oSIST prEN 1090-4:2025
(Main)Execution of steel structures and aluminium structures - Part 4: Technical requirements for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall applications
- Abstract
This document specifies requirements for the execution, i.e. the manufacture and the installation, of cold-formed structural steel members and profiled sheeting and cold-formed structures for roof, ceiling, floor, wall and cladding applications.
This document applies to structures designed in accordance with the EN 1993 series.
This document applies to structural members and profiled sheeting designed in accordance with EN 1993-1-3 and EN 1993-1-4.
This document can be used for structures designed in accordance with other design rules provided that conditions for execution comply with them and any necessary additional requirements are specified.
This document also specifies requirements for the execution i.e. the manufacture and the installation of structures made from cold-formed profiled sheeting for roof, ceiling, floor and wall applications under predominately static loading or seismic loading conditions and their documentation.
This document covers structural profiled sheeting of Structural Class I and II and structural profiled sheeting in Structural Class III in accordance with EN 1993-1-3 used in structures.
NOTE 1 In National Annexes of EN 1993-1-3 specifications can be given regarding the use of the Structural Classes.
This document covers structural members of all structural classes in accordance with EN 1993-1-3.
Structural profiled sheeting is understood here to be:
- profiled sheet, such as trapezoidal, sinusoidal or liner trays (Figure 1).
Structural members are understood here to be:
- members (linear profiled cross sections) that are produced by cold forming (Figure 2).
This document also covers:
- not welded built-up sections (Figure 2d);
- cold-formed closed and hollow sections including the welding of the longitudinal seam (Figure 2b and Figure 2c), not covered by EN 10219-1;
- perforated, punctured and micro profiled sheeting and members.
The welding of built-up sections are not covered. The welding provisions are given in EN 1090-2.
This document also covers spacer constructions between the outer and inner or upper and lower skins for roofs, walls and ceilings made from cold-formed profiled sheeting and the connections and attachments of the afore mentioned elements as long as all has a structural purpose.
This document covers steel profiled sheeting for composite floors, e.g. during installation and in stage of pouring concrete.
This document also covers the deconstruction of structures made from cold-formed profiled sheeting and structural members for roof, ceiling, floor and wall applications.
Composite structural members where the interaction between dissimilar materials are an integral part of the structural behaviour such as sandwich panels and composite floors are not covered by this document.
This document does not cover the necessary analyses and detailing and execution rules for thermal insulation, moisture protection, noise control and fire protection.
This document does not cover regulations of roof cladding and wall cladding, produced by traditional plumber methods or tinsmith methods.
This document does not cover detailed requirements for water tightness or air permeability resistance and thermal aspects of profiled sheeting.
NOTE 2 The structures covered in this document can be for example:
- single- or multi-skin roofs, whereby the load-bearing structure (lower skin) or the actual roof covering (upper skin) or both consist of cold-formed structural members and profiled sheeting;
- single- or multi-skin walls whereby the load-bearing structure (inner skin), the actual cladding (outer skin) or both consist of cold-formed structural members and profiled sheeting, or
- trusses from cold-formed members.
NOTE 3 Structures can consist of an assembly of structural members and profiled sheeting made of steel in accordance with this document and of aluminium in accordance with EN 1090-5.
Figure 1 - Examples of profiled sheeting
Figure 2 - Examples of members
- Status
- Not Published
- Public Enquiry End Date
- 27-Mar-2025
- Technical Committee
- KON - Structures
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 29-Jan-2025
- Due Date
- 18-Jun-2025
- Completion Date
- 01-Aug-2025
oSIST prEN 1090-4:2025 is a CEN draft European Standard for the execution of steel structures and aluminium structures, focused on cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall applications. It specifies requirements for manufacture, installation, documentation, tolerances, fastening, welding, surface protection, inspection and deconstruction, mainly for manufacturers, installers, designers and quality staff working with these products.
What does oSIST prEN 1090-4:2025 specify?
oSIST prEN 1090-4:2025 specifies the execution of cold-formed structural steel members, profiled sheeting and cold-formed structures used in roof, ceiling, floor, wall and cladding applications. It is written for structures designed to the EN 1993 series, especially EN 1993-1-3 and EN 1993-1-4, and it can also be used with other design rules when their execution conditions are met.
The scope includes manufacture and installation under predominantly static or seismic loading, together with the related documentation. It also covers deconstruction of these structures, so the standard supports the full life cycle on site, not only initial fabrication.
The document does not cover composite structural members where dissimilar materials are part of the structural behaviour, such as sandwich panels and composite floors. It also leaves out thermal insulation, moisture protection, noise control, fire protection detailing, traditional plumber or tinsmith cladding work, and detailed water tightness, air permeability and thermal requirements for profiled sheeting.
