Member of 

SINTEF Building and

Infrastructure             www.eota.eu
P.O.Box 124 Blindern
NO-0314 Oslo
Tel. +47 73 59 30 00
Fax +47 22 69 94 38
www.sintef.no/byggforsk

 
 

European Technical ETA 08/0178

Assessment of 07/09/2015
 

General Part

SINTEF Building and Infrastructure is a Technical Assessment Body designed by

(MS) according to Article 29 of the Regulation (EU) No 305/2011.
Trade name of the construction product Kodumaja building modules

Product family to which the construction Timber frame building kits based on
product belongs prefabricated house modules

Manufacturer Kodumaja AS
Ravila 61
Tartu 51014
Estonia
http://www.kodumaja.ee
Manufacturing plant(s) - Kodumajatehase AS, Betooni 2, Tartu
51014, Estonia
- OÜ KM Element, Ravila 61, Tartu 51014,
Estonia
This European Technical Assessment 13 pages including Annex A1-A4 and
contains separate document Annex B, which form an
integral part of this assessment.
Annex B refers to confidential information
which is not included in the European
Technical Assessment when that
assessment is publicly disseminated

This European Technical Assessment is ETAG 007(11-2012) Timber frame building

issued in accordance with regulation kits, used as European Assessment
(EU) No 305/2011, on the basis of Document (EAD).
This ETA amends a corrigendum to ETA 08/0178, version 1, issued on
29/09/2008

   

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 2 of 13

1.  Technical description of the product 

Kodumaja building modules are kits made of prefabricated building modules with timber frame 
structures in floors, walls and roof. The modules are delivered from the factory with installed 
windows and doors, external cladding, internal linings and technical service installations. Module size 
is custom made for each delivery, but maximum dimensions are 5.3 m width, 3.8 m height and 14.5 
m length. 

This assessment covers the standard design of the module structures, including wet rooms, and the 
connections between several modules installed together as a building. The basic module design is 
shown in Annex A1, and the material and component specifications in Annex A2. The detailed 
construction design is shown in Annex B. 

The assessment does not cover external or internal surface, finishes, windows, doors and 
supplementary components like stairs, balconies etc., or technical service installations. These 
products are specified case by case, and their performance has to be verified specifically as parts of 
the works in each case. 

The modules shall be placed on a foundation that meets the manufacturer’s specified requirements 
concerning dimensions, tolerances (± 3 mm) and loadbearing capacity. A damp‐proof course or 
equivalent must prevent moisture uptake in the modules from foundations. 

The modules shall be installed according to the relevant construction details in Annex B, plus a 
special installation manual worked out by the manufacturer for each individual works. The 
installation manual shall cover all installation aspects for the modules, including: erection systems 
and equipment, temporary bracing, permanent anchoring to foundations and between modules, 
weather protection during installation, materials and components which are necessary supplements 
to the modules as well as standard assembly joints and special joint designs for individual modules. 

The modules shall be fully protected from weather exposure and mechanical damage during storage, 
transportation and installation. 

2.  Specification of the intended use(s) in accordance with the applicable European 
Assessment Document (hereinafter EAD) 

The building modules are intended for low rise or multi‐storey houses, with vertical and horizontal 
separations between housing units. The modules may also be used for non‐residential buildings 
where the performance requirements are more or less the same as for residential houses. 

The modules should only be used in areas where cooling systems may be installed and operated for 
long periods of time when the risk of interstitial moisture condensation has been assessed for each 
individual site and use conditions. 

No special verification of structural resistance related to seismic actions has been determined. 

The kits are intended to be placed on all types of ordinary foundations like concrete slabs on ground, 
masonry or concrete basement walls, or strip foundations. 

For the serviceability of the kit, it shall be ensured that suspended floors have sufficient stiffness to 
avoid unacceptable vibrations from normal use. The verification of this characteristic shall be part of 
the calculation according to clause 3.2.1 in this ETA. 

The wood components are not treated for use in areas with termite attacks. 

