SIST EN 13168:2013
(Main)Thermal insulation products for buildings - Factory made wood wool (WW) products - Specification
Thermal insulation products for buildings - Factory made wood wool (WW) products - Specification
This European Standard specifies the requirements for factory made wood wool (WW) products, with or without facings or coatings, which are used for the thermal insulation of buildings. The products are manufactured in the form of boards or slabs. This European Standard also specifies the requirements for the factory made composite products, made from wood wool in combination with other insulation materials. This European Standard describes product characteristics and includes procedures for testing, evaluation of conformity, marking and labelling. Products covered by this European Standard are also used in prefabricated thermal insulation systems and composite panels; the performance of systems incorporating these products is not covered. This standard does not specify the required level of a given property to be achieved by a product to demonstrate fitness for purpose in a particular application. The levels and classes required for a given application are to be found in regulations or non-conflicting standards. Products with a declared thermal resistance lower than 0,15 m² .K/W or a declared thermal conductivity greater than 0,100 W/(m.K) at 10°C are not covered by this standard. This European Standard does not cover in situ insulation products and products intended to be used for the insulation of building equipment and industrial installations.
Wärmedämmstoffe für Gebäude - Werkmäßig hergestellte Produkte aus Holzwolle (WW) - Spezifikation
Diese Europäische Norm legt die Anforderungen an werkmäßig hergestellte Produkte aus Holzwolle mit oder ohne Kaschierung oder Beschichtung fest, die für die Wärmedämmung von Gebäuden benutzt werden. Die Produkte werden in Form von Platten hergestellt.
Diese Europäische Norm beschreibt auch die Anforderungen an werkmäßig hergestellte Mehrschicht Produkte, die aus Holzwolle in Verbindung mit anderen Dämmstoffen gefertigt werden.
Die vorliegende Norm schließt mehrlagige Dämmstoffe aus Holzwolle ein. Die Anweisungen in Anhang C sind zu befolgen.
Die vorliegende Norm beschreibt die Produkteigenschaften und enthält die Prüfverfahren und Festlegungen für die Konformitätsbewertung, die Kennzeichnung und die Etikettierung.
Die in dieser Europäischen Norm beschriebenen Produkte werden auch in vorgefertigten Wärmedämmsystemen und Mehrschicht Verbundplatten angewendet. Die Eigenschaften von Systemen, in die diese Produkte integriert sind, werden nicht behandelt.
Diese Norm legt keine Leistungsstufen für eine vorgegebene Eigenschaft fest, die ein Produkt erreichen muss, um für einen bestimmten Anwendungsfall tauglich zu sein. Die für bestimmte Anwendungen benötigten Stufen und Klassen können Regelwerken oder übereinstimmenden Normen entnommen werden.
Diese Norm gilt nicht für Produkte, deren Nennwert des Wärmedurchlasswiderstandes niedriger als 0,15 m2K/W oder deren Nennwert der Wärmeleitfähigkeit größer als 0,100 W/(mK) bei 10 °C ist.
Diese Europäische Norm gilt weder für in situ Dämmstoffe noch für Produkte, die zur Dämmung von haus-technischen und betriebstechnischen Anlagen bestimmt sind.
Produits isolants thermiques pour le bâtiment - Produits manufacturés en laine de bois (WW) - Spécification
La présente Norme européenne spécifie les exigences auxquelles doivent satisfaire les produits manufacturés en laine de bois (WW), avec ou sans parements ou enduits de finition, utilisés pour l'isolation thermique des bâtiments. Les produits sont fabriqués sous forme de panneaux ou plaques.
La présente Norme européenne spécifie également les exigences relatives aux produits composites manufacturés à base de laine de bois en combinaison avec d'autres matériaux isolants.
La présente norme inclut les produits isolants WW multicouches. Les instructions de l'Annexe C doivent être suivies.
La présente Norme européenne décrit les caractéristiques de ces produits et comporte des modes opératoires d’essai, d’évaluation de conformité, de marquage et d’étiquetage.
Les produits couverts par la présente Norme européenne sont également utilisés dans des systèmes d’isolation thermique et dans des panneaux composites préfabriqués ; la performance des systèmes incorporant ces produits n’y est pas définie.
La présente norme ne spécifie pas, pour une propriété donnée, le niveau exigé que doit atteindre un produit pour démontrer son aptitude à l'emploi dans une application particulière. Les niveaux et classes requis pour une application donnée figurent dans les réglementations ou normes non conflictuelles.
