oSIST prEN 14732:2011

SLOVENSKI STANDARD
01-marec-2011
Lesene konstrukcije - Montažne stene, stropni in strešni elementi - 1. del: Zahteve
Timber structures - Prefabricated wall, floor and roof elements - Requirements
Holzbauwerke - Vorgefertigte Wand-, Decken- und Dachelemente - Anforderungen
Structures en bois - Eléments de mur, de plancher et de toiture préfabriqués - Exigences
Ta slovenski standard je istoveten z: prEN 14732
ICS:
91.060.01 Stavbni elementi na splošno Elements of buildings in
general
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
prEN 14732
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2011
ICS 91.060.01; 91.080.20
English Version
Timber structures - Prefabricated wall, floor and roof elements -
Requirements
Structures en bois - Eléments de mur, de plancher et de Holzbauwerke - Vorgefertigte Wand-, Decken- und
toiture préfabriqués - Exigences Dachelemente - Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 124.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14732:2011: E
worldwide for CEN national Members.

prEN 14732:2011 (E)
Contents Page
Foreword .2
1 Scope .6
2 Normative references .6
3 Terms and definitions .9
4 Symbols . 11
5 Requirements for components . 11
5.1 Framing members . 11
5.1.1 Structural timber . 11
5.1.2 Finger jointed timber . 11
5.1.3 Glued laminated timber . 12
5.1.4 Laminated veneer lumber (LVL) . 12
5.1.5 Structural, prefabricated beams and columns . 12
5.2 Panels and/or boards . 12
5.2.1 Wood-based panels . 12
5.2.2 Gypsum boards . 12
5.3 Adhesives . 12
5.3.1 General . 12
5.3.2 Phenolic, melamine or melamine-urea adhesives . 13
5.3.3 Moisture curing one component polyurethane adhesives . 13
5.4 Mechanical fasteners and connectors. 13
5.5 Thermal insulation materials and systems . 13
5.6 Vapour barriers . 13
6 Requirements for prefabricated elements . 13
6.1 General . 13
6.2 Mechanical resistance of the elements . 14
6.2.1 General . 14
6.2.2 Determination and declaration . 14
6.3 Bonding strength . 14
6.3.1 Bond line integrity and shear strength . 14
6.3.2 Strength of mechanical fixing . 15
6.4 Thermal insulation properties . 15
6.5 Vapour barrier properties . 15
6.6 Fire performance. 16
6.6.1 Reaction to fire . 16
6.6.2 Fire resistance . 16
6.7 Release of dangerous substances . 17
6.7.1 General . 17
6.7.2 Release of formaldehyde . 18
6.7.3 Pentachlorophenol content . 18
6.8 Durability . 18
6.8.1 General . 18
6.8.2 Structural timber, glued laminated timber, LVL and wood-based panels . 18
6.8.3 Steel parts . 18
6.9 Tolerances . 18
6.9.1 Elements and openings . 18
6.9.2 Spacing and edge distances of mechanical fasteners . 20
6.9.3 Bond line thicknesses . 20
6.10 Moisture content of element components . 20
7 Manufacturing requirements . 20
prEN 14732:2011 (E)
7.1 Element construction . 20
7.2 Premises . 20
7.2.1 General . 20
7.2.2 Storage . 20
7.2.3 Additional requirements for production of adhesive bonded elements . 20
7.3 Equipment . 21
7.3.1 General . 21
7.3.2 Additional requirements for adhesively bonded elements . 21
7.4 Materials . 21
7.4.1 Moisture content of timber and glulam products . 21
7.4.2 Insulation products . 21
7.5 Production . 21
7.5.1 Tolerances of elements . 21
7.5.2 Assembly of framework and panels . 21
7.5.3 Assembling by bonding . 22
7.6 Element documents . 22
8 Evaluation of conformity . 22
8.1 General . 22
8.2 Initial type testing (ITT) . 22
8.3 Factory production control (FPC) . 24
8.3.1 General . 24
8.3.2 FPC requirements for all manufacturers . 24
8.3.3 Manufacturer-specific FPC system requirements . 24
9 Marking and labelling . 27
Annex A (normative) Bond line shear strength test for adhesively fixed joist-panel bonds . 28