The standard is organized into clauses on specification and documentation, products, manufacturing, welding, mechanical fastening, installation, surface protection, geometrical tolerances, inspection and testing, and deconstruction. Its annexes provide design, tolerance, corrosion-protection and record-keeping details.
| Annex | What it covers |
|---|---|
| Annex A | Basic requirements for profiled sheeting, including support conditions, edges, building physics and roof drainage |
| Annex B | Additional design requirements for profiled sheeting, including serviceability, support widths, cantilevers and effective load width |
| Annex C | Installation records |
| Annex D | Geometrical tolerances for profiled sheeting, members and punched holes |
| Annex E | Corrosion protection by metallic coating, with or without organic coatings, and the related suitability tests |
| Annex F | Additional information that shall be specified when the standard calls for it |
What are the key requirements of oSIST prEN 1090-4:2025?
oSIST prEN 1090-4:2025 ties execution to a controlled specification, traceable materials, suitable fabrication methods and documented inspection. In practice, that means the manufacturer and installer must define how the work will be done, prove what was installed, and control nonconforming products before they reach the structure.
Specification, records and traceability
Clause 4 requires an execution specification from the manufacturer and an installation specification from the installer. It also requires layout drawings, defined geometrical tolerances, installation quality documentation and installation records, with a completion statement signed at the end of the work.
For the reader, this means the job should not start without agreed instructions, drawing information and acceptance criteria. The same clause requires traceability of cold-formed steel members and profiled sheeting from material purchase through production and installation, so batch identification and records matter on site and in the factory.
Products, materials and identification
Clause 5 requires materials to be suitable for cold forming and to comply with the material provisions in the standard. For steel products, inspection documents are part of the control system, and products need identification and labelling that support traceability and comparison with the specified properties.
This matters because the standard treats materials without the required documentation as nonconforming until compliance is demonstrated. Clause 5 also states that accessories needed for function, such as trims, sealant strips, fillers and flashings, must meet the same durability, corrosion protection and reaction-to-fire expectations unless otherwise specified.
Manufacturing and welding
Clause 6 requires cold forming by roll forming or press braking and forbids hammering. It also requires that bends do not show visible cracking and that stainless steel forming equipment be cleaned when the same equipment is used for other steels.
For a fabricator, this means process control is part of product quality, not just final inspection. Clause 7 adds welding rules: general welding provisions come from EN 1090-2, while the longitudinal seam of cold-formed closed and hollow sections needs a welding procedure specification based on a pre-production test, with specified inspection and destructive testing before production and during production.
Mechanical fastening
Clause 8 covers screws, blind rivets and cartridge fired pins for shop and site fastening. Fasteners must follow the installation specification and the fastener manufacturer’s instructions, and procedure tests may be used to prove that the connection can be made correctly in site conditions.
The practical message is that fastening is not only a product choice but also a workmanship issue. The standard requires attention to screw length, torque or depth control, washer compression, rivet length, pin selection and the spacing and edge distances for sidelaps and attachments, and it requires swarf and broken mandrels to be removed to avoid later corrosion.
Installation, inspection and acceptance
Clause 9 sets the site rules. Installation only starts when site conditions are suitable, trained and experienced personnel are available, the preceding works have been checked, tools are correct, and safety devices and fall protection are in place.
This clause also governs storage, unloading, lifting, laying, direction of lay, maintaining cover width and cleaning after installation. Damaged members or sheeting may only stay in place if load-bearing capacity, serviceability and durability are still adequate, and diaphragms have to be identified and communicated clearly because later alterations can affect the stability of the whole building.
Clause 12 requires inspection and testing to follow a predetermined plan, with documented procedures and correction of nonconforming products. Clause 13 extends the same safety mindset to deconstruction, which has to be planned, controlled and documented.
Surface protection, tolerances and special cases
Clause 10 and Annex E govern corrosion protection, including metallic coatings, organic coatings and the suitability checks for corrosivity categories. Clause 11 and Annex D set essential and functional geometrical tolerances, which helps ensure both structural performance and fit-up on site.
Annex A and Annex B add design conditions for profiled sheeting, including support widths, drainage, water ponding, walkability and cantilevers. Annex A also links roof detailing to roof pitch and overlapping, which matters for avoiding water ingress and for deciding where special sealing measures are needed.
What terms does oSIST prEN 1090-4:2025 define?
- component I - the part of a connection, usually the profiled sheeting, that faces the head of the fastener or the swage head in the case of blind rivets.
- component II - the second part of a connection, usually the supporting member.
- decking - load-bearing profiled sheeting intended to support insulation and an outer skin.
- fastening - the fastener, the fastening process and the final connected components taken together.
- layout drawing - a drawing showing the position of structural components and installation details.
- liner tray - a profiled sheet with a large lipped edge stiffener that can interlock with adjacent trays to form a ribbed plane able to support a parallel plane of profiled sheeting.
- member - a linear profiled cross section, with cross-sectional dimensions much smaller than its length.
- essential tolerance - a geometrical limit needed to satisfy the design assumptions for mechanical resistance and stability.
- functional tolerance - a geometrical tolerance needed for functions such as appearance or fit-up.
- structural cold-formed component - a load-bearing element made from steel sheet by cold rolling or press braking.