Les produits dont la résistance thermique déclarée à une température de 10 °C est inférieure à 0,15 m2×K/W ou dont la conductivité thermique déclarée à une température de 10 °C est supérieure à 0,100 W/(m×K) ne relèvent pas du domaine d'application de la présente norme.
Les produits isolants mis en œuvre in situ et les produits destinés à être utilisés pour l'isolation des équipements du bâtiment et des installations industrielles ne relèvent pas du domaine d'application de la présente Norme européenne.
Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz lesne volne (WW) - Specifikacija
Ta evropski standard določa zahteve za površinsko obdelane ali lakirane ali površinsko neobdelane ali nelakirane proizvode iz lesne volne (WW), ki se uporabljajo za toplotno izolacijo stavb. Proizvodi so izdelani v obliki plošč ali blokov. Ta evropski standard določa tudi zahteve za kompozitne proizvode iz lesne volne in drugih izolacijskih materialov. Ta evropski standard opisuje lastnosti proizvodov ter zajema postopke za preskušanje, označevanje in etiketiranje. Proizvodi iz tega evropskega standarda se uporabljajo tudi v predizdelanih sistemih toplotne izolacije in vezanih ploščah; lastnosti sistemov iz teh proizvodov niso opisane. Ta standard ne določa zahtevane ravni določene lastnosti, ki jo mora proizvod doseči, da se dokaže njegova primernost namenu za posamezno vrsto uporabe. Zahtevane ravni in razredi za posamezno uporabo so določeni v uredbah ali standardih, ki niso v nasprotju s tem standardom. Proizvodi z deklarirano toplotno upornostjo, nižjo od 0,15 m² K/W, ali deklarirano toplotno prevodnostjo, višjo od 0,100 W/mK pri 10 °C, v tem evropskem standardu niso zajeti. Ta evropski standard ne zajema toplotnoizolacijskih proizvodov, izdelanih na kraju samem, ter proizvodov za izolacijo gradbene opreme in industrijskih napeljav.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Toplotnoizolacijski proizvodi za stavbe - Proizvodi iz lesne volne (WW) - SpecifikacijaWärmedämmstoffe für Gebäude - Werkmäßig hergestellte Produkte aus Holzwolle (WW) - SpezifikationProduits isolants thermiques pour le bâtiment - Produits manufacturés en laine de bois (WW) - SpécificationThermal insulation products for buildings - Factory made wood wool (WW) products - Specification91.100.60Thermal and sound insulating materialsICS:Ta slovenski standard je istoveten z:EN 13168:2012SIST EN 13168:2013en,fr,de01-marec-2013SIST EN 13168:2013SLOVENSKI
STANDARDSIST EN 13168:20091DGRPHãþD
SIST EN 13168:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13168
November 2012 ICS 91.100.60 Supersedes EN 13168:2008English Version
Thermal insulation products for buildings - Factory made wood wool (WW) products - Specification
Produits isolants thermiques pour le bâtiment - Produits manufacturés en laine de bois (WW) - Spécification
Wärmedämmstoffe für Gebäude - Werkmäßig hergestellte Produkte aus Holzwolle (WW) - Spezifikation This European Standard was approved by CEN on 6 October 2012.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13168:2012: ESIST EN 13168:2013
EN 13168:2012 (E) 2 Contents Page Foreword .41Scope .62Normative references .63Terms, definitions, symbols, units and abbreviated terms .73.1Terms and definitions .73.2Symbols, units and abbreviated terms .94Requirements . 114.1General . 114.2For all applications . 114.3For specific applications . 155Test methods . 195.1Sampling . 195.2Conditioning . 195.3Testing . 196Designation code . 217Evaluation of conformity . 227.1General . 227.2Initial type testing . 237.3Factory production control . 238Marking and labelling . 23Annex A (normative)
Determination of the declared values of thermal resistance and thermal conductivity . 25A.1General . 25A.2Input data . 25A.3Declared values. 25A.3.1General . 25A.3.2Case where thermal resistance and thermal conductivity are declared . 25A.3.3Case where thermal resistance alone is declared . 26Annex B (normative)
Initial type testing (ITT) and factory production control (FPC) . 28Annex C (normative)
WW multi-layered insulation products . 32C.1General . 32C.2Requirements . 32C.2.1 For all applications . 32C.2.1.1 General . 32C.2.1.2Thermal resistance . 32C.2.1.3Length and width, thickness, squareness, flatness . 32C.2.1.4. Reaction to fire . 32C.2.1.5Durability characteristics . 33C.2.2 For specific applications . 33C.3 Test methods . 33C.4 Evaluation of conformity . 33Annex D (normative)
Specific test methods . 34D.1Chloride content . 34D.2Load resistance. 345D.3Impact resistance. 35Annex E (normative)
Determination of the thermal conductivity in relation to moisture content. 37Annex ZA (informative)
Clauses of this European Standard addressing the provisions of the EU Construction Products Directive . 39SIST EN 13168:2013
EN 13168:2012 (E) 3 ZA.1Scope and relevant characteristics . 39BZA.2Procedures for attestation of conformity of factory made wood wool products . 41ZA.2.1Systems of attestation of conformity . 41ZA.2.2EC certificate and declaration of conformity . 43ZA.3CE Marking and labelling . 45Bibliography . 47Tables