A.1 General . 28
A.2 Glue line shear test . 28
A.2.1 Principle. 28
A.2.2 Testing machine . 28
A.3 Specimen preparation . 28
A.4 Procedure . 29
A.5 Results . 29
A.6 Test report . 29
Annex B (normative) Requirements for bonding and cramping . 32
B.1 Bonding requirements . 32
B.2 Cramping requirements . 32
Annex C (normative) Bond strength evaluation . 33
C.1 Calculation . 33
C.2 Control chart . 33
C.3 Conformity. 33
Annex D (normative) Additional requirements for gap filling adhesives and for one-component
polyurethane adhesives and relevant test methods . 34
D.1 General . 34
D.2 Additional tensile shear tests for glue line thicknesses up to 2 mm . 34
D.3 Additional long-term sustained load test under cyclic climate conditions with specimens
loaded perpendicular to the glue line for glue line thicknesses up to 2 mm . 34
D.4 Additional long-term sustained load test under cyclic climate conditions with specimens
loaded perpendicular to the glue line . 34
D.4.1 General description . 34
D.4.2 Preparation of the specimens . 35
D.4.3 Test procedure and climate conditions . 35
D.4.4 Requirements . 36
Annex E (normative) Reaction to fire performance - Classified without further testing (CWFT) . 37
E.1 General . 37
E.2 Structural timber, glulam, wood-based panels . 37
E.3 Gypsum plasterboards . 40
prEN 14732:2011 (E)
E.3.1 Classification . 40
E.3.2 Mounting and fixing . 41
Annex F (normative) Treatment of mechanical resistance and fire resistance . 43
F.1 Initial type testing (ITT), including initial type calculation (ITC) . 43
F.1.1 Prefabricated element under attestation of conformity (AoC) system 1 . 43
F.1.2 Product under AoC system 2+ . 43
F.2 Factory production control (FPC) . 44
F.2.1 Product under AoC system 1 . 44
F.2.2 Product under AoC system 2+ . 44
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive . 46
ZA.1 Scope and relevant characteristics . 46
ZA.2 Procedure for attestation of conformity of prefabricated structural wall, floor and roof
elements . 49
ZA.2.1 Systems of attestation of conformity . 49
ZA.2.2 EC certificate of conformity and EC declaration of conformity . 53
ZA.3 CE marking and labelling . 54
Bibliography . 64
prEN 14732:2011 (E)
Foreword
This document (prEN 14732:2011) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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 89/106/EEC.
For relationship with EU Directive 89/106/EEC, see informative Annex ZA which is an integral part of this
document.
prEN 14732:2011 (E)
1 Scope
This European Standard specifies performance requirements at delivery for prefabricated structural (load-
bearing) wall, floor and roof elements (diaphragm assemblies) consisting of framing members of timber and/or
wood-based panels or boards on one or both sides, for use in service class 1 or 2 in accordance with
EN 1995-1-1:2004. The panels and/or boards are connected to the joists by suitable adhesive bonding or by
mechanical fixing. The cavities of the elements may be filled entirely or partially with insulating materials. The
exterior faces of the elements may also be covered with insulation material.
This European Standard applies to elements with lengths and cross-sectional depths of up to 10 m and
0,30 m, respectively.
This European Standard specifies requirements for structural (3.3) and non-structural (3.4) components and
lays down minimum requirements for the production of prefabricated elements.
The European Standard also covers methods to carry out the evaluation of conformity and marking of these
elements.
This European Standard applies to elements that may have openings, e. g. for windows, doors etc. It does not
apply to the properties of incorporated doors or windows.
