European Technical Assessment
European Technical Assessment
The European Technical Assessment (ETA) 11/0137, issued by the Austrian Institute of Construction Engineering (OIB), pertains to LIGNATUR-box, surface, and shell elements, which are prefabricated wood-based loadbearing stressed skin panels manufactured by Lignatur AG in Switzerland. This document replaces the previous approval valid from 2012 to 2017 and is based on the ETAG 019 guideline.
The LIGNATUR elements are large-size floor and roof components made from softwood, featuring parallel skins and ribs. They can be open or closed box types, with or without thermal insulation, which does not contribute to structural characteristics. The skins and ribs are bonded with adhesive, and the elements can include ballast weight for non-structural purposes.
These elements are designed for load-bearing or non-load-bearing applications in floors and roofs, suitable for static and quasi-static actions. They are intended for use in service classes 1 and 2 as per EN 1995-1-1, requiring protection from weather exposure.
The product's performance is assessed based on mechanical resistance, fire safety, hygiene, and environmental impact. Essential characteristics include load-bearing capacity, fire resistance, moisture resistance, sound insulation, and thermal properties. The elements are expected to have a working life of 50 years under proper installation and maintenance.
Installation must be conducted by qualified personnel following the manufacturer's instructions, with an assembly plan available on-site. The elements should be protected during transport and storage, and damaged products must not be used. Maintenance is generally not required, but any necessary repairs should be assessed individually.
Timber used in the elements must be strength graded and technically dried, conforming to EN 338. Adhesives must meet EN 15425 or EN 301 standards. Thermal insulation and ballast weight components must comply with relevant European standards and be CE marked.
- General: The assessment covers mechanical resistance, stability, fire safety, hygiene, health, environmental protection, noise protection, and energy economy as per Regulation (EU) № 305/2011.
- Identification: The product is identified based on data deposited with the Österreichisches Institut für Bautechnik. Any changes to the product or production process must be reported to the institute.
- System 1: The manufacturer must conduct factory production control and further testing of samples. A notified product certification body assesses the product's performance, inspects the manufacturing plant, and conducts continuous surveillance.
- Factory Production Control: The manufacturer maintains a documented system ensuring conformity with the ETA. This includes specifications of materials, structural member positions, dimensions, and installation of insulation products.
- Declaration of Performance: The manufacturer issues this declaration once all criteria are met.
- LIGNATUR Box Element (LKE): Height ≤ 400 mm, Width ≤ 250 mm, Length ≤ 18 m.
- LIGNATUR Surface Element (LFE): Height ≤ 320 mm or 320-480 mm, Width ≤ 1,000 mm, Length ≤ 18 m.
- LIGNATUR Shell Element (LSE): Height ≤ 250 mm, Width ≤ 1,000 mm, Length ≤ 18 m.
- Load bearing capacity and serviceability are determined according to EN 1995-1-1 (Eurocode 5).
- Moisture content is verified according to EN 13183-1.
1. Reaction to Fire
LIGNATUR-elements without perforation for floors and roofs are classified as D-s1, d0 according to EN 13501-1. The overall thickness of load-bearing elements must be at least 120 mm, with skins and ribs in planed spruce at least 25 mm thick. Perforated elements also meet the same fire classification.
2. Resistance to Fire
The charring rate for standard elements is 0.8 mm/min as per EN 1995-1-2. For perforated elements, specific charring rates are detailed in Annex 3.
3. Water Vapour Permeability and Moisture Resistance
Softwood has a water vapour resistance factor (μ) between 20 and 50 according to EN ISO 10456. No performance is determined for water tightness as the product does not include external finishes.
4. Release of Dangerous Substances
Formaldehyde emissions are classified as E1 according to EN 717-1. No other dangerous substances are identified as per ETAG 019.
5. Sound Insulation
Airborne and impact sound insulation performance is detailed in Annex 4, with specific examples of LIGNATUR-elements provided.
6. Thermal Resistance
Thermal conductivity for spruce wood is 0.13 W/(m·K) as per EN ISO 10456. The characteristic density is 350 kg/m³, and heat capacity is 1600 J/(kg·K).
7. Fire Resistance - Joints
Joints between LIGNATUR-elements for fire resistance classes REI30, REI60, and REI90 are specified with appropriate joint widths and insulation requirements.
8. Sound Absorption
Perforated skins for acoustic elements are detailed in Annex 5, with various types and their sound absorption coefficients (αw) provided.
