kSIST FprEN 1090-4:2026
(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
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 03-Nov-2026
- Due Date
- 22-Dec-2026
kSIST FprEN 1090-4:2026 is the SIST version of the draft European Standard prEN 1090-4 from CEN/TC 135. It specifies technical requirements for the execution - meaning the manufacture and installation - of cold-formed structural steel members, profiled sheeting and cold-formed structures for roof, ceiling, floor, wall and cladding applications. The document is aimed at manufacturers, installers, designers and quality teams that need clear rules for materials, documentation, welding, fastening, tolerances, surface protection, inspection and deconstruction.
What does kSIST FprEN 1090-4:2026 specify?
kSIST FprEN 1090-4:2026 sets execution requirements for cold-formed structural steel elements and structures used in building envelopes and similar applications. It applies to structures designed to the EN 1993 series, especially structural members and profiled sheeting designed to EN 1993-1-3 and EN 1993-1-4.
The document also allows use with other design rules, but only when the execution conditions match those rules and any extra requirements are stated. It covers predominately static and seismic loading conditions, as well as documentation for the work.
It is organized into general clauses on scope, references, terms, documentation, products, manufacturing, welding, fastening, installation, surface protection, tolerances, inspection and deconstruction, followed by annexes that give detailed requirements and supporting information.
| Annex | What it covers |
|---|---|
| A | Basic requirements for profiled sheeting, including support, edges, building physics, roof drainage and walkability-related provisions |
| B | Additional design requirements for profiled sheeting, including serviceability, support widths, cantilevers and effective load width |
| C | Installation records |
| D | Geometrical tolerances, including essential and functional manufacturing tolerances |
| E | Corrosion protection by metallic coating with or without organic coatings, including suitability testing and monitoring |
| F | Additional information required or assumed when the main text says something shall be specified or not otherwise specified |
The scope is broad, but it stays within cold-formed steel execution. It includes not welded built-up sections, cold-formed closed and hollow sections with longitudinal seam welding, perforated and micro profiled sheets and members, spacer constructions with structural purpose, steel profiled sheeting for composite floors during installation, and deconstruction of these structures. It excludes composite structural members where dissimilar materials are part of the structural behaviour, such as sandwich panels and composite floors, and it does not set the detailed rules for thermal insulation, moisture protection, noise control, fire protection detailing, traditional plumber or tinsmith cladding methods, or detailed water-tightness, air permeability and thermal aspects of profiled sheeting.
What are the key requirements of kSIST FprEN 1090-4:2026?
kSIST FprEN 1090-4:2026 is mainly about controlling execution so the finished structure matches the design assumptions. Its key requirements are spread across the documentation, product, manufacturing, fastening, installation, protection and inspection clauses.
Specifications, records and traceability
Clause 4 requires an execution specification from the manufacturer and an installation specification from the installer, together with layout drawings, installation quality documentation and traceability records. This matters because the standard expects the work to be planned and recorded, not just assembled on site.
Installation documentation has to show that the work followed the installation specification, and the company responsible for installation signs a statement of completion. Traceability runs from material purchase through production and installation, so batches and delivered products can be linked back to their declared properties if a problem appears later.
Materials and product identification
Clause 5 requires materials to conform to the listed product standards or to have specified properties if they fall outside them. For steel products, the inspection document is 3.1 to EN 10204, and delivery identification must support traceability with product, batch, thickness, steel grade and corrosion protection information.
For profiled sheeting, the material rules point to EN 10346 and EN 508-3, with specific steel grades and coatings listed for profiled sheet use. The text also fixes a minimum yield strength for profiled sheets and states that deep drawing quality steels to EN 10346 are not permitted for profiled sheets. In practice, this means the manufacturer cannot substitute any convenient coil material without checking that it fits the execution rules.
Coatings, fire performance and lightning protection
Clause 5 also ties surface protection to Clause 10 and Annex E, so corrosion resistance must be selected and verified against the corrosivity category. External fire performance for roof outer layers has to be tested with the methods in CEN/TS 1187 and classified to EN 13501-5, while reaction to fire, resistance to fire and release of dangerous substances follow EN 1090-1.
If the steel element forms part of a lightning protection system, the standard points to EN 62305-3. That means the structural steel or sheeting cannot be treated as a purely architectural element when it is used as part of the building protection system.
Manufacturing, forming and welding
Clause 6 requires cold forming from steel sheet or strip/coil and says bent areas shall not show visible cracks. Hammering is not allowed, and stainless steel forming equipment must be cleaned when used on the same equipment as other steels unless equivalence is proven by testing.
Clause 7 applies EN 1090-2 welding provisions where appropriate and adds specific rules for the longitudinal seam of custom cold-formed closed and hollow sections. The welding procedure specification has to be based on a pre-production test to EN ISO 15613, and production control includes destructive testing and, where used, continuous monitoring such as eddy current inspection. Site welding on organic coated products is not permitted, and any impact on metallic coating and corrosion protection at welded locations has to be corrected.
Mechanical fastening and installation
Clause 8 covers screws, blind rivets and cartridge fired pins, including tool settings, application limits, edge distances and how sidelaps are joined. Fasteners must match the installation specification and the fastener manufacturer’s instructions, and the installer has to control hole size, tightening torque, perpendicular driving and washer compression.
After fastening, drilling swarf and broken mandrel stems must be removed from exterior surfaces to prevent corrosion. That is a practical point: the standard treats small debris as a durability risk, not just a housekeeping issue.
Site work, safety and final condition
Clause 9 sets site conditions, training of installation personnel, inspection of preceding works, layout drawing control, tools, fall protection, storage, lifting, laying, and post-installation cleaning. It requires weather and access conditions to be suitable before work starts, and it requires damaged products to be used only if capacity, serviceability and durability remain sufficient.