Furthermore, it does not cover elements treated to enhance their fire performance.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 300, Oriented strand boards (OSB) — Definitions, classification and specifications
EN 301, Adhesives, phenolic and aminoplastic, for load-bearing structures — Classification and performance
requirements
EN 302-1, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of bond
strength in longitudinal tensile shear strength
EN 302-2, Adhesives for load-bearing timber structures — Test methods — Part 2: Determination of
resistance to delamination
EN 302-3, Adhesives for load-bearing timber structures — Test methods — Part 3: Determination of the effect
of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength
EN 302-4, Adhesives for load-bearing timber structures — Test methods — Part 4: Determination of the
effects of wood shrinkage on the shear strength
EN 302-6, Adhesives for load-bearing timber structures — Test methods — Part 6: Determination of the
conventional pressing time
EN 312, Particleboards — Specifications
EN 335-1, Durability of wood and wood-based products — Definition of use classes — Part 1: General
EN 335-2, Durability of wood and wood-based products — Definition of use classes — Part 2: Application to
solid wood
prEN 14732:2011 (E)
EN 335-3, Durability of wood and wood-based products — Definition of use classes — Part 3: Application to
wood-based panels
EN 336, Structural timber — Sizes, permitted deviations
EN 350-1, Durability of wood and wood-based products — Natural durability of solid wood — Part 1: Guide to
the principles of testing and classification of the natural durability of wood
EN 350-2, Durability of wood and wood-based products — Natural durability of solid wood — Part 2: Guide to
natural durability and treatability of selected wood species of importance in Europe
EN 351-1, Durability of wood and wood-based products — Preservative-treated solid wood — Part 1:
Classification of preservative penetration and retention
EN 386, Glued laminated timber — Performance requirements and minimum production requirements
EN 408, Timber structures — Structural timber and glued laminated timber — Determination of some physical
and mechanical properties
EN 460-1, Durability of wood and wood-based products — Preservative-treated solid wood — Part 1:
Classification of preservative penetration and retention
EN 520, Gypsum plasterboards — Definitions, requirements and test methods
EN 594, Timber structures — Test methods — Racking strength and stiffness of timber frame wall panels
EN 596, Timber structures — Test methods — Soft body impact test of timber framed walls
EN 622-2, Fibreboards — Specifications — Part 2: Requirements for hardboards
EN 622-3, Fibreboards — Specifications — Part 3: Requirements for medium boards
EN 622-4, Fibreboards — Specifications — Part 4: Requirements for softboards
EN 622-5, Fibreboards — Specifications — Part 5: Requirements for dry process boards (MDF)
EN 634-1, Cement-bonded particleboards — Specifications — Part 1: General requirements
EN 634-2, Cement-bonded particleboards — Specifications — Part 2: Requirements for OPC bonded
particleboards for use in dry, humid and external conditions
EN 636, Plywood — Specifications
EN 717-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde emission
by the chamber method
EN 1195, Timber structures — Test methods — Performance of structural floor decking
EN 1365-1, Fire resistance tests for loadbearing elements — Part 1: Walls
EN 1365-2, Fire resistance tests for loadbearing elements — Part 2: Floors and roofs
EN 1931, Flexible sheets for waterproofing — Bitumen, plastic and rubber sheets for roof waterproofing —
Determination of water vapour transmission properties
EN 1990, Eurocode: Basis of structural design
EN 1995-1-1:2004, Eurocode 5: Design of timber structures — Part 1-1: General rules and rules for buildings
prEN 14732:2011 (E)
EN 1995-1-2, Eurocode 5: Design of timber structures — Part 1-2: General rules — Structural fire design
EN 12524, Building materials and products — Hygrothermal properties — Tabulated design values
EN 12871, Wood-based panels — Performance specifications and requirements for load bearing boards for
use in floors, walls and roofs
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 13162, Thermal insulation products for buildings — Factory made mineral wool (MW) products —
Specification
EN 13163, Thermal insulation products for buildings — Factory made products of expanded polystyrene foam
(EPS) — Specification
EN 13164, Thermal insulation products for buildings — Factory made products of extruded polystyrene foam
(XPS) — Specification
EN 13165, Thermal insulation products for buildings — Factory made products of rigid polyurethane foam
(PUR) — Specification
EN 13166, Thermal insulation products for buildings — Factory made products from phenolic foam (PF) —
Specification
EN 13167, Thermal insulation products for buildings — Factory made cellular glass products (CG) —
Specification
EN 13168, Thermal insulation products for buildings — Factory made wood wool products (WW) —
Specification