The provisions made in this European technical assessment are based on an assumed working life of 
50 years. The indications given on the working life cannot be interpreted as a guarantee given by the 
 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 3 of 13

producer, but are to be regarded only as a means for choosing the right products in relation to the 
expected economically reasonable working life of the works. 

3.  Performance of the product and references to the methods used for its assessment 

3.1  General 
The following table shows the characteristics for which the product performances are declared in 
Annex A2‐A4. The characteristics correspond to the Kodumaja building modules design specified in 
Annex A1 and B. 

Basic works requirement Product characteristic Product performance

Resistance of walls, floor and

See cl. 3.2 and
Mechanical resistance and roof structures and their
Annex A1 and A2 of this
stability connections against horizontal
ETA
BWR 1 and vertical loads
Resistance against seismic
See cl. 3.2.1 No performance determined (NPD)
reaction

See cl. 3.3.1 and

Reaction to fire
Annex A2 Table A2-1
BWR 2 Safety in case of fire
See cl. 3.3.2 and
Fire resistance
Annex A3 Table A3-1- A3-2

Vapour permeability and

See cl. 3.4.1
moisture resistance

Hygiene, health and the

BWR 3 Water-tightness See cl. 3.4.2
environment

Content and release of

See cl. 3.4.3
dangerous substances

No performance determined
Slipperiness of the floor
(NPD)
BWR 4 Safety and accessibility in use

Impact resistance See cl. 3.5.2

See cl. 3.6.1

Airborne sound insulation
BWR 5 Protection against noise
Impact sound insulation See cl. 3.6.2

See cl. 3.7.1 and

Thermal resistance
Annex A4 Table A4-1.

Energy economy and heat See cl. 3.7.2

BWR 6 Air permeability
retention

No performance determined
Thermal inertia
(NPD)

Sustainable use of natural

BWR 7 No performance determined (NPD)
resources

Durability aspects See cl. 3.8

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 4 of 13

3.2   Mechanical resistance and stability (BWR 1) 

3.2.1  General 
The mechanical resistance and stability of all load‐bearing parts of each individual kit are calculated 
and structurally designed for each delivery, on the basis of the standard component design and 
material specifications shown in Annexes A1, A2 and B. The calculations shall be made according to 
relevant parts of EN 1991‐1 and EN 1995‐1‐1, including the national annexes to standards and any 
supplementary requirements which are relevant for the country of delivery. 

If the kit is intended to be used in areas with seismic actions, its behaviour in this respect should be 
considered and clarified case‐by‐case, taking into account national rules on works, if needed. 

3.3  Safety in case of fire (BWR 2) 

3.3.1  Reaction to fire 
Reaction to fire classification according to EN 13501‐1+A1 is shown for each individual material and 
component in Annex A2. 

A European reference fire scenario has not been laid down for facades. In some Member States, the 
classification according to EN 13501‐1 might not be sufficient for the use in facades. An additional 
assessment of Kodumaja building modules according to national provisions (e.g. on the basis of a 
large scale test) might be necessary to comply with Member State regulations, until a European 
classification system has been completed. 

3.3.2  Resistance to fire 
For basic module designs, as shown in the Annex A1, the resistance to fire classified according to EN 
13501‐2+A1 is tabulated in Annex 3, table A3‐1.  

For alternative module design, as shown in Annex B only, the resistance to fire classified according to 
EN 13501‐2+A1 is tabulated in Annex 3, table A3‐2.  

3.4  Hygiene, health and environment (BWR 3) 

3.4.1  Vapour permeability and moisture resistance 
Vapour permeability and moisture resistance of the module construction have been assessed on the 
basis of calculations according to EN ISO 13788 to be acceptable for the intended use indicated in 
clause 2. 

The water vapour resistance sd (equivalent air resistance) for the layers on both sides of the thermal 
insulation is: 

‐ Water vapour control layer:  sd  ≥ 80 m  

‐ Breather paper/wind barrier:  sd ≤ 0, 05 m 

3.4.2  Watertightness 
The design of the external walls has been assessed on the basis of engineering judgement and 
experience to give adequate tightness against driving rain exposure in general. 