Who uses oSIST prEN 1090-4:2025?
oSIST prEN 1090-4:2025 is used by manufacturers of cold-formed structural steel members and profiled sheeting, by installers and erectors of roof, ceiling, floor and wall systems, and by designers who use the EN 1993 series. It is also used by quality managers, inspectors and buyers who need to define execution requirements, traceability, documentation and acceptance criteria.
The standard is relevant in steel building envelopes, cladding systems, single-skin and multi-skin roofs and walls, trusses made from cold-formed members, and composite floor work during installation and concrete pouring. It also matters to coating suppliers, fastener suppliers and deconstruction contractors because the standard covers corrosion protection, fastening systems and controlled dismantling.
What changed in oSIST prEN 1090-4:2025 from the previous edition?
oSIST prEN 1090-4:2025 supersedes EN 1090-4:2018. The European foreword states that the document has undergone a fundamental revision and has been adapted to the current state of science and technology.
Which standards are used with oSIST prEN 1090-4:2025?
| Standard or series | What it contributes |
|---|---|
| EN 1090-1 | Conformity assessment requirements for structural elements, and the referenced provisions for reaction to fire, resistance to fire and release of dangerous substances |
| EN 1090-2 | Technical requirements for steel structures, including general welding provisions, site work and fastening cases not covered here |
| EN 1090-5 | Technical requirements for cold-formed structural aluminium elements and structures where aluminium is part of the assembly |
| EN 1990 | Basis of structural and geotechnical design |
| EN 1991 series | Actions on structures, including loads during execution, accidental and thermal actions, and roof drainage context |
| EN 1993-1-3 and EN 1993-1-4 | Design rules for cold-formed members and sheeting, and supplementary rules for stainless steels |
| EN 1993-1-5 and EN 1993-1-8 | Plated structural elements and joints |
| EN 1994-1-1 and EN 1995-1-1 | Composite steel-concrete and timber support situations |
| EN 1998-1 | Seismic actions and building design in earthquake resistance |
| EN 10204 | Inspection documents for material traceability |
| EN 10346, EN 10143, EN 10152, EN 10162, EN 10169, EN 508-3 | Base material specifications, coating systems and dimensional tolerances for the steel and stainless products used |
| EN 14782 and EN 14783 | Product specifications for metal sheet and strip used in roofing, cladding and lining |
| CEN/TS 1187 and EN 13501-5 | External fire exposure tests and the related roof fire classification |
| EN ISO 15613, EN ISO 5173, EN ISO 8492, EN ISO 8493, EN ISO 4136, EN ISO 17639 | Welding procedure qualification and test methods for longitudinal seam welding |
| EN ISO 12944 series, EN ISO 1461, EN ISO 2081, EN ISO 9227, EN ISO 2808, EN ISO 2409, EN ISO 6270-1, EN 10169 | Corrosion protection systems and the test methods used to check their suitability |
| EN 62305-3 and EN 62561-1 | Lightning protection requirements and connection components |
| EN ISO 717-1, EN ISO 11654, EN ISO 354, EN ISO 10140 | Acoustic ratings and test methods where building acoustics are relevant |
| EN 12056 series | Roof drainage guidance referenced in Annex A |
What does the oSIST prEN 1090-4:2025 document contain?
oSIST prEN 1090-4:2025 contains numbered clauses covering specification, products, manufacturing, welding, mechanical fastening, installation, surface protection, geometrical tolerances, inspection, testing, correction and deconstruction. It also contains normative annexes with drawings, design checks, tolerance tables, corrosion-protection methods and installation record guidance.
The document uses figures for profiled sheeting forms, member forms, double layers, support details, cantilevers and a diaphragm warning sign. Annex D provides the dimensional deviation tables for profiled sheeting, members and punched holes, while Annex E sets out coating systems, corrosivity categories and the test matrix for checking corrosion-protection suitability.
Several clauses refer to work instructions, test plans and documented procedures rather than reproducing all execution details in the body text. In practice, the standard is meant to be used as a control document for fabrication, site installation, inspection and acceptance, not as a design code for the structural analysis itself.