EN 13169, Thermal insulation products for buildings — Factory made products of expanded perlite (EPB) —
Specification
EN 13170, Thermal insulation products for buildings — Factory made products of cork (ICB) — Specification
EN 13171, Thermal insulation products for buildings — Factory made wood fibre products (WF) —
Specification
EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance method
EN 13353, Solid wood panels (SWP) — Requirements
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using
test data from reaction to fire tests
EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification using
data from fire resistance tests, excluding ventilation services
EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the
thermal attack by a single burning item
EN 13963, Jointing materials for gypsum plasterboards — Definitions, requirements and test methods
EN 13984, Flexible sheets for waterproofing — Plastic and rubber vapour control layers — Definitions and
characteristics
prEN 14732:2011 (E)
EN 13986, Wood-based panels for use in construction — Characteristics, evaluation of conformity and
marking
EN 14080, Timber structures — Glued laminated timber — Requirements
EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section — Part 1:
General requirements
EN 14279, Laminated Veneer Lumber (LVL) — Definitions, classification and specifications
EN 14374, Timber structures — Structural laminated veneer Lumber — Requirements
EN 14469, Gypsum based adhesives for thermal/acoustic insulation composite panels and plasterboards —
Definitions, requirements and test methods
EN 14545, Timber structures — Connectors — Requirements
EN 14592, Timber structures — Fasteners — Requirements
EN 15283-2, Gypsum boards with fibrous reinforcement — Definitions, requirements and test methods —
Part 2: Gypsum fibre boards
EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test
methods — Part 5: Determination of conventional pressing time
EN 15425, Adhesives — One component polyurethane for load bearing timber structures — Classification and
performance requirements
EN 15497, Finger-jointed structural timber — Performance requirements and minimum production
requirements
EN ISO 9001:2008, Quality management systems — Requirements (ISO 9001:2008)
EN ISO 12572, Hygrothermal performance of building materials and products — Determination of water
vapour transmission properties
ISO 8258, Shewhart control charts
ETAG 004, Guideline for European technical approval for external thermal insulation composite systems with
rendering
ETAG 011, Guideline for European technical approval for light composite wood-based beams and columns
ETAG 015, Guideline for European technical approval for three-dimensional nailing plates
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply:
3.1
batch
all elements produced to the same specifications in one shift

3.2
element
prefabricated load bearing member comprising various structural and non-structural components that are
mechanically jointed or adhesively bonded
NOTE An element may be used for exterior and interior walls, roofs and floors and can have openings (for windows,
doors, etc.). Examples of typical constructions are shown in Figure 1.
prEN 14732:2011 (E)
3.3
non-structural component
any material permanently installed/fixed to the element not intentionally contributing to the structural
composite behaviour but contributing to thermal insulation
3.4
structural component
wood-based joists, light composite wood-based beams and columns, wood-based panels and panels made of
gypsum plaster board intended to contribute to the structural composite behaviour of an element (see Figure 1)
3.5
gap filling adhesive
adhesive suitable for glue line thicknesses up to 2 mm

Key
1 panel product, e.g. plywood, OSB etc.
2 framing member, e.g. structural timber, glued laminated timber or wood-based product
3 adhesive bonded joint
4 insulation
5 fastener (e.g. nail, staple or screw)
6 exterior non-structural cladding
7 vapour barrier
8 watertight breather membrane
Figure 1 — Examples of the construction of a typical element
prEN 14732:2011 (E)
4 Symbols
A shear area
B width of floor or roof element
D diagonal length of wall, floor or roof elements
F ultimate load
u
H height of wall element
L length of wall, floor or roof element
O , O , O opening dimensions of wall, floor or roof elements
1 2 3
T (cross-sectional) thickness of element
b width of framing member
f shear strength
v
h depth of framing member
l length of sheared bond line, parallel to applied force
t t thicknesses of panels 1 and 2
1, 2
t , t thicknesses of glued-on reinforcement panels of compression shear specimen
r1 r2
w width of panel of compression shear specimen
5 Requirements for components
5.1 Framing members
5.1.1 Structural timber
Structural timber, whether untreated or treated against biological attack, shall comply with EN 14081-1. As a
minimum, the tolerances of this timber shall conform to EN 336, class 2.
NOTE 1 Production requirements may require stricter tolerances.
In the case of adhesive bonded elements, only species proven to be suitable for bonding shall be used.
