SIST EN 1520:2026
(Main)Precast lightweight concrete products with an open structure
General Information
- Abstract
This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended to be used as structural element:
— solid, hollow core and multilayer load-bearing wall elements;
— retaining wall elements, excluding retaining walls intended to retain tanks or reservoirs of liquids and diaphragm walls (concrete sheet piling);
— solid, hollow core and multilayer roof elements, excluding ribbed floor elements and floor slabs elements;
— solid, hollow core and multilayer floor elements excluding floor elements with the intended use to carry traffic loads;
— solid and hollow core beams;
— solid piers.
This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended for not to be used as structural use:
— solid, hollow core and multilayer non-loadbearing wall elements;
— cladding elements;
— rectangular cross-section box culverts;
— components for noise barriers.
NOTE In addition to their loadbearing and encasing function, elements can also be used to provide fire resistance, sound insulation and thermal insulation.
Recycled lightweight concrete with an open structure (other than closed-loop recycling during production) is covered by this document.
- Status
- Published
- Public Enquiry End Date
- 25-Sep-2025
- Publication Date
- 07-Sep-2026
- Technical Committee
- BBB - Concrete, reinforced concrete and prestressed concrete
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 25-Aug-2026
- Due Date
- 30-Oct-2026
- Completion Date
- 08-Sep-2026
Overview
SIST EN 1520:2026 - Precast Lightweight Concrete Products with an Open Structure defines requirements for precast concrete elements produced with lightweight aggregate concrete having an open or porous structure. These products can be manufactured either in factories or on temporary site plants under controlled conditions. The standard covers elements with a wide range of dry densities, from 400 to 2000 kg/m³, addressing both structural and non-structural uses.
The document applies to a variety of precast lightweight concrete products, including load-bearing and non-load-bearing wall elements, beams, piers, roof elements, floor elements (excluding those designed for traffic loads), retaining wall elements, cladding elements, box culverts, and noise barrier components. Recycled and reused lightweight concrete products with open structures are also included within the scope of this standard.
Key Topics
SIST EN 1520:2026 standardizes the essential properties and performance criteria vital to quality, safety, and durability of precast lightweight concrete elements:
- Material Properties: Addresses requirements on composition, compressive strength, dry density, modulus of elasticity, drying shrinkage, and creep performance specific to lightweight concrete with an open structure.
- Mechanical Strength: Sets out testing and assessment methods for load-bearing capacity, joint rigidity (both in-plane and out-of-plane shear), and mechanical stability of different element types.
- Fire, Thermal, and Acoustic Performance: Covers fire resistance classes, thermal insulation, water vapour permeability, and sound insulation/absorption. These properties ensure that the elements meet building regulations for fire safety, energy efficiency, and noise control.
- Durability and Safety: Specifies requirements for freeze-thaw resistance, corrosion protection of embedded reinforcements, and the release of dangerous substances, supporting long-term environmental and structural integrity.
- Environmental Sustainability: Introduces principles for assessing the environmental impact, including resource use, life cycle assessment, waste, and biogenic carbon content.
- Assessment and Verification Procedures: Outlines criteria and processes for factory production control, test sampling, and conformity assessment to guarantee consistent product quality.
Applications
Precast lightweight concrete elements with an open structure provide versatile solutions across multiple sectors of the construction industry:
- Structural Uses:
- Solid, hollow core, and multilayer load-bearing wall, floor, and roof elements.
- Retaining walls (excluding types for liquid tanks or diaphragm walls), beams, and piers supplying essential stability and load resistance.
- Non-Structural Uses:
- Cladding, non-load-bearing walls, noise barriers, and box culverts, supporting both functional and architectural demands.
- Performance Features:
- Enhanced fire resistance, thermal insulation, and acoustic properties, making these products suitable for residential, commercial, and infrastructure projects.
- Can incorporate recycled aggregates and reused elements, supporting green building objectives.
By specifying performance requirements regardless of manufacturing environment, the standard supports both factory-made and on-site temporary plant productions, providing flexibility and quality assurance to diverse project needs.