The membrane system used to provide watertightness of zones with direct water exposure in 
internal wet room floors and walls has been tested and assessed according to the provisions in ETAG 
022. 

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 5 of 13

3.4.3  Release of dangerous substances 
The modules comply with the provisions of EC Guidance Paper H and EU database on dangerous 
substances. The manufacturer has declared that the materials and components in the modules do 
not have any known emissions of particles or radiation that may have a negative influence on the 
internal or external environment. 

The wood‐based products in the modules meet the requirements for formaldehyde class E1 in EN 
13986. 

In addition to the specific clauses relating to dangerous substances contained in this European 
Technical Assessment, there may be other requirements applicable to the products 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 Regulation, these 
requirements need also to be complied with, when and where they apply. 

3.5  Safety in use (BWR 4) 

3.5.1  Slipperiness of floors 
No performance determined (flooring is not part of the approved kit). 

3.5.2  Impact resistance 
Impact resistance of wall structures has been assessed on the basis of experience to be adequate for 
the intended use of the kit. 

3.6  Protection against noise (BWR 5) 

3.6.1  Airborne sound insulation 
Estimated weighted apparent airborne sound reduction index for standard separating wall and floor 
constructions between housing units as defined in ISO 140/ISO 717 is R'w  55 dB. 

No performance has been determined for the external walls and roof constructions. 

3.6.2  Impact sound insulation 
Estimated weighted normalized impact sound pressure level of the standard separating floor 
construction between housing units as defined in ISO 140/ISO 717 is L'n,w  53 dB. 

3.7  Energy economy and heat retention (BWR 6) 

3.7.1  Thermal resistance 
The design thermal resistance and thermal transmittance of the building modules, calculated 
according to EN ISO 6946 is as tabulated in Annex A4 table A4‐1. 

3.7.2  Air permeability  
The standard construction details of the module design shown in Annex B have been assessed to 
have adequate air tightness for the specified intended use. A building based on a properly installed 
kit should provide an overall air leakage ≤ 1.5 air changes per hour, tested at 50 Pa static pressure 
difference according to ISO 9972. 

3.8  Aspects of durability 

The timber species used in the modules are softwood in class 4 concerning natural durability and 
resistance to fungus attack according to EN 350‐2. Structural components and internal linings are in 
hazard class 1 according to EN 335‐1, and timber cladding is in hazard class 2. 

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 6 of 13

The assumed minimum working life of 50 years for the kits indicated in clause 2 requires regular 
maintenance. The manufacturer shall ensure that each delivery contains proper information about 
necessary maintenance requirements and guidance for the modules. 

4.  Assessment and verification of constancy of performance (hereinafter AVCP) system 
applied, with reference to its legal base 

According to the Decision 99/455/EC1 of the European Commission as amended, the system of 
assessment and verification of constancy of performance (see Annex V to Regulation (EU) No 
305/2011) is system 1.  

5.  Technical details necessary for the implementation of the AVCP system, as provided for in 
the applicable EAD 

Technical details necessary for the implementation of the AVCP system are laid down in the control 
plan deposited at SINTEF Building and Infrastructure2. 

Issued in Oslo, Norway on 07/09/2015 

By 

SINTEF Building and Infrastructure 

Jan Olav Hjermann 

 
Research Director 

Annexes:
Annex A1 – Basic module design
Annex A2 – Material and component specifications
Annex A3 – Resistance to fire
Annex A4 – Design thermal resistance
Annex B – Standard construction details (separate document, not included)

                                                            
1
 Official Journal of the European Communities N° L 178, 14.7.1999, p.56 
2
 The "control plan" is a confidential part of the European Technical approval and only handed over the 
approved body or bodies involved in the procedure of attestation of conformity. 
 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 7 of 13

Kodumaja building modules Annex A1

Basic module design

Walls
The principle wall designs are shown in fig. A1 – A3.