Relations
- Effective Date
- 19-Jan-2023
- Effective Date
- 18-Jan-2023
- Effective Date
- 14-Sep-2022
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Frequently Asked Questions
oSIST prEN 1090-4:2025 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Execution of steel structures and aluminium structures - Part 4: Technical requirements for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall applications". This standard covers: This document specifies requirements for the execution, i.e. the manufacture and the installation, of cold-formed structural steel members and profiled sheeting and cold-formed structures for roof, ceiling, floor, wall and cladding applications. This document applies to structures designed in accordance with the EN 1993 series. This document applies to structural members and profiled sheeting designed in accordance with EN 1993-1-3 and EN 1993-1-4. This document can be used for structures designed in accordance with other design rules provided that conditions for execution comply with them and any necessary additional requirements are specified. This document also specifies requirements for the execution i.e. the manufacture and the installation of structures made from cold-formed profiled sheeting for roof, ceiling, floor and wall applications under predominately static loading or seismic loading conditions and their documentation. This document covers structural profiled sheeting of Structural Class I and II and structural profiled sheeting in Structural Class III in accordance with EN 1993-1-3 used in structures. NOTE 1 In National Annexes of EN 1993-1-3 specifications can be given regarding the use of the Structural Classes. This document covers structural members of all structural classes in accordance with EN 1993-1-3. Structural profiled sheeting is understood here to be: - profiled sheet, such as trapezoidal, sinusoidal or liner trays (Figure 1). Structural members are understood here to be: - members (linear profiled cross sections) that are produced by cold forming (Figure 2). This document also covers: - not welded built-up sections (Figure 2d); - cold-formed closed and hollow sections including the welding of the longitudinal seam (Figure 2b and Figure 2c), not covered by EN 10219-1; - perforated, punctured and micro profiled sheeting and members. The welding of built-up sections are not covered. The welding provisions are given in EN 1090-2. This document also covers spacer constructions between the outer and inner or upper and lower skins for roofs, walls and ceilings made from cold-formed profiled sheeting and the connections and attachments of the afore mentioned elements as long as all has a structural purpose. This document covers steel profiled sheeting for composite floors, e.g. during installation and in stage of pouring concrete. This document also covers the deconstruction of structures made from cold-formed profiled sheeting and structural members for roof, ceiling, floor and wall applications. Composite structural members where the interaction between dissimilar materials are an integral part of the structural behaviour such as sandwich panels and composite floors are not covered by this document. This document does not cover the necessary analyses and detailing and execution rules for thermal insulation, moisture protection, noise control and fire protection. This document does not cover regulations of roof cladding and wall cladding, produced by traditional plumber methods or tinsmith methods. This document does not cover detailed requirements for water tightness or air permeability resistance and thermal aspects of profiled sheeting. NOTE 2 The structures covered in this document can be for example: - single- or multi-skin roofs, whereby the load-bearing structure (lower skin) or the actual roof covering (upper skin) or both consist of cold-formed structural members and profiled sheeting; - single- or multi-skin walls whereby the load-bearing structure (inner skin), the actual cladding (outer skin) or both consist of cold-formed structural members and profiled sheeting, or - trusses from cold-formed members. NOTE 3 Structures can consist of an assembly of structural members and profiled sheeting made of steel in accordance with this document and of aluminium in accordance with EN 1090-5. Figure 1 - Examples of profiled sheeting Figure 2 - Examples of members
This document specifies requirements for the execution, i.e. the manufacture and the installation, of cold-formed structural steel members and profiled sheeting and cold-formed structures for roof, ceiling, floor, wall and cladding applications. This document applies to structures designed in accordance with the EN 1993 series. This document applies to structural members and profiled sheeting designed in accordance with EN 1993-1-3 and EN 1993-1-4. This document can be used for structures designed in accordance with other design rules provided that conditions for execution comply with them and any necessary additional requirements are specified. This document also specifies requirements for the execution i.e. the manufacture and the installation of structures made from cold-formed profiled sheeting for roof, ceiling, floor and wall applications under predominately static loading or seismic loading conditions and their documentation. This document covers structural profiled sheeting of Structural Class I and II and structural profiled sheeting in Structural Class III in accordance with EN 1993-1-3 used in structures. NOTE 1 In National Annexes of EN 1993-1-3 specifications can be given regarding the use of the Structural Classes. This document covers structural members of all structural classes in accordance with EN 1993-1-3. Structural profiled sheeting is understood here to be: - profiled sheet, such as trapezoidal, sinusoidal or liner trays (Figure 1). Structural members are understood here to be: - members (linear profiled cross sections) that are produced by cold forming (Figure 2). This document also covers: - not welded built-up sections (Figure 2d); - cold-formed closed and hollow sections including the welding of the longitudinal seam (Figure 2b and Figure 2c), not covered by EN 10219-1; - perforated, punctured and micro profiled sheeting and members. The welding of built-up sections are not covered. The welding provisions are given in EN 1090-2. This document also covers spacer constructions between the outer and inner or upper and lower skins for roofs, walls and ceilings made from cold-formed profiled sheeting and the connections and attachments of the afore mentioned elements as long as all has a structural purpose. This document covers steel profiled sheeting for composite floors, e.g. during installation and in stage of pouring concrete. This document also covers the deconstruction of structures made from cold-formed profiled sheeting and structural members for roof, ceiling, floor and wall applications. Composite structural members where the interaction between dissimilar materials are an integral part of the structural behaviour such as sandwich panels and composite floors are not covered by this document. This document does not cover the necessary analyses and detailing and execution rules for thermal insulation, moisture protection, noise control and fire protection. This document does not cover regulations of roof cladding and wall cladding, produced by traditional plumber methods or tinsmith methods. This document does not cover detailed requirements for water tightness or air permeability resistance and thermal aspects of profiled sheeting. NOTE 2 The structures covered in this document can be for example: - single- or multi-skin roofs, whereby the load-bearing structure (lower skin) or the actual roof covering (upper skin) or both consist of cold-formed structural members and profiled sheeting; - single- or multi-skin walls whereby the load-bearing structure (inner skin), the actual cladding (outer skin) or both consist of cold-formed structural members and profiled sheeting, or - trusses from cold-formed members. NOTE 3 Structures can consist of an assembly of structural members and profiled sheeting made of steel in accordance with this document and of aluminium in accordance with EN 1090-5. Figure 1 - Examples of profiled sheeting Figure 2 - Examples of members
oSIST prEN 1090-4:2025 is classified under the following ICS (International Classification for Standards) categories: 91.010.30 - Technical aspects; 91.080.13 - Steel structures; 91.080.17 - Aluminium structures. The ICS classification helps identify the subject area and facilitates finding related standards.