Related Standards
SIST EN 1520:2026 references and aligns with several important European and international standards, ensuring comprehensive product assessment and inter-standard compatibility. Key related standards include:
- EN 206: Concrete - Specification, performance, production, and conformity
- EN 13501 Series: Fire classification of construction products and building elements
- EN 12390 Series: Testing hardened concrete
- EN 1745 & EN ISO 6946: Determining and calculating thermal properties
- EN ISO 717 & EN ISO 12354 Series: Rating and estimating sound insulation and building acoustics
- EN 15804: Environmental Product Declarations for construction products
For a full list of test methods and cross-references, consult Annexes and normative references within SIST EN 1520:2026.
Keywords: precast lightweight concrete, open structure, structural elements, noise barriers, thermal insulation, fire resistance, durability, recycled concrete, environmental assessment, SIST EN 1520:2026, European standard, construction products.
Relations
- Effective Date
- 01-Oct-2026
- Effective Date
- 16-Sep-2026
- Effective Date
- 09-Sep-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 12-Aug-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 28-Jan-2026
Get Certified
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German Institute for Building Technology.
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Frequently Asked Questions
SIST EN 1520:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Precast lightweight concrete products with an open structure". This standard covers: This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended to be used as structural element: — solid, hollow core and multilayer load-bearing wall elements; — retaining wall elements, excluding retaining walls intended to retain tanks or reservoirs of liquids and diaphragm walls (concrete sheet piling); — solid, hollow core and multilayer roof elements, excluding ribbed floor elements and floor slabs elements; — solid, hollow core and multilayer floor elements excluding floor elements with the intended use to carry traffic loads; — solid and hollow core beams; — solid piers. This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended for not to be used as structural use: — solid, hollow core and multilayer non-loadbearing wall elements; — cladding elements; — rectangular cross-section box culverts; — components for noise barriers. NOTE In addition to their loadbearing and encasing function, elements can also be used to provide fire resistance, sound insulation and thermal insulation. Recycled lightweight concrete with an open structure (other than closed-loop recycling during production) is covered by this document.
This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended to be used as structural element: — solid, hollow core and multilayer load-bearing wall elements; — retaining wall elements, excluding retaining walls intended to retain tanks or reservoirs of liquids and diaphragm walls (concrete sheet piling); — solid, hollow core and multilayer roof elements, excluding ribbed floor elements and floor slabs elements; — solid, hollow core and multilayer floor elements excluding floor elements with the intended use to carry traffic loads; — solid and hollow core beams; — solid piers. This document covers, regardless of if manufactured in factories or in temporary plants on site under the same conditions, precast concrete elements made of lightweight concrete with an open structure, and with a dry density between 400 and 2000 kg/m3, intended for not to be used as structural use: — solid, hollow core and multilayer non-loadbearing wall elements; — cladding elements; — rectangular cross-section box culverts; — components for noise barriers. NOTE In addition to their loadbearing and encasing function, elements can also be used to provide fire resistance, sound insulation and thermal insulation. Recycled lightweight concrete with an open structure (other than closed-loop recycling during production) is covered by this document.
