EN1090-2 steel fabrication

Got a structural project coming up? Be aware that under EU and UK law, you must ensure your manufacturing supplier has appropriate EN1090-2 accreditation.

What is EN1090?

On 1 July 2014, under the umbrella of the EU’s Construction Products Regulation (CPR) (introduced to harmonise safety and traceability in the construction industry), EN1090 and CE marking for structural steel components became a legal requirement. This made it a criminal offence to sell these products on the European market without CE marking.

If you require anything structural, you must only use a supplier with EN1090 accreditation to manufacture it. If you don’t and the structure fails or is faulty, you could be liable. In extreme circumstances, this could mean prosecution and imprisonment. (This doesn’t apply to the design and installation of construction products, only the manufacturing.)

EN1090 comprises of three sections with four execution classes. Alroys is certified to EN 1090-2, execution class 2. What do we mean by execution class?

An execution class defines the areas in which manufacturers are qualified to work.

For example:

  • Execution class 1 – includes handrails, stairs and railings in residential buildings and agricultural buildings (e.g. barns)
  • Execution class 2 – most structural requirements within commercial buildings
  • Execution class 3 – bridges, stadiums and high-rise buildings (more than 15 floors)
  • Execution class 4 – bridges over densely populated areas and high hazard industrial plants

For a more detailed explanation of Execution Classes Click Here.

Why should you be interested in EN 1090-2?

Simply put, EN 1090-2 affects businesses like yours, requiring steel structures, because it’s a legal requirement. The aim of EN 1090 is to ensure that anything structural is:

  • constructed with the correct materials
  • constructed using qualified labour
  • tested thoroughly for structural integrity

Finally, any manufacturer holding this accreditation must have taken all necessary steps to prevent the structure failing.

What is your responsibility under EN1090-2?

Unfortunately, four years on, it seems the message is still not getting through.

If you’re failing to comply with the legislation, you are committing a criminal offence, and you risk invalidating project insurance and warranties. In some cases this may be unintentional as many procurement departments are unaware of the regulations.

It is you and your designers’ responsibility to determine if your requirement is structural. If it is, you must use an EN 1090 (CE marking) certified sub-contractor, like Alroys, and determine which execution class your structure falls into.

EN1090-2 steel fabrication

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Projects we’ve worked on involving EN1090-2

Adding structural steel supports between structural beams

Our customer wanted to create an open plan space by removing the supporting walls in four locations. Structural steel supports were needed to span the existing structural beams, adding structural support and integrity to the building.

The customer suggested fixings which required large fixing holes and which we believed would weaken the structure. Instead, we suggested an alternative fixing which offered a more structurally sound building, reduced drilling time and fixing costs (which, of course, we passed on to the customer!).

During our site visit, we used a cover meter to locate any steels in the concrete around the fixing points to ensure that the hole positions in our fixing plates avoided these areas. Installation ran smoothly and our customer was thrilled with the result.

Creating steel framework to support four roller shutter doors and cladding

In this example, our customer wanted to create faster fork truck access to their premises whilst maintaining internal room temperature and minimising contamination from outside.

We were given a strict deadline for installation of the steel framework even though it hadn’t been fully designed by our customer’s architect. To speed up the process, we offered our assistance with design, adding missing components such as connector brackets and purlins (which required liaison with the purlin manufacturer for exact specifications). This meant we were able to submit drawings for the structural engineer’s approval early, and delivered the project on time.

These are just a few examples of the work we’ve done for satisfied customers. You can find more on our case studies page.

Do you require assistance with a project falling under the scope of the EN1090-2 legislation? Why not contact us today to find out how we can help?

Understanding Execution Classes

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STEP 1 – Define the consequence class

A consequence class describes the consequences of structural failure or malfunction, which means structures can be constructed with the appropriate level of quality control.

The table below is taken from standard EN1990.

