SIST EN 1999-1-4:2023/oprA1:2026

Eurocode 9 - Design of aluminium structures - Part 1-4: Cold-formed structural sheeting

1.1   Scope of EN 1999-1-4
(1)   EN 1999-1-4 gives design requirements for cold-formed trapezoidal aluminium sheeting. It applies to cold-formed aluminium products made from hot rolled or cold rolled sheet or strip that have been cold-formed by such processes as cold-rolled forming or press-breaking.
NOTE 1   The rules in this part complement the rules in other parts of EN 1999-1.
NOTE 2   The execution of aluminium structures made of cold-formed structures for roof, ceiling, floor and wall applications is covered in EN 1090-5.
(2)   EN 1999-1-4 gives methods for stressed-skin design using aluminium sheeting as a structural diaphragm.
(3)   EN 1999-1-4 does not apply to cold-formed aluminium profiles like C- and Z- profiles nor cold-formed and welded circular or rectangular hollow sections.
(4)   EN 1999-1-4 gives methods for design by calculation and for design assisted by testing. The methods for the design by calculation apply only within stated ranges of material properties and geometrical properties for which sufficient experience and test evidence is available. These limitations do not apply to design by testing.
(5)   EN 1999-1-4 does not cover load arrangement for loads during execution and maintenance.
1.2   Assumptions
(1) For the design of new structures, EN 1999 is intended to be used, for direct application, together with EN 1990, EN 1991, EN 1992, EN 1993, EN 1994, EN 1995, EN 1997 and EN 1998.
EN 1999 is intended to be used in conjunction with:
-   European Standards for construction products relevant for aluminium structures;
-   EN 1090-1, Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components;
-   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.

Eurocode 9 - Bemessung und Konstruktion von Aluminiumtragwerken - Teil 1-4: Kaltgeformte Profiltafeln

Eurocode 9 - Calcul des structures en aluminium - Partie 1-4 : Tôles de structure formées à froid

Evrokod 9 - Projektiranje konstrukcij iz aluminijevih zlitin - 1-4. del: Hladno oblikovane konstrukcijske pločevine

1.1 Področje uporabe EN 1999-1-4
(1) EN 1999-1-4 določa zahteve za projektiranje hladno oblikovanih trapeznih aluminijastih plošč. Uporablja se za hladno oblikovane aluminijaste izdelke, izdelane iz vroče valjanih ali hladno valjanih pločevin ali trakov, ki so bili hladno oblikovani s postopki, kot so hladno valjanje ali upogibanje s stiskanjem.
OPOMBA 1 Pravila v tem delu dopolnjujejo pravila v drugih delih EN 1999-1.
OPOMBA 2 Izvedba aluminijastih konstrukcij iz hladno oblikovanih struktur za aplikacije na strehah, stropih, tleh in stenah je zajeta v EN 1090-5.
(2) EN 1999-1-4 določa metode za projektiranje z napetostno membrano z uporabo aluminijastih plošč kot strukturne membrane.
(3) EN 1999-1-4 se ne uporablja za hladno oblikovane aluminijaste profile, kot so C- in Z- profili, niti za hladno oblikovane in varjene krožne ali pravokotne votle profile.
(4) EN 1999-1-4 določa metode za projektiranje z izračunom in za projektiranje s pomočjo testiranja. Metode za projektiranje z izračunom se uporabljajo le znotraj določenih razponov lastnosti materialov in geometrijskih lastnosti, za katere so na voljo zadostne izkušnje in dokazi iz testiranj. Te omejitve ne veljajo za projektiranje s testiranjem.
(5) EN 1999-1-4 ne zajema razporeditve obremenitev med izvedbo in vzdrževanjem.
1.2 Predpostavke
(1) Za projektiranje novih konstrukcij je EN 1999 namenjen za neposredno uporabo skupaj z EN 1990, EN 1991, EN 1992, EN 1993, EN 1994, EN 1995, EN 1997 in EN 1998.
EN 1999 je namenjen za uporabo v povezavi z:
- Evropskimi standardi za gradbene proizvode, ki so pomembni za aluminijaste konstrukcije;
- EN 1090-1, Izvedba jeklenih konstrukcij in aluminijastih konstrukcij - 1. del: Zahteve za ugotavljanje skladnosti strukturnih komponent;
- EN 1090-5, Izvedba jeklenih konstrukcij in aluminijastih konstrukcij - 5. del: Tehnične zahteve za hladno oblikovane strukturne aluminijaste elemente in hladno oblikovane strukture za aplikacije na strehah, stropih, tleh in stenah.

General Information

• Status: Not Published
• Public Enquiry End Date: 28-May-2026
• ICS: 91.010.30 - Technical aspects
• ICS: 91.080.17 - Aluminium structures
• Technical Committee: KON - Structures
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 30-Mar-2026
• Due Date: 17-Aug-2026
• Ref Project: EN 1999-1-4:2023/prA1 - Eurocode 9 - Design of aluminium structures - Part 1-4: Cold-formed structural sheeting

Relations

• Amends: kSIST FprEN 1999-1-4:2022 - Eurocode 9 - Design of aluminium structures - Part 1-4: Cold-formed structural sheeting
• Effective Date: 30-Jul-2025

Overview

SIST EN 1999-1-4:2023/oprA1:2026 – part of Eurocode 9 – focuses on the design requirements for cold-formed structural sheeting made from aluminium. Developed by the European Committee for Standardization (CEN), this standard is integral to ensuring the safety, reliability, and efficiency of aluminium sheet structures used in construction. It specifically addresses products made from hot or cold rolled sheet or strip that are further processed by cold-forming methods such as roll-forming or press-braking. The scope does not cover cold-formed aluminium profiles like C- and Z-profiles or welded hollow sections.