SIST EN 1520:2026 is classified under the following ICS (International Classification for Standards) categories: 91.100.30 - Concrete and concrete products. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 1520:2026 has the following relationships with other standards: It is inter standard links to SIST EN 1520:2011, SIST EN 18185:2026, SIST-TS CEN/TS 12390-9:2017, SIST EN ISO 11925-2:2026, SIST EN 16637-2:2024, SIST EN 1741:2001, SIST EN 1737:2001, SIST EN 1740:2001, SIST EN 1742:2001, SIST EN 1354:2005, SIST EN ISO 16965:2026. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1520:2026 is associated with the following European legislation: EU Directives/Regulations: 305/2011; Standardization Mandates: M/100, M/609. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 1520:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2026
Nadomešča:
SIST EN 1520:2011
Montažni lahki betonski proizvodi z odprto strukturo
Precast lightweight concrete products with an open structure
Fertigteile aus haufwerksporigem Leichtbeton
Produits préfabriqués en béton de granulats légers à structure ouverte
Ta slovenski standard je istoveten z: EN 1520:2026
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 1520
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 91.100.30 Supersedes EN 1520:2011
English Version
Precast lightweight concrete products with an open
structure
Produits préfabriqués en béton de granulats légers à Vorgefertigte Bauteile aus haufwerksporigem
structure ouverte Leichtbeton
This European Standard was approved by CEN on 22 June 2026.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1520:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 9
3.1 Terms and definitions . 9
3.2 Symbols . 10
3.2.1 General symbols . 10
3.2.2 Subscripts . 10
3.2.3 Symbols used in this document . 10
3.3 Abbreviations . 11
4 Characteristics . 11
4.1 Concrete . 11
4.1.1 Compressive strength lightweight concrete with an open structure . 11
4.1.2 Dry density lightweight concrete with an open structure . 11
4.1.3 Modulus of elasticity lightweight concrete with an open structure - testing . 11
4.1.4 Modulus of elasticity lightweight concrete with an open structure - calculation . 11
4.1.5 Drying shrinkage lightweight concrete with an open structure- testing . 11
4.1.6 Drying shrinkage lightweight concrete with an open structure – tabulated values . 12
4.1.7 Creep lightweight concrete with an open structure - testing . 12
4.1.8 Freeze–thaw resistance of concrete . 12
4.1.9 Corrosion protection . 12
4.2 Reinforcing steel . 12
4.2.1 Elongation at maximum load — reinforcing steel . 12
4.2.2 Elongation after fracture — reinforcing steel . 12
4.2.3 Stress ratio — reinforcing steel . 12
4.2.4 Tensile yield strength — reinforcing steel . 12
4.2.5 Ultimate tensile strength — reinforcing steel . 13
4.3 Mechanical performance. 13
4.3.1 Mechanical strength — testing — lightweight concrete with an open structure —
longitudinal load . 13
4.3.2 Mechanical strength — testing — lightweight concrete with an open structure —
rigidity of joints–in-plane-shear. 13
4.3.3 Mechanical strength — testing — lightweight concrete with an open structure —
rigidity of joints — out-of-plane-shear . 13
4.4 Fire performance . 13
4.4.1 Reaction to fire. 13
4.4.2 Resistance to fire . 14
4.5 Thermal performance . 14
4.5.1 Thermal conductivity lightweight concrete with an open structure — testing . 14
4.5.2 Thermal conductivity lightweight concrete with an open structure — tabulated
values . 14
4.6 Water performance . 15
4.6.1 Water vapour permeability — resistance factor — testing . 15
4.6.2 Water vapour permeability — resistance factor — tabulated values . 15
4.7 Acoustic performance . 15
4.7.1 Airborne sound insulation index — calculation . 15
4.7.2 Airborne sound insulation index — testing . 15
4.7.3 Impact sound insulation — calculation . 15
4.7.4 Impact sound insulation — testing . 15
4.7.5 Sound absorption coefficient building elements . 15
4.7.6 Sound absorption coefficient traffic elements . 16
4.8 Other performances . 16
4.8.1 Mass of the element . 16
4.9 Release of dangerous substances — indoor air . 16
4.10 Release of dangerous substances — soil and ground water . 16
4.11 Environmental sustainability . 18
4.11.1 Reference service life . 18
4.11.2 Life cycle assessment environmental characteristics . 18
4.11.3 Resource use environmental characteristics . 18
4.11.4 Waste environmental characteristics . 19
4.11.5 Output flows environmental characteristics . 19