oSIST prEN 1090-4:2025 has the following relationships with other standards: It is inter standard links to SIST EN 1090-4:2018, SIST EN 1090-4:2018, SIST EN 1090-4:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
oSIST prEN 1090-4:2025 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-marec-2025
Izvedba jeklenih in aluminijastih konstrukcij - 4. del: Tehnične zahteve za hladno
oblikovane konstrukcijske jeklene elemente in hladno oblikovane konstrukcijske
elemente za strešne, stropne, talne in stenske konstrukcije
Execution of steel structures and aluminium structures - Part 4: Technical requirements
for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor
and wall applications
Ausführung von Stahltragwerken und Aluminiumtragwerken - Teil 4: Technische
Anforderungen an tragende, kaltgeformte Bauelemente aus Stahl und tragende,
kaltgeformte Bauteile für Dach-, Decken-, Boden- und Wandanwendungen
Exécution des structures en acier et des structures en aluminium - Partie 4 : Exigences
techniques pour éléments et structures en acier formés à froid pour applications
structurales en toiture, couverture, plafond, paroi verticale et plancher
Ta slovenski standard je istoveten z: prEN 1090-4
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.13 Jeklene konstrukcije Steel structures
91.080.17 Aluminijaste konstrukcije Aluminium structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 1090-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2025
ICS 91.010.30; 91.080.13; 91.080.17 Will supersede EN 1090-4:2018
English Version
Execution of steel structures and aluminium structures -
Part 4: Technical requirements for cold-formed structural
steel elements and cold-formed structures for roof, ceiling,
floor and wall applications
Exécution des structures en acier et des structures en Ausführung von Stahltragwerken und
aluminium - Partie 4 : Exigences techniques pour Aluminiumtragwerken - Teil 4: Technische
éléments et structures en acier formés à froid pour Anforderungen an tragende, kaltgeformte Bauelemente
applications en toiture, plafond, paroi verticale et aus Stahl und tragende, kaltgeformte Bauteile für Dach-
plancher , Decken-, Boden- und Wandanwendungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 135.
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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1090-4:2025 E
worldwide for CEN national Members.
prEN 1090-4:2025 (E)
Contents Page
European foreword . 7
1 Scope . 8
2 Normative references . 10
3 Terms, definitions, symbols and abbreviations . 13
3.1 Terms and definitions . 13
3.2 Symbols and abbreviations . 15
4 Specifications and documentation . 17
4.1 Execution Specification . 17
4.1.1 General. 17
4.1.2 Execution specification of the manufacturer . 17
4.1.3 Installation specification of the installer . 17
4.1.4 Execution classes . 17
4.1.5 Structural classes . 18
4.1.6 Layout drawings . 18
4.1.7 Geometrical tolerances . 19
4.2 Installation quality documentation . 19
4.2.1 General. 19
4.2.2 Content of the installation quality documentation. 19
4.3 Installation documentation . 20
4.4 Detailed traceability documentation . 20
4.5 Safety of the installation works . 20
5 Products . 20
5.1 General. 20
5.2 Identification, inspection documents and traceability . 20
5.3 Materials . 21
5.4 Thickness tolerances . 23
5.5 Minimum nominal sheet thicknesses . 23
5.5.1 Profiled sheeting . 23
5.5.2 Structural members . 24
5.6 Geometrical tolerances . 24
5.7 Mechanical fasteners . 25
5.7.1 General. 25
5.7.2 Type of fasteners and materials . 25
5.8 Accessories . 26
5.9 Surface protection . 26
5.10 External fire performance for profiled sheeting as an outer layer of roofs . 26
5.11 Reaction to fire. 27
5.12 Resistance to fire . 27
5.13 Release of dangerous substances . 27
5.14 Lightning protection . 27
6 Manufacturing . 27
6.1 General. 27
6.2 Identification . 27
6.3 Cold forming . 28
prEN 1090-4:2025 (E)
6.4 Cutting. 28
6.4.1 General . 28
6.4.2 Shearing and nibbling . 28
6.4.3 Thermal cutting . 28
6.5 Holing . 28
6.5.1 General . 28
6.5.2 Execution of punching . 28
7 Welding . 29
7.1 General . 29
7.2 Welding of the longitudinal weld seam of cold-formed closed and hollow sections . 29
7.3 Welding at the construction site . 30
8 Mechanical fastening . 30
8.1 General . 30
8.2 Use of self-tapping and self-drilling screws . 31
8.3 Use of blind rivets . 31
8.4 Use of cartridge fired pins . 32
8.5 Attachment of cold-formed structural members and profiled sheeting to the supporting
member . 32
8.5.1 Types of connections and attachments. 32
8.5.2 Attachment of profiled sheets to the supporting member transverse to the direction of span
............................................................................................................................................................................. 32