This standard supplements the general rules provided in other parts of EN 1999 (Eurocode 9) and works in harmony with other related European standards, particularly for the execution and assessment of cold-formed aluminium structures used in roofing, ceilings, floors, and walls.

Key Topics

• Design Methods:
  EN 1999-1-4 details two primary methods for designing cold-formed aluminium sheeting:

  • Design by calculation – valid for defined material and geometric properties, supported by sufficient test evidence and practical experience.
  • Design assisted by testing – offers flexibility by allowing assessments beyond specific material or geometric limitations.

• Stressed-Skin Design:
  The standard describes how aluminium sheeting can be used as a structural diaphragm, contributing to overall building stability.

• Structural Joints and Connections:
  Provisions for the design and resistance of riveted joints subjected to shear forces, including key clarifications on overlap configurations (SOL-L and SOL-U).

• Figure Updates and Technical Clarifications:
  This amendment outlines new and revised figures for stiffened webs and overlapping sheeting configurations, helping to ensure correct application of support reactions for both lower and upper overlaps.

• Integration with Other Eurocodes:
  EN 1999-1-4 is designed to be used together with core European design standards (EN 1990 through EN 1998), ensuring consistency across projects incorporating composite or multi-material construction.

Applications

EN 1999-1-4 is essential for professionals involved in the design, specification, and assessment of:

• Aluminium roofing, ceiling, floor, and wall sheeting:
  Particularly in commercial, industrial, and residential buildings where lightweight, corrosion-resistant structural solutions are required.
• Structural diaphragms:
  Utilization of aluminium sheeting as a stressed skin element for efficient transfer of loads.
• Conformity Assessment:
  Supporting certification of aluminium structural components and compliance with regulatory requirements for safety, durability, and performance.
• Modification & Upgrades:
  The 2023 amendment ensures alignment with recent advancements and harmonization with other parts of the Eurocodes ecosystem.

Related Standards

• EN 1999 (all parts): The parent Eurocode for aluminium structures, covering both general and specialist applications.
• EN 1090-1: Requirements for conformity assessment of steel and aluminium structural components.
• EN 1090-5: Technical requirements for cold-formed structural aluminium elements and cold-formed structures for roof, ceiling, floor, and wall applications.
• EN 1990-1:2023+A1:2026: Basis of structural and geotechnical design for new structures.
• Other Eurocodes: Including EN 1991 (Actions on structures), EN 1992 (Concrete structures), EN 1993 (Steel structures), EN 1994 (Composite structures), EN 1995 (Timber), EN 1997 (Geotechnical), and EN 1998 (Earthquake resistance).

Conclusion:
SIST EN 1999-1-4:2023/oprA1:2026 is key for designers, engineers, and manufacturers committed to achieving safe, compliant, and cost-effective aluminium structures using cold-formed sheeting. Its synergy with the broader Eurocode framework supports robust structural performance and regulatory compliance for modern construction needs.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Evrokod 9 - Projektiranje konstrukcij iz aluminijevih zlitin - 1-4. del: Hladno
oblikovane konstrukcijske pločevine
Eurocode 9 - Design of aluminium structures - Part 1-4: Cold-formed structural sheeting
Eurocode 9 - Bemessung und Konstruktion von Aluminiumtragwerken - Teil 1-4:
Kaltgeformte Profiltafeln
Eurocode 9 - Calcul des structures en aluminium - Partie 1-4 : Tôles de structure
formées à froid
Ta slovenski standard je istoveten z: EN 1999-1-4:2023/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.17 Aluminijaste konstrukcije Aluminium structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 1999-1-4:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2026
ICS
English Version
Eurocode 9 - Design of aluminium structures - Part 1-4:
Cold-formed structural sheeting
Eurocode 9 - Calcul des structures en aluminium - Eurocode 9 - Bemessung und Konstruktion von
Partie 1-4 : Tôles de structure formées à froid Aluminiumtragwerken - Teil 1-4: Kaltgeformte
Profiltafeln
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 250.

This draft amendment A1, if approved, will modify the European Standard EN 1999-1-4:2023. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1999-1-4:2023/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modifications throughout the whole document . 4
2 Modification to 0.1, “Introduction to the Eurocodes” . 4
3 Modification to 0.2, “Introduction of EN 1999 (all parts)” . 4
4 Modification to 1.2, “Assumptions” . 4
5 Modification to Clause 2, “Normative references” . 4
6 Modification to 8.1.7.3 “Stiffened webs” . 5
7 Modification to 8.3.2, “Single overlap with overlapping lower sheeting (SOL-L)” . 5
8 Modification to 8.3.3, “Single overlap with overlapping upper sheeting (SOL-U)” . 6
9 Modification to 10.2.1, “Design resistances of riveted joints loaded in shear” . 6
10 Modification to 10.2.2, “General” .
...