4.11.6 Biogenic carbon content environmental characteristics . 20
4.12 Documents attached to the declaration of performances. 20
4.12.1 General . 20
4.12.2 Off-the-shelf products . 20
4.12.3 Custom made products . 20
4.12.4 Set of drawings . 21
4.12.5 Calculations . 21
5 Testing, assessment and sampling methods . 21
5.1 Lightweight concrete with an open structure . 21
5.1.1 Determination of the characteristic strength . 21
5.1.2 Characteristic compressive strength lightweight concrete with an open structure . 22
5.1.3 Dry density lightweight concrete with an open structure . 24
5.1.4 Modulus of elasticity lightweight concrete with an open structure — testing . 24
5.1.5 Modulus of elasticity lightweight concrete with an open structure — calculation . 24
5.1.6 Drying shrinkage lightweight concrete with an open structure — testing . 24
5.1.7 Drying shrinkage lightweight concrete with an open structure — tabulated values . 25
5.1.8 Creep lightweight concrete with an open structure — testing . 25
5.1.9 Freeze–thaw resistance of concrete. 25
5.1.10 Corrosion protection . 25
5.2 Reinforcing steel . 25
5.2.1 Elongation at maximum load — reinforcing steel . 25
5.2.2 Elongation after fracture — reinforcing steel . 26
5.2.3 Stress ratio — reinforcing steel . 26
5.2.4 Tensile yield strength — reinforcing steel . 26
5.2.5 Ultimate tensile strength — reinforcing steel . 26
5.3 Mechanical performance . 26
5.3.1 General . 26
5.3.2 Mechanical strength — testing — lightweight concrete with an open structure
longitudinal load . 26
5.3.3 Mechanical strength — testing — rigidity of joints — lightweight concrete with an
open structure in-plane shear . 26
5.3.4 Mechanical strength — testing — rigidity of joints — lightweight concrete with an
open structure out-of-plane shear . 26
5.4 Fire performance . 26
5.4.1 Reaction to fire — class declaration . 26
5.4.2 Resistance to fire — class declaration — testing . 27
5.5 Thermal performance . 27
5.5.1 Thermal conductivity — testing . 27
5.5.2 Thermal conductivity — tabulated values . 27
5.6 Water performance . 28
5.6.1 Water vapour permeability — resistance factor -testing. 28
5.6.2 Water vapour permeability — resistance factor- tabulated values . 28
5.7 Acoustic performance . 28
5.7.1 Airborne sound insulation index — calculation . 28
5.7.2 Airborne sound insulation index — testing . 28
5.7.3 Impact sound insulation — calculation . 29
5.7.4 Impact sound insulation — testing . 29
5.7.5 Sound absorption coefficient building elements . 29
5.7.6 Sound absorption coefficient traffic elements . 29
5.8 Other performances . 29
5.8.1 Mass of element . 29
5.9 Release of dangerous substances — indoor air . 29
5.10 Release of dangerous substances — soil and ground water . 30
5.11 Environmental sustainability . 30
5.11.1 Reference service life . 30
5.11.2 Life cycle assessment environmental characteristics . 31
5.11.3 Resource use environmental characteristics . 31
5.11.4 Waste environmental characteristics . 31
5.11.5 Output flows environmental characteristics . 31
5.11.6 Biogenic carbon environmental characteristics . 31
5.12 Performances in attached documentation of the product . 32
5.12.1 General. 32
5.12.2 Off-the-shelf products . 32
5.12.3 Custom-made products . 32
6 Assessment and verification of constancy of performance — AVCP . 33
6.1 General. 33
6.2 Assessment of performance . 33
6.2.1 General. 33
6.2.2 Test samples, testing, and assessment criteria . 34
6.3 Verification of constancy of performance . 40
6.3.1 Factory production control (FPC) . 40
6.3.2 Initial inspection of factory and of FPC . 44
6.3.3 Initial inspection of the factory to validate environmental sustainability company
specific data . 45
6.3.4 Continuous surveillance of FPC . 46
6.3.5 Environmental sustainability assessment validation . 46
Annex ZA (informative) Relationship of this European Standard with Regulation (EU)
No.305/2011 . 47
Bibliography . 78
European foreword
This document (EN 1520:2026) has been prepared by Technical Committee CEN/TC 177 “Prefabricated
reinforced elements of autoclaved aerated concrete or lightweight aggregate concrete with open
structure”, 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 January 2027, and conflicting national standards shall
be withdrawn at the latest by April 2028.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1520:2011.
— the references to EN 206 have been replaced with the corresponding technical content,
— Annex ZA considering the standardization request addressed to CEN by the European Commission
has been updated.