8.5.3 Attachment of profiled sheeting to supports parallel to the direction of profiled sheeting’s
span. 34
8.5.4 Supporting member made of metal . 34
8.5.5 Supporting member made of timber or other wood-based materials . 34
8.5.6 Supporting member made of concrete or masonry . 34
8.6 Connecting profiled sheeting . 35
8.7 Edge distances and spacing of fasteners for profiled sheeting . 35
8.7.1 General . 35
8.7.2 Edge spacings of webs of trapezoidal profiled sheeting and liner tray profiles . 35
9 Installation . 36
9.1 General . 36
9.2 Site conditions . 36
9.3 Training/instruction of installation personnel . 36
9.4 Inspection of preceding works . 37
9.5 Layout drawing . 37
9.6 Tools required . 37
9.7 Safety on site. 37
9.8 Inspection of packaging and contents . 37
9.9 Storage . 37
9.10 Damaged structural members and profiled sheeting and connecting devices . 38
9.11 Unloading, lifting gear/slings/straps . 38
9.12 Laying . 39
9.13 Direction of lay . 39
9.14 Maintaining the cover width during installation . 39
9.15 Condition after installation (swarf from drilling, fouling of surface, protective film wrap)39
9.16 Inspection after installation . 39
9.17 Diaphragms . 39
9.18 Protection against lightning . 40
10 Surface protection . 40
10.1 Corrosion protection . 40
prEN 1090-4:2025 (E)
10.1.1 General. 40
10.1.2 Carbon steels . 41
10.1.3 Stainless steels . 41
10.1.4 Combination of metallic materials . 41
10.2 Cleaning and maintenance . 42
10.2.1 Organic coated products . 42
10.2.2 Metallic coated products . 42
10.2.3 Stainless steel . 42
11 Geometrical tolerances . 42
11.1 General. 42
11.2 Tolerance types . 43
11.3 Essential tolerances . 43
11.3.1 General. 43
11.3.2 Manufacturing tolerances . 43
11.3.3 Installation tolerances . 44
11.4 Functional tolerances . 44
12 Inspection, testing and correction . 44
12.1 General. 44
12.2 Structural members, profiled sheeting and fasteners . 44
12.2.1 General. 44
12.2.2 Non-conforming products . 44
12.3 Manufacturing: geometrical dimensions of manufactured structural members and profiled
sheeting . 44
12.3.1 General. 44
12.3.2 Profiled sheeting . 45
12.3.3 Members. 45
12.4 Inspection of the installed structure. 46
12.5 Inspection of fastening . 46
12.5.1 Self-tapping and self-drilling screws . 46
12.5.2 Blind rivets . 46
12.5.3 Cartridge fired pins . 46
12.5.4 Bolted Connections . 46
13 Deconstruction . 47
13.1 General. 47
13.2 Deconstruction process . 47
Annex A (normative) Basic requirements for profiled sheeting . 49
A.1 General. 49
A.2 Supporting members . 51
A.2.1 Materials . 51
A.2.2 Shear forces/fixed points . 52
A.3 Edges of laying area. 52
A.3.1 Longitudinal decking edge trims . 52
A.3.2 Weakening of the cross section . 53
A.3.3 Reinforcements and double layers . 53
A.3.4 Avoidance of ice damming . 54
A.4 Building physics requirements . 54
prEN 1090-4:2025 (E)
A.4.1 General . 54
A.4.2 Water permeability . 54
A.4.3 Thermal insulation . 55
A.4.4 Avoidance of condensation/moisture protection. 55
A.4.5 Airborne sound insulation (R ) . 55
w
A.4.6 Sound absorption (α ) . 56
w
A.4.7 Protection against lightning . 56
A.5 Roof drainage . 56
Annex B (normative) Additional design requirements for profiled sheeting . 58
B.1 General . 58
B.2 Serviceability . 58
B.3 Widths of supports . 58
B.4 Supports made of concrete or masonry . 59
B.5 Walkability . 61
B.5.1 Walkability during installation . 61
B.5.2 Walkability and access after installation . 61
B.6 Cantilevers . 61
B.7 Effective load width . 62
B.7.1 Effective load width for non-composite slabs under point or line loads . 62
B.7.2 Load dispersal by means of other structural members . 62
Annex C (normative) Installation records . 63
Annex D (normative) Geometrical tolerances . 64
D.1 General . 64
D.2 Essential and functional manufacturing tolerances – Cold-formed profiled sheeting . 64
D.3 Essential and functional manufacturing tolerances – Cold-formed members including
custom cold rolled closed and hollow sections. 70
D.3.1 Press braked or folded members. 70
D.3.2 Roll-formed members . 71
D.4 Essential manufacturing tolerances – Punched holes . 71
Annex E (normative) Corrosion protection by metallic coating with or without organic coatings72
E.1 Corrosion protection . 72
E.2 Suitability of corrosion protection . 76
E.2.1 Selection . 76
E.2.2 Examination of suitability (initial inspection) . 82
E.2.3 Monitoring. 84
E.2.4 Galvanic corrosion . 85
prEN 1090-4:2025 (E)
Annex F (normative) Additional information . 88
F.1 List of required additional information . 88
F.2 List of additional information if not otherwise specified . 89
Bibliography . 90
prEN 1090-4:2025 (E)
European foreword
This document (prEN 1090-4:2025) has been prepared by Technical Committee CEN/TC 135 “Execution
of steel structures and aluminium structures”, the secretariat of which is held by SN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1090-4:2018.