Consequence Class

Description

Examples of buildings & civil engineering works

CC3

High consequence for loss of human life, or economic, social or environmental consequences very great Grandstands, public buildings where consequences of failure are high (e.g. a concert hall)

CC2

Medium consequence for loss of human life, economic, social or environmental consequences considerable Residential and office buildings, public buildings where consequences of failure are medium (e.g. an office building)

CC1

Low consequence for loss of human life, and economic, social or environmental consequences small or negligible Agricultural buildings where people do not normally enter (e.g. storage buildings) greenhouses

STEP 2 – Select a service category

Service categories reflect risks such as fatigue and likelihood of seismic activity. They also look at stress levels in the components in relation to their resistance.

Table 2 – Suggested criteria for service categories

Categories

Criteria

SC1

  • Structures and components designed for quasi static actions only (e.g. buildings)
  • Structures and components with their connections designed for seismic actions in regions with low seismic activity and in DCL*
  • Structures and components designed for fatigue actions from cranes (class S0)**

 

SC2

  • Structures and components designed for fatigue actions according to EN 1993. (e.g. road and railway bridges, cranes (class S1-S9)**, structures susceptible to vibrations induced by wind, crowd or rotating machinery)
  • Structures and components with their connections designed for seismic actions in regions with medium or high seismic activity and in DCM* and DCH*

*DCL, DCM, DCH: ductility classes according to EN 1998-1

**For classification of fatigue actions from cranes, see EN 1991-3 and EN 13001-1

Please note that a structure or part of a structure can contain components or structural details that belong to different service categories.

STEP 3 – Select a production category

Production categories describe the risks arising from the fabrication complexity of a structure and its components.

A structure, or part of a structure, may contain components or structural details that belong to different production categories. However, the execution class is not always sensitive to the production category.

Table 3 – Suggested criteria for production categories

Categories

Criteria

PC1

  • Non welded components manufactured from any steel grade products
  • Welded components manufactured from steel grade products below S355

PC2

  • Welded components manufactured from steel grade products from S355 and above
  • Components essential for structural integrity that are assembled by welding on construction site
  • Components with hot forming manufacturing or receiving thermic treatment during manufacturing
  • Components of CHS lattice girders requiring end profile cuts

STEP 4 – Use the recommended matrix to determine execution class

Input the information gathered in steps 1, 2 and 3 into the matrix table below and you can now determine which execution class is required.

Table 3 – Recommended matrix for determination of execution classes

Consequence classes

CC1

CC2

CC3

Service categories

SC1

SC2

SC1

SC2

SC1

SC2

Production categories

PC1

EXC1

EXC2

EXC2

EXC3

EXC3a

EXC3a

PC2

EXC2

EXC2

EXC2

EXC3

EXC3a

EXC4

NB: EXC4 should be applied to special structures or structures with extreme consequences of a structural failure as required by national provisions.

How does this work in practice?

Here’s a scenario to show you this process working in real life.

An office building with four floors and 30 employees requires a steel staircase. The staircase is a welded fabrication using steel grade products from S355 and above.

  • Step 1 – The consequence class would be CC2 (Medium consequence for loss of human life)
  • Step 2 – The service category would be SC1 (Structures and components designed for quasi static actions only, e.g. buildings)
  • Step 3 – The production category would be PC2 (Welded components manufactured from steel grade products from S355 and above)

Using these results in the matrix table above, the execution class required would be EXC2.

What if I choose a non-certified sub-contractor?

For obvious reasons it’s something we don’t advise as the penalties could be enormous. Let’s consider some of the consequences you could face:

  • Major failure of structure or components causing serious injury or death
  • Breach of formal client contract
  • Breach of building regulations
  • Breach of NHBC requirements
  • Breach of standard building insurance
  • Contractual dispute – financial implications
  • Supplier prosecution by Trading Standards
  • Major non-conformance or withdrawal of ISO 9001 accreditation

Alroys Fabrication Services

Metal Fabrication & Welding

Not to be confused with sheet metal work, metal fabrication employs techniques such as cutting, drilling and welding to manipulate and mould metal structures

Installation (Design & Fit)

From initial design concepts through to final installation, using the latest software and high-tech machinery, you can trust Alroys to deliver your project on time and on budget.

EN1090-2 Steel Fabrication

Got a structural project coming up? Be aware that under EU and UK law, you must ensure your manufacturing supplier has appropriate EN1090-2 accreditation.

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