— the text has been adjusted to the standardization request to the European Committee for
Standardization as regards precast concrete products in support of Regulation (EU) No 305/2011;
— terms and definitions have been updated;
— the order of clauses has been changed;
— normative references have been updated, adjusted and dated;
— properties and requirements of elements have been adapted, e.g. acoustic properties, thermal
resistance.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document covers, regardless of if manufactured in factories or in temporary plants on site under the
same conditions, precast concrete elements made of lightweight concrete with an open structure, and
with a dry density between 400 and 2000 kg/m , intended to be used as structural element:
— solid, hollow core and multilayer load-bearing wall elements;
— retaining wall elements, excluding retaining walls intended to retain tanks or reservoirs of liquids
and diaphragm walls (concrete sheet piling);
— solid, hollow core and multilayer roof elements, excluding ribbed floor elements and floor slabs
elements;
— solid, hollow core and multilayer floor elements excluding floor elements with the intended use to
carry traffic loads;
— solid and hollow core beams;
— solid piers.
This document covers, regardless of if manufactured in factories or in temporary plants on site under the
same conditions, precast concrete elements made of lightweight concrete with an open structure, and
with a dry density between 400 and 2000 kg/m , intended for not to be used as structural use:
— solid, hollow core and multilayer non-loadbearing wall elements;
— cladding elements;
— rectangular cross-section box culverts;
— components for noise barriers.
NOTE In addition to their loadbearing and encasing function, elements can also be used to provide fire
resistance, sound insulation and thermal insulation.
Recycled lightweight concrete with an open structure (other than closed-loop recycling during
production) is covered by this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes the requirements 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.
CEN/TS 12390-9:2016, Testing hardened concrete - Part 9: Freeze-thaw resistance with de-icing salts -
Scaling
EN 206-1:2026, Concrete - Specification, performance, production and conformity - Part 1: Performance,
requirements, factory production control and assessment criteria for individual values
EN 990:2002, Test methods for verification of corrosion protection of reinforcement in autoclaved aerated
concrete and lightweight aggregate concrete with open structure
EN 991:1995, Determination of the dimension of prefabricated reinforced components made of autoclaved
aerated concrete or lightweight aggregate concrete with open structure
EN 992:1995, Determination of the dry density of lightweight aggregate concrete with open structure
EN 1352:1996, Determination of static modulus of elasticity under compression of autoclaved aerated
concrete or lightweight aggregate concrete with open structure
EN 1354:2005, Determination of compressive strength of lightweight aggregate concrete with open
structure
EN 1355:1996, Determination of creep strains under compression of autoclaved aerated concrete or
lightweight aggregate concrete with open structure
EN 1364-1:2015, Fire resistance tests for non-loadbearing elements - Part 1: Walls
EN 1365-1:2012, Fire resistance tests for loadbearing elements — Part 1: Walls
EN 1365-2:2014, Fire resistance tests for loadbearing elements - Part 2: Floors and roofs
EN 1365-3:1999, Fire resistance tests for loadbearing elements - Part 3: Beams
EN 1365-4:1999, Fire resistance tests for loadbearing elements - Part 4: Columns
EN 1739:2007, Determination of shear strength for in-plane forces of joints between prefabricated
components of autoclaved aerated concrete or lightweight aggregate concrete with open structure
EN 1740:1998, Performance test for prefabricated reinforced components made of autoclaved aerated
concrete or lightweight aggregate concrete with open structure under predominantly longitudinal load
(vertical components)
EN 1741:1998, Determination of shear strength for out-of-plane forces of joints between prefabricated
components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure
EN 1745:2020, Masonry and masonry products - Methods for determining thermal properties
EN 1793-1:2025, Road traffic noise reducing devices - Test method for determining the acoustic
performance - Part 1: Intrinsic characteristics - Sound absorption under diffuse sound field conditions
EN 12664:2001, Thermal performance of building materials and products - Determination of thermal
resistance by means of guarded hot plate and heat flow meter methods - Dry and moist products of medium
and low thermal resistance
EN 13501-1:2018, Fire classification of construction products and building elements - Part 1: Classification
using data from reaction to fire tests
EN 13501-2:2023, Fire classification of construction products and building elements - Part 2: Classification
using data from fire resistance and/or smoke control tests, excluding ventilation services
EN 13823:2020+A1:2022, Reaction to fire tests for building products - Building products excluding
floorings exposed to the thermal attack by a single burning item
EN 15804:2012+A2:2019, Sustainability of construction works - Environmental product declarations - Core
rules for the product category of construction products
As impacted by EN 1365-1:2012/AC:2013.