- Acoustics Type 9.1, Class of Absorber: D
- Slot Dimension: 5.5 / 380 mm
- Grid: 24 / 600 mm
- Sound Absorption Coefficient (αw): 0.50
- ETAG 019: Prefabricated wood-based loadbearing stressed skin panels
- EN 301: Adhesives for load-bearing timber structures
- EN 338: Structural timber strength classes
- EN 717-1: Formaldehyde emission determination
- EN 1995-1-1 & EN 1995-1-2: Eurocode 5 for timber structures
- EN 13183-1: Moisture content determination
- EN 13501-1+A1: Fire classification of construction products
- EN 15425: Polyurethane adhesives for timber structures
- EN ISO 10140-2 & 10140-3: Sound insulation measurement
- EN ISO 354: Sound absorption measurement
- EN ISO 717-1 & 717-2: Sound insulation rating
- EN ISO 6946: Thermal resistance and transmittance
- EN ISO 10211: Thermal bridges in building construction
- EN ISO 10456: Hygrothermal properties of building materials
- EN ISO 11654: Sound absorbers rating
- The document replaces the previous approval with validity from 19.11.2012 to 18.11.2017.
Catalog excerpts
digital copy digital copy European Technical Assessment GENERAL PART digital copy digital copy digital copy Trade name of the construction product LIGNATUR-box element (LKE), -surface element (LFE) and -shell element (LSE) Product family to which the construction product belongs Prefabricated wood-based loadbearing stressed skin panels Lignatur AG Herisauerstraße 30 9104 Waldstatt Switzerland Manufacturing plant Lignatur AG Herisauerstraße 30 9104 Waldstatt Switzerland This European Technical Assessment contains 27 Pages including 6 Annexes which form an integral part of this assessment This European Technical Assessment is issued in accordance with Regulation (EU) № 305/2011, on the basis of Guideline for European Technical Approval ETAG 019 “Prefabricated wood-based loadbearing stressed skin panels”, Edition November 2004, used as European Assessment Document This European Technical Assessment replaces digital copy Österreichisches Institut für Bautechnik (OIB) Austrian Institute of Construction Engineering digital copy Technical Assessment Body issuing the ETA European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017
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digital copy digital copy Page 2 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 Remarks Translations of this European Technical Assessment in other languages shall fully correspond to the original issued document and should be identified as such. Communication of this European Technical Assessment, including transmission by electronic means, shall be in full. However, partial reproduction may be made with the written consent of Austrian Institute of Construction Engineering. Any partial reproduction...
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digital copy Page 3 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 The thermal insulation products are not subject to the European Technical Assessment. digital copy Ballast weight such as concrete blocks, aggregates etc. does not contribute to the load bearing characteristics of the LIGNATUR-elements. Concrete blocks and aggregates conform to a harmonised European standard or a European Technical Assessment. For ballast weight with aggregates from calcium carbonate, see Clause 3.1.2.4. The...
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Installation The manufacturer shall prepare installation instructions in which the product-specific characteristics and the most important measures to be taken into consideration for installation are described. The installation instructions shall be available at every construction site and shall be deposited at Österreichisches Institut für Bautechnik. digital copy digital copy Page 4 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 Installation of LIGNATUR–elements shall be carried out by appropriately...
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digital copy Page 5 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 Performance of the product and reference to the methods used for its assessment Table 1: Essential characteristics of the product and methods of verification and assessment digital copy Method of verification and assessment Essential characteristic Expression of product performance Basic Requirement 1: Mechanical resistance and stability1 1 Load bearing capacity Moisture content digital copy Basic Requirement 2: Safety in case...
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digital copy Page 6 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 The material characteristics, dimensions, and tolerances of the product and its components not indicated in Annex 1 are given in the technical file3 of the European Technical Assessment. digital copy digital copy 3.1.1.2 Safety in case of fire The classifications of the LIGNATUR-elements regarding reaction to fire and resistance to fire are given in Annex 2, Table 1. 3.1.1.3 Hygiene, health and environment On dangerous substances...
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digital copy Page 7 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 Methods of verification General The assessment of fitness of the LIGNATUR-elements for the intended use in relation to the requirements for mechanical resistance and stability, for safety in case of fire, for hygiene, health and the environment, for safety and accessibility in use, for protection against noise and for energy economy and heat retention in the sense of the Basic Requirements 1 to 6 of Regulation (EU) № 305/2011...
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(ii) further testing of samples taken at the manufacturing plant by the manufacturer in accordance with a prescribed test plan4; (b) the notified product certification body shall decide on the issuing, restriction, suspension or withdrawal of the certificate of constancy of performance of the construction product on the basis of the outcome of the following assessments and verifications carried out by that body: digital copy digital copy Page 8 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017...
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digital copy Page 9 of European Technical Assessmen ETA-11/0137 of 20.06.2014, replaces European technical approval ETA-11/0137 with validity from 19.11.2012 to 18.11.2017 digital copy Results of controls and tests and, if appropriate, comparison with requirements Name and signature of person responsible for factory production control The records shall be kept at least for ten years time after the construction product has been placed on the market and shall be presented to the notified product certification body involved in continuous surveillance. On request they shall be presented to Österreichisches...
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