Table 1 — Classes for length and width tolerances . 12Table 2 — Classes for thickness tolerances . 12Table 3 — Levels for deviation from flatness . 13Table 4 — Levels for chloride content . 13Table 5 — Levels for tensile strength perpendicular to faces . 14Table 6 — Levels for the deviation from squareness . 15Table 7 — Levels for compressive stress or compressive strength . 16Table 8 — Levels for bending strength . 17Table 9 — Levels for short term water absorption . 17Table 10 — Test methods, specimens and conditions . 20Table A.1 — Values for k for one sided 90 % tolerance interval with a confidence level of 90 % . 26Table B.1 — Minimum product testing frequencies. 28Table B.1— Minimum product testing frequencies. 29Table B.2 — Minimum product testing frequencies for the reaction to fire characteristics . 30Table ZA.1 — Relevant clauses for Wood wool and relevant clauses for WW multi-layered products and composite WW products with intended use . 40Table ZA.2 — Systems of attestation of conformity . 41Table ZA.3 — Assignment of evaluation of conformity tasks for products under system 1 for reaction to fire and system 3 for other characteristics . 42Table ZA.4 — Assignment of evaluation of conformity tasks for products under system 3 or system 3 combined with system 4 for reaction to fire . 43Figures
Figure D.1 — Test rig for load resistance of slabs . 35Figure D.2 — Test rig for impact resistance of slabs . 36Figure E.1 — Example of a graphic representation of “fψ” . 38Figure ZA.1 — Example CE marking information . 46SIST EN 13168:2013
EN 13168:2012 (E) 4 Foreword This document (EN 13168:2012) has been prepared by Technical Committee CEN/TC 88 “Thermal insulating materials and products”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2013, and conflicting national standards shall be withdrawn at the latest by May 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13168:2008. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. Compared with EN 13168:2008, the main changes are: a) better harmonisation between the individual standards of the package (EN 13162 to EN 13171) on definitions, requirements, classes and levels; b) new normative annex on multi-layered products; c) changes on some editorial and technical content and addition of information on some specific items such as for MW: lamella, compressibility, etc; d) addition of links to EN 15715, Thermal insulation products — Instruction for mounting and fixing for reaction to fire testing — Factory made products; e) changes of Annex ZA. This standard is one of a series of standards for insulation products used in buildings, but this standard may be used in other areas where appropriate. In pursuance of Resolution BT 20/1993 revised, CEN/TC 88 have proposed defining the standards listed below as a package of documents. The package of standards comprises the following group of interrelated standards for the specifications of factory made thermal insulation products, all of which come within the scope of CEN/TC 88: EN 13162, Thermal insulation products for buildings — Factory made mineral wool (MW) products — Specification EN 13163, Thermal insulation products for buildings — Factory made expanded polystyrene (EPS) products — Specification EN 13164, Thermal insulation products for buildings — Factory made extruded polystyrene foam (XPS) products — Specification EN 13165, Thermal insulation products for buildings — Factory made rigid polyurethane foam (PU) products — Specification SIST EN 13168:2013
EN 13168:2012 (E) 5 EN 13166, Thermal insulation products for buildings — Factory made phenolic foam (PF) products — Specification EN 13167, Thermal insulation products for buildings — Factory made cellular glass (CG) products — Specification EN 13168, Thermal insulation products for buildings — Factory made wood wool (WW) products — Specification EN 13169, Thermal insulation products for buildings — Factory made expanded perlite board (EPB) products — Specification EN 13170, Thermal insulation products for buildings — Factory made products of expanded cork (ICB) — Specification EN 13171, Thermal insulation products for buildings — Factory made wood fibre (WF) products — Specification The reduction in energy used and emissions produced during the installed life of insulation products exceeds by far the energy used and emissions made during the production and disposal processes. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 13168:2013
EN 13168:2012 (E) 6
1 Scope This European Standard specifies the requirements for factory made wood wool (WW) products, with or without facings or coatings, which are used for the thermal insulation of buildings. The products are manufactured in the form of boards or slabs. This European Standard also specifies the requirements for the factory made composite products, made from wood wool in combination with other insulation materials.