EN 16516:2017+A1:2020, Construction products: Assessment of release of dangerous substances -
Determination of emissions into indoor air
EN 16637-1:2023, Construction products: Assessment of release of dangerous substances - Part 1: Guidance
for the determination of leaching tests and additional testing steps
EN 16637-2:2023, Construction products: Assessment of release of dangerous substances - Part 2:
Horizontal dynamic surface leaching test
EN 18185:2026, Sustainability of construction works - Environmental product declarations - Product
Category Rules for precast lightweight concrete with an open structure and precast autoclaved aerated
concrete
EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
EN ISO 717-1:2020, Acoustics - Rating of sound insulation in buildings and of building elements - Part 1:
Airborne sound insulation (ISO 717-1:2020)
EN ISO 717-2:2020, Acoustics - Rating of sound insulation in buildings and of building elements - Part 2:
Impact sound insulation (ISO 717-2:2020)
EN ISO 1182:2020, Reaction to fire tests for products - Non-combustibility test (ISO 1182:2020)
EN ISO 1716:2018, Reaction to fire tests for products - Determination of the gross heat of combustion
(calorific value) (ISO 1716:2018)
EN ISO 10140-2:2021, Acoustics - Laboratory measurement of sound insulation of building elements - Part
2: Measurement of airborne sound insulation (ISO 10140-2:2021)
EN ISO 10140-3:2021, Acoustics - Laboratory measurement of sound insulation of building elements - Part
3: Measurement of impact sound insulation (ISO 10140-3:2021)
EN ISO 10456:2007, Building materials and products — Hygrothermal properties — Tabulated design
values and procedures for determining declared and design thermal values (ISO 10456:2007+ Cor. 1:2009)
EN ISO 11925-2:2026, Reaction to fire tests - Ignitability of products subjected to direct impingement of
flame - Part 2: Single-flame source test (ISO 11925-2:2026)
EN ISO 12354-1:2017, Building acoustics - Estimation of acoustic performance of buildings from the
performance of elements - Part 1: Airborne sound insulation between rooms (ISO 12354-1:2017)
EN ISO 12354-2:2017, Building acoustics - Estimation of acoustic performance of buildings from the
performance of elements - Part 2: Impact sound insulation between rooms (ISO 12354-2:2017)
EN 12504-1:2019, Testing concrete in structures - Part 1: Cored specimens - Taking, examining and testing
in compression
EN ISO 12572:2016, Hygrothermal performance of building materials and products — Determination of
water vapour transmission properties (ISO 12572:2016)
As impacted by EN ISO 10456:2007/AC:2009.
As impacted by EN ISO 12572:2016/A1:2024.
EN ISO 15630-1:2019, Steel for the reinforcement and prestressing of concrete - Test methods - Part 1:
Reinforcing bars, rods and wire (ISO 15630-1:2019)
EN ISO 15630-2:2019, Steel for the reinforcement and prestressing of concrete - Test methods - Part 2:
Welded fabric and lattice girders (ISO 15630-2:2019)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 206-1:2026 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1.1
product family
group of products produced by one manufacturer for which the assessment results for one or more
characteristics from any one product within the range are valid for all other products within this range
3.1.2
lightweight aggregate
LWA
3 3
aggregate of mineral origin having a particle density not exceeding 2 000 kg/m (2,00 Mg/m ) or a loose
3 3
bulk density not exceeding 1 200 kg/m (1,20 Mg/m )
[SOURCE: EN 13055-1:2002, 3.2]
3.1.3
lightweight concrete with an open structure
LAC
lightweight concrete with an open or porous structure having a dry density between 400 and
2 000 kg/m and made with lightweight aggregates (LWA)
3.1.4
recycled lightweight concrete
material produced from crushed construction and demolition waste originating from lightweight
concrete with an open or porous structure elements
3.1.5
concrete
normal-weight concrete with a closed structure having a dry density between 2000 and 2 600 kg/m
3.1.6
loadbearing element
element designed to contribute to the mechanical resistance and stability of the works
Note 1 to entry: Elements exposed mainly to wind loads or acting as part of fire-resisting walls are considered to
be loadbearing.