NOTE 2 Species suitable for the production of bond lines of sufficient strength are:
Spruce (Picea abies), Fir (Abies alba), Scots pine redwood (Pinus sylvestris), Douglas fir (Pseudotsuga menziesii),
Western Hemlock (Tsuga heterophylla), Corsican pine and Austrian black pine (Pinus nigra), Larch (Larix decidua),
Maritime pine (Pinus pinaster), Poplar (Populus robuste, Populus elba), Radiata-Pine (Pinus radiata), Sitka-spruce (Picea
sitchensis), Southern Yellow pine (Pinus palustris), Western Red Cedar (Thuja plicata), Yellow Cedar (Chamaecyparis
nootkatensis).
5.1.2 Finger jointed timber
Finger jointed timber shall comply with EN 15497.
NOTE Production requirements may require stricter tolerances.
prEN 14732:2011 (E)
5.1.3 Glued laminated timber
Glued laminated timber shall comply with EN 14080.
NOTE Production requirements may require stricter tolerances.
5.1.4 Laminated veneer lumber (LVL)
Structural LVL shall comply with EN 14374.
NOTE Production requirements may require stricter tolerances.
5.1.5 Structural, prefabricated beams and columns
Light composite wood-based beams and columns shall comply with the provisions in ETAG 011.
5.2 Panels and/or boards
5.2.1 Wood-based panels
Panels, whether untreated or treated against biological attack, used for load bearing purposes shall conform
to EN 13986.
Tolerances shall as a minimum comply with EN 12871.
NOTE Wood-based panels according to EN 13986 include solid wood panels (EN 13353), OSB (EN 300),
particleboards (EN 312), cement bonded particleboards (EN 634-1 and EN 634-2), plywood (EN 636), fibreboards
(EN 622-2 to EN 622-5) and LVL (EN 14279).
5.2.2 Gypsum boards
Load-bearing gypsum plasterboards shall comply with EN 520 or EN 15283-2.
5.3 Adhesives
5.3.1 General
Adhesives for adhesively bonded elements shall permit the production of bonds of such strength and durability
that integrity is maintained throughout the intended lifetime of the structure in the relevant service class
according to EN 1995-1-1.
The adhesive shall be chosen considering the climatic conditions in service, the timber species, the type of
panel, the preservative used (if any) and the production methods. For elements used in service class 1, type I
or type II adhesives according to EN 301 or EN 15425 shall be used. For elements used in service class 2,
type I adhesives according to EN 301 or EN 15425 shall be used.
The following types of adhesive are applicable:
a) phenolic, melamine or melamine-urea adhesives in accordance with 5.3.2;
b) moisture curing one component polyurethane adhesives in accordance with 5.3.3.
If a preservative treatment is applied to the structural timber before bonding of the element, it shall be
documented that the requirements for the combination of the preservative and adhesive are fulfilled.
It shall be documented that all relevant documentation of the adhesive manufacturer demonstrating the
suitability of the adhesive for the respective production conditions are followed.
prEN 14732:2011 (E)
5.3.2 Phenolic, melamine or melamine-urea adhesives
5.3.2.1 General requirements
Phenolic, melamine or melamine-urea adhesives shall be tested according to EN 302-1 to EN 302-4 and
EN 302-6 and shall meet the requirements stated in EN 301.
The separate application of resin and hardener for the production of glue lines is not allowed.
5.3.2.2 Additional requirements for gap filling adhesives
In addition to the requirement of 5.3.2.1, the following requirements shall be fulfilled:
a) requirements in D.2 for the results of the tests specified in D.2, and
b) requirements in D.4 for the tests specified in D.3 and D.4.
5.3.3 Moisture curing one component polyurethane adhesives
Moisture curing one component polyurethane adhesives shall fulfil the requirements of EN 15425. Additionally,
the requirements in D.4 for the tests specified therein shall be fulfilled.
The influence of the climate on the conventional pressing time shall be verified in accordance with
EN 15416-5.
5.4 Mechanical fasteners and connectors
For structural purposes mechanical fasteners shall conform to EN 14592 and connectors to EN 14545 or
European technical approval (according to ETAG 015).
The corrosion protection shall as a minimum correspond to EN 1995-1-1:2004, service class 2.
It shall be verified that the fastener and connector materials and wood or preservative treated products are
compatible.