This European Standard describes product characteristics and includes procedures for testing, evaluation of conformity, marking and labelling. Products covered by this European Standard are also used in prefabricated thermal insulation systems and composite panels; the performance of systems incorporating these products is not covered. This standard does not specify the required level of a given property to be achieved by a product to demonstrate fitness for purpose in a particular application. The levels and classes required for a given application are to be found in regulations or non-conflicting standards. Products with a declared thermal resistance lower than 0,15 m2⋅K/W or a declared thermal conductivity greater than 0,100 W/(m⋅K) at 10 °C are not covered by this standard. This European Standard does not cover in situ insulation products and products intended to be used for the insulation of building equipment and industrial installations. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 822, Thermal insulating products for building applications — Determination of length and width EN 823, Thermal insulating products for building applications — Determination of thickness EN 824, Thermal insulating products for building applications — Determination of squareness EN 825, Thermal insulating products for building applications — Determination of flatness EN 826, Thermal insulating products for building applications — Determination of compression behaviour EN 1602, Thermal insulating products for building applications — Determination of the apparent density EN 1604, Thermal insulating products for building applications — Determination of dimensional stability under specified temperature and humidity conditions EN 1605, Thermal insulating products for building applications — Determination of deformation under specified compressive load and temperature conditions EN 1606, Thermal insulating products for building applications — Determination of compressive creep EN 1607, Thermal insulating products for building applications — Determination of tensile strength perpendicular to faces EN 1609, Thermal insulating products for building applications — Determination of short term water absorption by partial immersion SIST EN 13168:2013
EN 13168:2012 (E) 7 EN 12086:1997, Thermal insulating products for building applications — Determination of water vapour transmission properties EN 12089, Thermal insulating products for building applications — Determination of bending behaviour EN 12090, Thermal insulating products for building applications – Determination of shear behaviour EN 12430, Thermal insulating products for building applications — Determination of behaviour under point load EN 12667, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Products of high and medium thermal resistance EN 12939, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Thick products of high and medium thermal resistance EN 13172:2012, Thermal insulation products — Evaluation of conformity EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire tests EN 13820, Thermal insulating materials for building applications — Determination of organic content EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the thermal attack by a single burning item EN 15715:2009, Thermal insulation products — Instructions for mounting and fixing for reaction to fire testing — Factory made products EN ISO 354, Acoustics — Measurement of sound absorption in a reverberation room (ISO 354) EN ISO 1182, Reaction to fire tests for building products — Non-combustibility test (ISO 1182) EN ISO 1716, Reaction to fire tests for products — Determination of the gross heat of combustion (calorific value) (ISO 1716) EN ISO 9229:2007, Thermal insulation — Vocabulary (ISO 9229:2007) EN ISO 10456, Building materials and products — Hygrothermal properties — Tabulated design values and procedures for determining declared and design thermal values (ISO 10456) EN ISO 11654, Acoustics — Sound absorbers for use in buildings — Rating of sound absorption (ISO 11654) EN ISO 11925-2, Reaction to fire tests for building products — Ignitability of building products subjected to direct impingement of flame – Part 2: Single-flame source test (ISO 11925-2) ISO 16269-6:2005, Statistical interpretation of data — Part 6 Determination of statistical tolerance intervals 3 Terms, definitions, symbols, units and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 9229:2007 apply with exception or in addition of the following: SIST EN 13168:2013
EN 13168:2012 (E) 8 3.1.1
wood wool long shavings of wood, deriving from a shaving process which insures wood wool with parallel edges, where the length to width ratio is ≥ 20:1 3.1.2
inorganic cementing agent binders used for producing wood wool products are cement, combinations of cement and lime, magnesite and gypsum 3.1.3
wood wool board, wood wool slab rigid insulation product manufactured from loose wood wool, bonded with a mineral binder and compressed to its final thickness 3.1.4
composite wood wool slab composite insulation product in which wood wool is bonded with a mineral binder, on one or both face(s) to other insulating materials
EXAMPLE mineral wool, foamed rigid cellular plastics.
Note 1 to entry: The final thickness of the “two layer” or “three layer” products, produced in this way, is determined during manufacture.