3.1.7
non-loadbearing element
element that mainly supports its own weight and does not contribute to the stability of the work
3.1.8
reinforced element
element with a reinforcement used for both structural and non-structural purposes
3.2 Symbols
3.2.1 General symbols
A area
E modulus of elasticity
f strength
k coefficient, factor
3.2.2 Subscripts
c concrete parameter, compression
dry dry state
k characteristic value
m mean
3.2.3 Symbols used in this document
A elongation at maximum load — reinforcing steel
gt
A total elongation at fracture — reinforcing steel
t
Ecm mean value of the modulus of elasticity of LAC
f characteristic compressive strength of LAC
ck
f required minimum compressive strength of LAC
cmin
f required minimum compressive strength of a test set with n ≥ 6 test specimens
c,n
f required minimum compressive strength of each test set of three consecutive test specimens
c,3
f characteristic value of strength parameters
k
f required minimum strength
min
f mean value of n strength results
m,n
K statistical coefficient for determination of characteristic strength (λ is used in EN 206-1)
n
n number of test specimens in a sample, number of test results
Re yield strength, MPa
R Upper yield strength, MPa
eH
R yield strength at 0,2 % plastic elongation, MPa
p0,2
R tensile strength, MPa
m
s standard deviation of n test results
n
η coefficient according to Formula (2)
λ thermal conductivity
λ thermal conductivity in the dry state, determined at a mean test temperature of 10 °C
10dry
μ moisture content, related to mass
m
ρ dry density of LAC
3.3 Abbreviations
FPC factory production control
LAC lightweight concrete with an open structure
RH relative humidity
4 Characteristics
4.1 Concrete
4.1.1 Compressive strength lightweight concrete with an open structure
The compressive strength of lightweight concrete with an open structure is an indication of the
loadbearing capacity of an element.
When assessing compressive strength, this shall be determined in accordance with 5.1.2. The
performance of compressive strength shall be expressed as a class.
4.1.2 Dry density lightweight concrete with an open structure
The dry density lightweight concrete with an open structure serves as a reference for the calculation of
some mechanical values and thermal insulation properties of elements.
When assessing dry density, this shall be determined in accordance with 5.1.3, the performance of density
shall be expressed as a class.
4.1.3 Modulus of elasticity lightweight concrete with an open structure - testing
When assessing the modulus of elasticity using the test methods given in 5.1.4, the modulus of elasticity
shall be expressed in MPa.
4.1.4 Modulus of elasticity lightweight concrete with an open structure - calculation
When assessing the modulus of elasticity using the calculation method given in 5.1.5, the modulus of
elasticity shall be expressed in MPa.
4.1.5 Drying shrinkage lightweight concrete with an open structure- testing
When assessing drying shrinkage, this shall be determined in accordance with 5.1.6. The performance of
drying shrinkage shall be expressed in mm/m, rounded to the nearest 0,01.
4.1.6 Drying shrinkage lightweight concrete with an open structure – tabulated values
When using a tabulated value for drying shrinkage, the value given in 5.1.7 shall be used. The performance
of drying shrinkage shall be expressed in mm/m, rounded to the nearest 0,01 together with the relevant
relative humidity of the environment.
4.1.7 Creep lightweight concrete with an open structure - testing
Creep describes the deformation of lightweight concrete with an open structure under longer lasting
stress-induced loading.
When assessing creep, this shall be determined in accordance with 5.1.8. The performance of creep shall
be expressed in mm/m.
