to fire class nor resistance to the growth of mould have been observed. 


Water absorption 
No performance determined. 


Emission of dangerous substances 
The insulation material shall comply with the provisions of Guidance Paper H (“A harmonized 
approach related to dangerous substances under the construction product directives”, Revision 
August 2002).  

In addition to the specific clauses relating to dangerous substances contained in this ETA, 
there may be other requirements applicable to the product falling within its scope (e.g. 
transposed European legislation and national laws, regulations and administrative provisions). 
In order to meet the provisions of the Construction Products Directive 89/106/EWG, these 
requirements need also to be complied with, when and where they apply. 
With regard to health protection the product meets the product type 2 according to the EOTA 
assessment criteria ("In situ formed loose fill thermal insulation material and/or acoustic 
insulation material made of vegetable or animal fibres" Edition June 2003, Revision July 


Critical moisture level 
No performance determined.  

In addition Evaluation and attestation of conformity and CE marking 


System of attestation of conformity 
According to the decision 1999/91/EC of the European Commission amended by 2001/596/EC 
the system 3 attestation of conformity applies. 
This system of attestation of conformity is defined as follows: 

Tasks of the manufacturer: 

−  factory production control, 

b)  Tasks of the notified body: 

−  initial type-testing of the product, 

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Page 7 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012







  Tasks of the manufacturer   Factory production control 

The manufacturer shall exercise permanent internal control of production. All the elements, 
requirements and provisions adopted by the manufacturer shall be documented in a 
systematic manner in the form of written policies and procedures, including records of results 
performed. This production control system shall ensure that the product and the components 
are in conformity with this European Technical Approval. 
The manufacturer shall only use raw materials stated in the technical documentation of this 
The factory production control shall be in accordance with the control plan 
which is a part of the technical documentation of this ETA. The control plan has 
been agreed between the manufacturer and SITAC and is laid down in the context 
of the factory production control system operated by the manufacturer and SITAC 

The results of factory production control shall be recorded and evaluated in 
accordance with the provisions of the control plan.   Other tasks of manufacturer 

The manufacturer shall, on the basis of a contract, involve a body which is notified 
for the task referred to in section 3.1 in the field of thermal insulation materials in 
order to undertake the actions laid down in section 3.2.2. For this purpose, the 
control plan referred to in section and 3.2.2 shall be handed over by the 
manufacturer to the approved body involved. 
The manufacturer shall make a declaration of conformity, stating that the product is 
in conformity with the provisions of the ETA-12/0487. 


  Tasks of the approved body 

The approved body shall perform the: 

-  initial type-testing of the product 

The approved body shall retain the essential points of its actions referred to above 
and state the results obtained and conclusion drawn in written reports. 
For initial type-testing of the product the results of the tests performed as a part of 
the assessment for the ETA shall be used unless there are changes in the production 
line or plant. In such cases, the necessary initial type-testing has to be agreed 
between SITAC and the approved bodies involved. 



CE marking 

The CE marking shall be affixed on the packaging or on the accompanying 
commercial documents. The letters ‘CE’ shall be accompanied by the following 
additional information: 
-  name and address of the manufacturer, 
-  last two digits of the year in which the CE marking was affixed, 
-  number of the ETA, 
-  trade name of the product, 
-  density depending on the area of application, 
-  filling weight, 
-  declared value of thermal conductivity, 
-  reaction to fire class according to EN 13501-1. 


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Page 8 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012




Assumptions under which the fitness of the product for the intended use was 
favourably assessed 



The ETA is issued for the product on the basis of agreed data/information, deposited 
with SITAC, which identifies the product that has been assessed and judged. 
Changes to the product or production process, which could result in this deposited 
data/information being incorrect, should be notified to SITAC before the changes are 
introduced. SITAC will decide whether or not such changes affect the ETA and 
consequently the validity of the CE marking on the basis of the ETA and if so 
whether further assessment or alterations to the ETA shall be necessary. 



The thermal insulation material shall only be installed in structures where it will be 
protected from wetting and weathering and direct contact to soil. 

The installation instruction given by manufacturer shall be taken into account. 
Machine installation of the insulation material shall be performed by companies 
trained by the manufacturer. In case of exposed insulation in pitched areas slipping 
of the insulation material shall be avoided by the appropriate measures. 

The product shall be protected from moisture during installation. The insulation 
material shall not to be exposed to compression loads. The conditions according to 
clause 1.2 shall be taken into account. 

4.2.1   Parameters for the design   Design value of thermal conductivity 


The design value of thermal conductivity shall be laid down according to relevant 
national provisions.   Nominal thickness 

When calculating the thermal resistance, the nominal thickness of the insulation 
layer according to Table 4 shall be applied. 


Table 4


Area of application 


Thermocell – Boric acid 




Type 1, cavity insulation in walls 

clear span of the 

filled cavity 

Type 2-3, cavity insulation in arched 
and pitched roofs , horizontal roofs 
and floor constructions 

clear span of the 

filled cavity 

Type 4, exposed insulation in 
horizontal and moderately pitched 
areas (

≤ 15°) 

Up to 30 cm 15% and over 

30 cm 20% installation 

thickness should be added to 

the nominal thickness* 

*Recomended value by the manufacturer. 

The insulation layer shall have a constant installation thickness taking into account 
the nominal thickness. For that purpose suitable height marks shall be arranged in 
sufficient distances before the processing. The executing company shall check the 
installation thickness. 

When blowing in into closed cavities it shall be made sure by appropriate measures 
(e.g. control drillings) that the cavity is completely filled with the insulation 

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Page 9 (9) of European Technical Approval ETA-12/0487 issued on 20.12.2012



PX18389   Water vapour diffusion resistance 

For the determination of the diffusion-equivalent air layer thickness of the insulating material the 
water vapour diffusion resistance factor μ = 1 shall be used for calculating.   Installation density 

Depending on the area of application the density at built-in stage stated in Table 1, clause 2.2 shall be 
observed. The density is determined by calculation as a quotient from the mass of the material brought 
in and the full volume. The execution company shall check the density. 

4.2.2        Executing companies

The insulation material may only be machine processed by companies stated in a list of the 
manufacturer which have adequate experience in installing the material. Concerning this matter the 
manufacturer has to train these companies.  


Indications to the manufacturer 


Packaging, transport and storage 
Packaging of the product shall be performed such that the product is protected from moisture during 
transport and storage, unless other measures are foreseen by the manufacturer for this purpose. 


Use, maintenance, repair 
In the information accompanying the CE marking the manufacturer shall specify that the product shall 
be installed following the installation instruction given by the manufacturer (machine processing by 
trained companies according to 4.2.2 only) and that it shall be protected from moisture during transport, 
storage and installation. 

On behalf of SITAC 
Borås, 20-12-2012 
Lennart Månsson