Standard wall Optional external wall design

Fig. A1
Principle design of standard external walls.

Fig. A2 Fig. A3
Principle design of standard internal walls. Principle design of standard separating wall between
Stud dimension is 45 mm x 95 mm in modules and between housing units.
loadbearing walls.
Shaft walls EI 30 have single layers of gypsum board
on each side as shown, shaft walls EI 60 have double
layers on each side or an additional 15 mm gypsum
board type F on the shaft side.

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 8 of 13
 

Floors
The principle floor designs are shown in fig. A4 – A7.

Fig. A4
Principle design of suspended ground floor. Floor
joists may be of solid wood sections or wood I-
beams.

Fig. A6
Principle design of separating floor construction
between modules. I-beam joists.

Fig. A5 Fig. A7
Principle design of separating floor construction Principle design of suspended ground floor
between modules. Solid wood joists. construction in bathrooms.
The lowest part is the roof/ceiling structure of the
bottom module, and the top part is the floor
structure of the top module.

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 9 of 13
 

Roof
A separate roof structure is installed on top of the modules. Fig. A8 shows the principle
design of a flat roof construction.

Fig. A8
Principle design of flat roof structure installed on top of the modules

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 10 of 13

Kodumaja building modules Annex A2 

Material and component specifications
 
Reaction to
Material / Specification fire class
(None specified dimensions shall be according to Annex 3 or specifications
component worked out separately for each delivery))
according to
EN 13501-1
Structural components
Untreated structural grade timber class C30, C24, C18 and C16 according to
Timber members in
EN14081/EN 338, and according to specific calculations. Maximum moisture D-s2, d0
walls, floors and roof
content 18%
I-beams Masonit I-beams according to ETA-12/0018 D-s2, d0
18 mm particleboard type P5 according to EN 13986 or equivalent, formaldehyde
Roof sheathing D-s2, d0
class E1
Subfloor 22 mm particleboard type P6 according to EN 13986, formaldehyde class E1 D-s2, d0
Insulation materials
Saint-Gobain Isover mineral wool insulation, CE-marked according to EN 13162
and certificate no. C248/03 issued by VTT(Technical Research Centre of Finland),
with the following declared thermal conductivities:
Type KL-A35: λD = 0,035 W/mK for insulation between studs and beams (density
3
Thermal insulation ≥ 16 kg/m ). A1
Type RKL: λD = 0,031 W/mK for additional insulation of external walls (density ≥
3
60 kg/m )
Type VKL: λD = 0,032 W/mK for underside of suspended ground floors (density ≥
3
130 kg/m ) or similar mineral wool insulation.
Membranes and barriers
0,2 mm polyethylene Rani MOBar, according to certificate no.3189/90 issued by
Water vapour control
SP Technical Research Institute of Sweden and SINTEF Technical Approval no. F
layer
20201
Breather paper / Wind Tyvek 2460B in conformity with CE marking according to EN 13859-2 and
E
barrier SINTEF Technical Approval no. 2043
Claddings and linings
External cladding Min. 19 mm timber boards with quality equivalent to NS 3186 D-s2, d0
External wall sheathing 9 mm OSB boards type OSB/3 according to EN 13986, formaldehyde class E1 D-s2, d0
- 10 mm particleboard type P1 according to EN 13986, formaldehyde class E1 D-s2, d0
- OSB/3 ECO strand board panels according to EN 13986 and EN 300 and D-s2, d0/ DFL-s1
Internal linings SINTEF Technical Approval no. 20155
- 12,5 mm gypsum board type A according to EN 520 A2-s1, d0
- 12,5 mm and 15 mm gypsum board type DF according to EN 520 A2-s1, d0
Fasteners
Mechanical fasteners Mechanical fasteners and connectors for external use shall be protected by hot
A1
and connectors dip galvanization or have equivalent protection against corrosion
Glue for floor sheathing CascoILin Object 3459, Casco Proff Solid 3480 NPD
Sealant for façade for
interior/exterior Silicon - Soudal Silirub AL E
application
Wet rooms
Mira 6998 betomix Quick
Weber Vetonit 5400
Concrete floor slab A1
Kiilto 70
Topcem pronto Heikki Haru Oy/Mapei
Membrane for wet zones Mira 4400 Multicoat og 4410 Vapourstop according to ETA-09/0156 F
Floor screed Mira X-plan floor screed according to EN 13813 A1
Internal lining 12,5 mm gypsum board type A or DF according to EN 520 A2-s1, d0
®
Water pipes Roth Multipex Rørsystem according to SINTEF Technical Approval no. 2556
NPD
Drain pipes Uponor HTP PP drain pipes according to InstaCert 4010, 4032, 4048, 4064
NPD
Vieser PP gullies according to EN 1253 and SINTEF certificate no. 0444
Gullies
Vieser PP spacer for gullies according to EN 1253 and SINTEF certificate no. NPD
0466