4.1.8 Freeze–thaw resistance of concrete
When assessing the freeze–thaw resistance of concrete, this shall be determined in accordance with 5.1.9
and expressed in kg/m . The freezing agent used shall be specified.
4.1.9 Corrosion protection
When assessing the corrosion protection of concrete, this shall be determined in accordance with 5.1.10.
The type of corrosion protection (galvanized, stainless or coated steel) used shall be provided. The type
of corrosion protection and the % of corroded surface area shall be provided. The performance of the
corrosion protection shall be expressed as percentage.
4.2 Reinforcing steel
4.2.1 Elongation at maximum load — reinforcing steel
When assessing the elongation at maximum load of reinforcing steel (A ), this shall be determined in
gt
accordance with 5.2.1. The performance of elongation at maximum load of reinforcing steel shall be
expressed as a ratio, rounded to the nearest 0,1.
4.2.2 Elongation after fracture — reinforcing steel
When assessing the elongation after fracture of reinforcing steel (A ), this shall be determined in
r
accordance with 5.2.2. The performance of elongation after fracture of reinforcing steel shall be
expressed as a ratio, rounded to the nearest 0,1.
4.2.3 Stress ratio — reinforcing steel
When assessing the stress ratio of reinforcing steel (R /R ), this shall be determined in accordance with
m e
5.2.3. The performance of stress ratio of reinforcing steel shall be expressed as a ratio, rounded to the
nearest 0,01.
4.2.4 Tensile yield strength — reinforcing steel
When assessing the tensile yield strength of reinforcing steel (R ), this shall be determined in accordance
e
with 5.2.4. The performance of tensile yield strength of reinforcing steel shall be expressed in MPa,
rounded to the nearest integer.
4.2.5 Ultimate tensile strength — reinforcing steel
When assessing the ultimate tensile strength of reinforcing steel (R ), this shall be determined in
m
accordance with 5.2.5. The performance of ultimate tensile strength of reinforcing steel shall be
expressed in MPa, rounded to the nearest integer.
4.3 Mechanical performance
4.3.1 Mechanical strength — testing — lightweight concrete with an open structure —
longitudinal load
When assessing the mechanical strength of elements under longitudinal load, this shall be determined in
accordance with 5.3.2. The performance of mechanical strength of elements under longitudinal load shall
be expressed in MN
The calculation and corresponding test method shall be part of the documentation provided with the
declaration in accordance with 4.12.
4.3.2 Mechanical strength — testing — lightweight concrete with an open structure — rigidity of
joints–in-plane-shear
When using the rigidity of joints in design the mechanical strength of joints under in-plane-shear shall be
determined in accordance with 5.3.3. The performance mechanical strength of joints under in-plane-
shear shall be expressed in MPa.
The calculation and corresponding test method shall be part of the documentation provided with the
declaration in accordance with 4.12.
4.3.3 Mechanical strength — testing — lightweight concrete with an open structure — rigidity of
joints — out-of-plane-shear
When using the rigidity of joints in design the mechanical strength of joints under out-of-plane-shear
shall be determined in accordance with 5.3.4. The performance mechanical strength of joints under out-
of-plane-shear shall be expressed in MPa.
The calculation and corresponding test method shall be part of the documentation provided with the
declaration in accordance with 4.12.
4.4 Fire performance
4.4.1 Reaction to fire
4.4.1.1 Classification by testing
The reaction to fire indicates the response of a lightweight concrete with an open structure element in
contributing by its own decomposition to a fire to which it is exposed, under specified conditions. When
tested in accordance with the test method given in 5.4.1, relevant for the claimed class, the test results
are expressed as a class according to the classification published in the Official Journal of the European
Union on this specific matter.
NOTE The applicable document at the time this document was drafted is Commission Delegated Regulation
(EU) 2016/364 of 1 July 2015. https://eur-lex.europa.eu/eli/reg_del/2016/364
4.4.1.2 Classification without further testing (WFT)
Whether products covered by this document fulfil the conditions, under which they have demonstrated
of having a stable reaction to fire performance in a given reaction to fire class, based on testing to the
SIST
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