5.5 Thermal insulation materials and systems
Thermal insulation materials shall comply with the requirements of EN 13162, EN 13163, EN 13164,
EN 13165, EN 13166, EN 13167, EN 13168, EN 13169, EN 13170 or EN 13171. Thermal insulation systems
shall comply with other appropriate European technical approval according to ETAG 004.
5.6 Vapour barriers
Vapour barrier properties shall comply with EN 13984 or shall be verified according to EN ISO 12572.
6 Requirements for prefabricated elements
6.1 General
Elements shall be designed and produced in such a way that, during their intended service life and with the
appropriate degrees of reliability, they:
 resist all actions and influences likely to occur during execution and use, and
 remain fit for their intended use.
These general requirements shall be considered satisfied if the requirements for the materials in Clause 5 and
the minimum production requirements in Clause 7 are met.
prEN 14732:2011 (E)
6.2 Mechanical resistance of the elements
6.2.1 General
The mechanical resistance of the prefabricated structural wall, floor and roof element covered by this
European Standard shall be determined and declared in terms of:
 load-bearing capacity and
 stiffness (declared normally as deflection for a specified load /unit load).
6.2.2 Determination and declaration
The mechanical resistance (i.e. load-bearing capacity and stiffness) of the prefabricated wall, floor and roof
elements shall be determined and declared in accordance with one of the following methods:
a) Method 1: By reference to dated drawings of the prefabricated wall, floor and roof elements with the
information on the geometrical data and values of the material properties of the structural
components and the data on the fasteners or adhesives used that is needed to calculate the
characteristic load-bearing capacities and stiffnesses of the prefabricated wall, floor and roof
elements in accordance with the method(s) valid in the member state of the intended use,
e. g. according to EN 1995-1-1 with possible reference to its relevant national annexes
defining the Nationally Determined Parameters, if any.
NOTE 1 This method complies with Method 1 in Guidance Paper L. By this method the characteristic mechanical
resistance is indirectly declared. It may be relevant for a prefabricated wall, floor and roof element manufactured in long
series, i.e. off-the-shelf elements grouped into product families, according to the manufacturer’s specification and placed
on the market, e.g. for retail, where the place of its intended use is not known.
b) Method 3a: By declaring compliance with the given production documents of the prefabricated wall, floor
and roof elements, together with the information on the purchaser and the party responsible
for the structural design of the element.
NOTE 3 This method complies with Method 3a in Guidance Paper L. By this method the characteristic mechanical
resistance is indirectly declared. It may be relevant for prefabricated wall, floor and roof elements made to measure
according to the specific purchaser’s order and where the place of its intended use is known.
c) Method 3b: By declaring compliance with the given structural design specification of the prefabricated
wall, floor and roof element showing that the element is able to resist all actions; the specified
deflection limits shall be satisfied. By declaring compliance with given structural design
specification of the prefabricated wall, floor and roof element produced and held by the
manufacturer showing that the element designed according to the standards of the member
state of the intended use (e.g. EN 1990) is able to resist all relevant actions and satisfies
specified serviceability requirements.
NOTE 4 This method complies with Method 3b in Guidance Paper L. By this method the characteristic mechanical
resistance is indirectly declared. It may be relevant for prefabricated wall, floor and roof elements made to measure
according to the structural design specifications prepared by the manufacturer and where the place of their intended use is
known.
6.3 Bonding strength
6.3.1 Bond line integrity and shear strength
For structural elements, made with structural glued timber (i.e. adhesive bonded) the integrity of the bond line
connecting joists and panels shall be determined by tests as specified in Annex A and declared as
characteristic bond shear strength value and minimum wood-failure percentage.
prEN 14732:2011 (E)
Alternative procedures may be used to determine the bond properties provided that a statistically significant
relationship between the test results obtained by the alternative method and the results obtained according to
Annex A can be demonstrated by initial type testing.
The lower 5-percentile of the bond shear strengths of the last 30 specimens of each production line
determined according to Annex C shall be equal to or greater than the characteristic value (specification limit).
The specification limit shall at least comply with the minimum characteristic bond shear strength values
specified in Table 1. No individual bond shear strength value shall be more than 10 % below the minimum
characte
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