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 11 of 13

Reaction to
Material / Specification fire class
(None specified dimensions shall be according to Annex 3 or specifications
component worked out separately for each delivery))
according to
EN 13501-1
-Essve Squeezer A-PF55 plastic pipe penetration according to certificate no. 339-
01/08 issued by EstCert OÜ
-Essve fire sealing system Kniparen according to SINTEF product documentation
no. SINTEF AA – 102
Seals for fire
-ESSVE Fogskum 90 according to SINTEF product documentation no. SINTEF F
penetration
AA – 22
-Soudal Firecryl FR plasto-elastic joint sealant according to EN 1366 or similar
Fire Rating: Draft European Commission Decision RG N170 REV 1

   

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 12 of 13

Kodumaja building modules Annex A3

Resistance to fire
Table A3-1
For basic module designs as shown in the Annex A1, the resistance to fire classified according to EN 13501-2 is
as follows for fire exposure from the inside. The loadbearing capacities of structures for action fire are calculated
according to EN 1955-1-2 for each individual kit and delivery.

Structure Fire resistance

External walls REI 30

- with 1 layer of 12.5 mm gypsum board type A lining
External walls
- with 1 layer of 15 mm gypsum board type F plus 1 layer of 12 mm REI 60
particleboard or 12.5 mm gypsum board type A lining

Internal separating walls – load -bearing REI 30

- with 2 layers of 12.5 mm gypsum board type A lining
Internal separating walls – load-bearing
REI 60
- with 1 layer of 12.5 mm type F and 1 layer of 12.5 mm type A
gypsum board lining
Shaft walls not load-bearing EI 30
- with 1 layer of 12.5 mm gypsum board type A lining on each side

Shaft walls not load-bearing

EI 60
- two layers of 12.5 mm gypsum board type A lining on each side,
alternatively one additional layer of 15 mm type F on the shaft side

Separating floors REI 30

- with 2 layers of 13 mm gypsum board type A as ceiling
Separating floors
REI 60
- with 1 layer of 15 mm type F and 1 layer of 12.5 mm type A gypsum
board as ceiling

Table A3-2
For alternative module designs as shown in Annex B, the resistance to fire classified according to EN 13501-2 is
as follows for fire exposure from the inside. The loadbearing capacities of structures for action fire are calculated
according to EN 1955-1-2 for each individual kit and delivery.

Structure Fire resistance

Internal separating walls – load-bearing REI 90

- confidential information
Separating floors REI 120
- confidential information

 
European Technical Assessment No. ETA-08/0178 issued on 07/09/2015 Page 13 of 13

Kodumaja building modules Annex A4

Thermal resistance

Table A4-1
Design thermal resistance of Kodumaja building modules calculated according to EN ISO 6946
Thermal insulation Total thermal Thermal
Structure thickness resistance transmittance (U)
mm (m2K)/W W/(m2K)
External walls
- Standard 245 6.4 0.156
- Alternative 200 5.3 0.188
Suspended ground floors
- With I-beam joists 313 8.3 0.121
Roofs
- With I-beam joists
300 7.8 0.127