Note 2 to entry: The wood wool layer(s) of composite wood wool slabs cover the bonded insulation layer completely. 3.1.5 level value which is the upper or lower limit of a requirement and given by the declared value of the characteristic concerned 3.1.6 class combination of two levels of the same property between which the performance shall fall 3.1.7 boards, slabs rigid or semi-rigid (insulation) product of rectangular shape and cross section in which the thickness is uniform and substantially smaller than the other dimensions Note 1 to entry: Boards are usually thinner than slabs. They may also be supplied in tapered form. 3.1.8 facing functional or decorative surface layer with a thickness of less than 3 mm, e.g. paper, plastic film, fabric or metal foil, which is not considered as separate thermal insulation layers to be added to the thermal resistance of the product 3.1.9 coating functional or decorative surface layer with a thickness of less than 3 mm usually applied by painting, spraying, pouring or trowelling, which is not considered as separate thermal insulation layers to be added to the thermal resistance of the product 3.1.10 composite insulation product product which can be faced or coated made from two or more layers bonded together by chemical or physical adhesion consisting of at least one factory made thermal insulation material layer SIST EN 13168:2013
EN 13168:2012 (E) 9 3.1.11 multi-layered insulation product product which can be faced or coated made from two or more layers of a thermal insulation material from the same European Standard, which are bonded together by chemical or physical adhesion either horizontally and/or vertically 3.2 Symbols, units and abbreviated terms For the purposes of this document, the following symbols and units apply. αp is the practical sound absorption coefficient – αw is the weighted sound absorption coefficient – b is the width mm d is the thickness mm dN is the nominal thickness of the product mm ∆εb is the relative change in width % ∆εd is the relative change in thickness % ∆εl is the relative change in length % Fp is the point load at a given deformation N k is a factor related to the number of test results – l is the length mm λ is the thermal conductivity W/(m⋅K) λ90/90 is a 90 % fractile with a confidence level of 90 % for the thermal conductivity W/(m⋅K) λD is the declared thermal conductivity W/(m⋅K) λi is one test result of thermal conductivity W/(m⋅K) λmean is the mean thermal conductivity W/(m⋅K) λU Is the design thermal conductivity W/(m⋅K) µ is the water vapour diffusion resistance factor – N is the number of test results – R90/90 is a 90 % fractile with a confidence level of 90 % for the thermal resistance m2⋅K/W RD is the declared thermal resistance m2⋅K/W Ri is one test result of thermal resistance m2⋅K/W Rmean is the mean thermal resistance m2·K/W RU Is the design thermal resistance m2·K/W ρa is the apparent density kg/m3 Sb is the deviation from squareness on length and width mm/m Smax is the deviation from flatness mm sR is the estimate of the standard deviation of the thermal resistance m2·K/W sλ is the estimate of the standard deviation of the thermal conductivity W/(m⋅K) SIST EN 13168:2013
EN 13168:2012 (E) 10 σ10 is the compressive stress at 10 % deformation kPa σb is the bending strength kPa σc is the compressive stress kPa σm is the compressive strength kPa σmt is the tensile strength perpendicular to faces kPa Wp is the short term water absorption kg/m2 χct is the compressive creep mm χt is the deformation at time t (total thickness reduction) mm Z is the water vapour resistance m2⋅h⋅Pa/mg AP is the symbol of the declared level of practical sound absorption coefficient AW is the symbol of the declared level of weighted sound absorption coefficient BS is the symbol of the declared level for bending strength
CC(i1/i2/y)σc
is the symbol of the declared level for compressive creep Cl is the symbol of the declared level for chloride content CS(10\Y)
is the symbol of the declared level for compressive stress or strength DS(L) is the symbol of the declared value for dimensional stability under specified load andtemperature conditions DS(TH) is the symbol of the declared dimensional stability at specified temperature and relative humidity conditions DS(70,-) is the symbol of the declared value for dimensional stability at specified temperature DS (23,90)
or DS (70,90) is the symbol of the declared value for dimensional stability under specified temperature and relative humidity conditions L is the symbol of the declared class for length tolerances MU is the symbol of the declared value for water vapour diffusion resistance factor P is the symbol of the declared value for flatness tolerances PL(2) is the symbol of the declared level of point load for 2 mm deformation S is the symbol of the declared class for squareness tolerances T is the symbol of the declared class for thickness tolerances TR is the symbol of the declared level for tensile strength perpendicular to faces W is the symbol of the declared class for width tolerances WS is the symbol of the declared level for short term water absorption Z is the symbol of the declared value for water vapour resistance Abbreviated terms used in this standard: WW is Wood Wool board, slab WW-C is Composite Wood Wool board, slab SIST EN 13168:2013
EN 13168:2012 (E) 11 WW-C/3 xx is 3-layered Composite Wood Wool board, slab in combination with xx. NOTE 1 xx stands for the suitable insulation material used. WW-C/3 MW (5/9
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