The clause also covers special matters such as diaphragm marking, protection against movement during interruption of work, and confirmation to the lightning protection specialist when the roof is used as a natural element of the system. In practice, this means the installer has responsibility for both safe working and the final technical condition of the installed structure.
Surface protection, tolerances and acceptance
Clause 10 deals with corrosion protection and maintenance for carbon steels, stainless steels and mixed metallic materials. Clause 11 distinguishes essential tolerances from functional tolerances, with special tolerances possible where they are specified for a project.
Clause 12 requires planned inspection, testing and correction, including checks of non-conforming products, manufactured dimensions, the installed structure and fastenings. Clause 13 extends the logic of safe site work to deconstruction, so removal of profiled sheeting also has to be planned, controlled and documented.
What terms does kSIST FprEN 1090-4:2026 define?
kSIST FprEN 1090-4:2026 defines the terms used to describe parts of the structure, the connection details and the execution controls.
- component I - the component facing the head of the fastener, usually the profiled sheeting.
- component II - the second component of the connection, usually the supporting member.
- decking - load-bearing profiled sheeting used to support insulation and an outer skin.
- decking edge trim - a fold at the free end of an outstand plane element that restrains local buckling and keeps the geometry under access loads.
- fastening - the fastener, the process of fastening and the final connected components.
- layout drawing - a drawing that shows the position of structural components and installation details.
- restraint - restriction of lateral, rotational or torsional movement that increases buckling resistance.
- structural cold-formed component - a load-bearing element made from steel sheet by cold rolling or press braking.
Who uses kSIST FprEN 1090-4:2026?
kSIST FprEN 1090-4:2026 is used by companies that manufacture cold-formed steel members and profiled sheeting, by installers who place and fix those products on site, and by designers who need execution rules to match the structural design. It is also relevant to quality managers and inspectors who prepare records, check traceability and verify conformity.
Typical users work in steel construction, building envelope work, roofing and cladding, and projects with single-skin or multi-skin roofs, walls, ceilings and floors. The document is also used where profiled sheeting forms part of composite floors during installation, where lightning protection has to be coordinated, and where structures may later be deconstructed.
What changed in kSIST FprEN 1090-4:2026 from the previous edition?
kSIST FprEN 1090-4:2026 states that it will supersede EN 1090-4:2018. The European foreword identifies the change as a fundamental revision of the standard and an adaptation to the current state of science and technology.
Which standards are used with kSIST FprEN 1090-4:2026?
kSIST FprEN 1090-4:2026 relies on a network of execution, design, product and test standards.
- EN 1090-1 - conformity assessment requirements for structural elements.
- EN 1090-2 - technical requirements for steel structures, especially welding and other general execution rules.
- EN 1090-5 - technical requirements for cold-formed structural aluminium elements and structures when steel and aluminium are combined.
- EN 1990 - basis of structural and geotechnical design, used for load combinations and serviceability checks.
- EN 1993-1-3 - cold-formed members and sheeting design rules, central to the scope of this part.
- EN 1993-1-4 - stainless steel design rules, relevant to stainless steel material selection.
- EN 1995-1-1 - timber design rules, used where timber supports are involved.
- EN 10346, EN 10169, EN 10143, EN 10152, EN 10162, EN 10204 - product delivery conditions, tolerances, coating and inspection documentation for steel and coated flat products.
- CEN/TS 1187 and EN 13501-5 - test and classification route for external fire performance of roofs.
- EN 62305-3 and EN 62561-1 - lightning protection design and connection components.
- EN ISO 15613, EN ISO 5173, EN ISO 8492, EN ISO 8493, EN ISO 4136, EN ISO 17639 - welding procedure qualification and destructive examination methods.
- EN ISO 12944 series, EN ISO 1461, EN ISO 2081, EN ISO 2409, EN ISO 2808, EN ISO 9227, EN ISO 6270-1, EN 13523 series - corrosion protection systems and coating tests.
- EN 14782 and EN 14783 - metal sheet product specifications used in related roofing and cladding applications.
- EN 12056 series - roof drainage references used in the annex on roof drainage.
What does the kSIST FprEN 1090-4:2026 document contain?
kSIST FprEN 1090-4:2026 contains practical execution rules, not just general principles. The body of the document gives methods and controls for documentation, product acceptance, forming, cutting, punching, welding, fastening, installation, corrosion protection, geometrical tolerances, inspection, correction and deconstruction.
It also contains tables for material grades, coating systems, inspection documents, tolerance limits, support conditions and corrosion protection suitability. The annexes add figures for profiled sheets, members, double layers, roof drainage, cantilevers and test specimens, along with tables for minimum roof pitch, support widths, coating performance and monitoring.
For a project team, the most useful parts are the detailed procedures in Clauses 4 to 13 and the annexes that support design and site work. For certification, QA and audits, the document gives the document trail, inspection points and test references that connect the installed product back to its declared properties and intended use.
Relations
- Effective Date
- 19-Jan-2023
- Effective Date
- 18-Jan-2023
- Effective Date
- 14-Sep-2022
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Frequently Asked Questions
kSIST FprEN 1090-4:2026 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
kSIST FprEN 1090-4:2026 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.
kSIST FprEN 1090-4:2026 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.
kSIST FprEN 1090-4:2026 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
oSIST prEN 1090-4:2025
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
oSIST prEN 1090-4:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 1090-4:2025
oSIST prEN 1090-4:2025
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.
oSIST prEN 1090-4:2025
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
oSIST prEN 1090-4:2025
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
oSIST prEN 1090-4:2025
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
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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
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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
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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
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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.
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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
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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
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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)
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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
...