This document includes the following significant technical changes with respect to EN 1090-4:2018:
— Fundamental revision of the standard and adaptation to the current state of science and technology.
This document is part of the EN 1090 series, which comprises the following parts:
— EN 1090-1, Execution of steel structures and aluminium structures — Part 1: Assessment and
verification of constancy of performance for structural components
— EN 1090-2, Execution of steel structures and aluminium structures — Part 2: Technical requirements
for steel structures
— EN 1090-3, Execution of steel structures and aluminium structures — Part 3: Technical requirements
for aluminium structures
— EN 1090-4, Execution of steel structures and aluminium structures — Part 4: Technical requirements
for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall
applications
— EN 1090-5, Execution of steel structures and aluminium structures — Part 5: Technical requirements
for cold-formed structural aluminium elements and cold-formed structures for roof, ceiling, floor and
wall applications
prEN 1090-4:2025 (E)
1 Scope
This document specifies requirements for the execution, i.e. the manufacture and the installation, of cold-
formed structural steel members and profiled sheeting and cold-formed structures for roof, ceiling, floor,
wall and cladding applications.
This document applies to structures designed according to the EN 1993 series.
This document applies to structural members and profiled sheeting designed according to EN 1993-1-3.
This document can be used for structures designed according to other design rules provided that
conditions for execution comply with them and any necessary additional requirements are specified.
This document also specifies requirements for the execution i.e. the manufacture and the installation of
structures made from cold-formed profiled sheeting for roof, ceiling, floor and wall applications under
predominately static loading or seismic loading conditions and their documentation.
This document covers structural profiled sheeting of Structural Class I and II and structural profiled
sheeting in Structural Class III according to EN 1993-1-3 used in structures.
NOTE 1 In National Annexes of EN 1993-1-3 specifications can be given regarding the use of the Structural
Classes.
This document covers structural members of all structural classes according to EN 1993-1-3.
Structural profiled sheeting is understood here to be:
— profiled sheet, such as trapezoidal, sinusoidal or liner trays (Figure 1).
Structural members are understood here to be:
— members (linear profiled cross sections) that are produced by cold forming (Figure 2).
This document also covers:
— not welded built-up sections (Figure 2d);
— cold-formed closed and hollow sections including the welding of the longitudinal seam (Figure 2b and
Figure 2c), not covered by EN 10219-1;
— perforated, punctured and micro profiled sheeting and members;
The welding of built-up sections are not covered. The welding provisions are given in EN 1090-2.
This document also covers spacer constructions between the outer and inner or upper and lower skins
for roofs, walls and ceilings made from cold-formed profiled sheeting and the connections and
attachments of the afore mentioned elements as long as all has a structural purpose.
This document covers steel profiled sheeting for composite floors, e.g. during installation and in stage of
pouring concrete.
This document also covers the deconstruction of structures made from cold-formed profiled sheeting and
structural members for roof, ceiling, floor and wall applications.
Composite structural members where the interaction between dissimilar materials are an integral part
of the structural behaviour such as sandwich panels and composite floors are not covered by this
document.
This document does not cover the necessary analyses and detailing and execution rules for thermal
insulation, moisture protection, noise control and fire protection.
prEN 1090-4:2025 (E)
This document does not cover regulations of roof cladding and wall cladding, produced by traditional
plumber methods or tinsmith methods.
This document does not cover detailed requirements for water tightness or air permeability resistance
and thermal aspects of profiled sheeting.
NOTE 2 The structures covered in this document can be for example.
— single- or multi-skin roofs, whereby the load-bearing structure (lower skin) or the actual roof covering (upper
skin) or both consist of cold-formed structural members and profiled sheeting;
— single- or multi-skin walls whereby the load-bearing structure (inner skin), the actual cladding (outer skin) or
both consist of cold-formed structural members and profiled sheeting, or
— trusses from cold-formed members.
NOTE 3 Structures can consist of an assembly of structural members and profiled sheeting made of steel
according to EN 1090-4 and of aluminium according to EN 1090-5.
Figure 1 — Examples of profiled sheeting
prEN 1090-4:2025 (E)
b) closed cross sections
a) single open cross sections c) hollow sections
d) built-up sections
Figure 2 — Examples of members
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes 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 1187, Test methods for external fire exposure to roofs
EN 508-3, Roofing and cladding products from metal sheet — Specification for self-supporting products of
steel, aluminium or stainless steel sheet — Part 3: Stainless steel
EN 1090-1, Execution of steel structures and aluminium structures — Part 1: Requirements for conformity
assessment of structural elements
EN 1090-2:2018+A1:2014, Execution of steel structures and aluminium structures — Part 2: Technical
requirements for steel structures
EN 1990, Eurocode - Basis of structural and geotechnical design
EN 1993-1-3:2024, Eurocode 3 — Design of steel structures — Part 1-3: General rules — Supplementary
rules for cold-formed members and sheeting
EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for
buildings
EN 10143, Continuously hot-dip coated steel sheet and strip - Tolerances on dimensions and shape
EN 10152, Electrolytically zinc coated cold rolled steel flat products for cold forming - Technical delivery
conditions
EN 10162:2003, Cold rolled steel sections — Technical delivery conditions — Dimensional and cross-
sectional tolerances
EN 10169:2022, Continuously organic coated (coil coated) steel flat products — Technical delivery
conditions
prEN 1090-4:2025 (E)
EN 10204, Metallic products — Types of inspection documents
EN 10346, Continuously hot-dip coated steel flat products for cold forming — Technical delivery conditions
EN 13501-5, Fire classification of construction products and building elements - Part 5: Classification using
data from external fire exposure to roofs tests
EN 13523-1, Coil coated metals - Test methods - Part 1: Film thickness
EN 13523-6, Coil coated metals - Test methods - Part 6: Adhesion after indentation (cupping test)
EN 13523-7:2021, Coil coated metals — Test methods — Part 7: Resistance to cracking on bending (T-bend
test)
EN 13523-8, Coil coated metals - Test methods - Part 8: Resistance to salt spray (fog)
EN 13523-10, Coil coated metals - Test methods - Part 10: Resistance to fluorescent UV radiation and water
condensation
EN 13523-19, Coil coated metals - Test methods - Part 19: Panel design and method of atmospheric exposure
testing
EN 13523-21, Coil coated metals - Test methods - Part 21: Evaluation of outdoor exposed panels
EN 13523-26, Coil coated metals - Test methods - Part 26: Resistance to condensation of water
EN 15048-1:2016, Non-preloaded structural bolting assemblies - Part 1: General requirements
EN 62305-3:2011, Protection against lightning - Part 3: Physical damage to structures and life hazard (IEC
62305-3)
EN 62561-1, Lightning Protection System Components (LPSC) - Part 1: Requirements for connection
components (IEC 62561 1)
EN ISO 717-1, Acoustics - Rating of sound insulation in buildings and of building elements - Part 1: Airborne
sound insulation (ISO 717-1)
EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test
methods (ISO 1461)
EN ISO 2081, Metallic and other inorganic coatings - Electroplated coatings of zinc with supplementary
treatments on iron or steel (ISO 2081)
EN ISO 2409, Paints and varnishes - Cross-cut test (ISO 2409)
EN ISO 2808, Paints and varnishes - Determination of film thickness (ISO 2808)
EN ISO 2810, Paints and varnishes - Natural weathering of coatings - Exposure and assessment (ISO 2810)
EN ISO 4042, Fasteners - Electroplated coating systems (ISO 4042)
EN ISO 4136, Destructive tests on welds in metallic materials - Transverse tensile test (ISO 4136)
prEN 1090-4:2025 (E)
EN ISO 4628-2, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and
size of defects, and of intensity of uniform changes in appearance - Part 2: Assessment of degree of blistering
(ISO 4628-2)
EN ISO 4628-3, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and
size of defects, and of intensity of uniform changes in appearance - Part 3: Assessment of degree of rusting
(ISO 4628-3)
EN ISO 4628-4, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and
size of defects, and of intensity of uniform changes in appearance - Part 4: Assessment of degree of cracking
(ISO 4628-4)
EN ISO 4628-5, Paints and varnishes - Evaluation of quantity and size of defects, and of intensity of uniform
changes in appearance - Part 5: Assessment of degree of flaking (ISO 4628-5)
EN ISO 4628-8, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and
size of defects, and of intensity of uniform changes in appearance - Part 8: Assessment of degree of
delamination and corrosion around a scribe or other artificial defect (ISO 4628-8)
EN ISO 5173, Destructive tests on welds in metallic materials - Bend tests (ISO 5173)
EN ISO 6270-1, Paints and varnishes - Determination of resistance to humidity - Part 1: Condensation
(single-sided exposure) (ISO 6270-1)
EN ISO 6507 (all parts), Metallic materials — Vickers hardness test (ISO 6507)
EN ISO 8492, Metallic materials - Tube - Flattening test (ISO 8492)
EN ISO 8493, Metallic materials - Tube - Drift-expanding test (ISO 8493)
EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227)
EN ISO 11654, Acoustics - Sound absorbers for use in buildings - Rating of sound absorption (ISO
11654:1997)
EN ISO 12944-2, Paints and varnishes - Corrosion protection of steel structures by protective paint systems
- Part 2: Classification of environments (ISO 12944-2)
EN ISO 12944-4, Paints and varnishes - Corrosion protection of steel structures by protective paint systems
- Part 4: Types of surface and surface
...