Execution Class 2 (EXC2) – What is it, why do we need it, and why does it matter to you

At Cotswold Steel, quality, safety, and compliance form the foundation of our work. As part of our commitment to excellence, we adhere to Execution Class 2 (EXC2) under the BS EN 1090 standard for our welding processes. 

Why Cotswold Steel Chooses Execution Class 2 for Welding Under BS EN 1090

In this blog post, we’ll explore what BS EN 1090 and Execution Classes are, how EXC2 applies to our projects, and why it provides clear benefits for our clients.

What Is BS EN 1090?

BS EN 1090 is the European standard that governs the fabrication and assembly of steel and aluminium structures, ensuring they meet strict safety, performance, and quality standards. Compliance with this standard is legally required for manufacturers to issue CE marking (now UKCA for UK companies, introduced since our separation from the EU)  on structural steel and aluminium products used in construction projects across the UK and Europe.

The standard comprises three parts:

1. Part 1: Outlines conformity assessment and CE marking requirements.

2. Part 2: Focuses on technical requirements for steel structures.

3. Part 3: Covers aluminum structures.

Within BS EN 1090, Execution Classes (EXC) define the level of quality and inspection required for the fabrication and assembly process. These classes ensure that components and end product meet the necessary safety and durability standards for their intended use.

Understanding Execution Classes

A critical part of BS EN 1090 is the concept of Execution Classes (EXC), which specify the level of quality control and inspection required during fabrication and welding. The choice of Execution Class depends on factors such as the structure’s purpose, complexity, and safety requirements. Here’s a breakdown of the four classes:

1. EXC1: Simple Structures

• Scope: Small, low-risk structures like greenhouses, fences, or storage sheds.
• Requirements: Basic welding and inspection standards with minimal oversight.
• Risk Level: Low, as these structures generally pose little risk to life or property.

2. EXC2: Standard Structures
   

• Scope: Residential, commercial, and light industrial buildings, including offices, warehouses, and small bridges.
• Requirements: More rigorous welding procedures and inspection processes than EXC1, requiring certified welders and quality assurance.
• Risk Level: Medium, as these structures are widely used but do not face extreme loading or environmental challenges.

3. EXC3: Complex or High-Risk Structures

• Scope: Large-scale or high-risk projects like skyscrapers, large bridges, and heavy industrial plants.
• Requirements: Stricter welding tolerances, advanced inspection techniques (e.g., ultrasonic testing), and heightened oversight by qualified engineers.
• Risk Level: High, due to the potential consequences of failure in these critical structures.

4. EXC4: Exceptional Structures

• Scope: Extreme applications such as nuclear power plants, offshore platforms, or large stadiums.
• Requirements: The most stringent quality and safety standards, requiring specialised materials, highly skilled personnel, and comprehensive documentation.
• Risk Level: Very high, where failure could lead to catastrophic consequences.

Each Execution Class represents a step up in complexity, safety, and cost. For the work that we complete at Cotswold Steel, EXC2 is the most relevant class for us to adhere to in order for us to provide a high quality and compliant product for our clients.

Why Cotswold Steel Adheres to EXC2

At Cotswold Steel, we’ve chosen to standardise on EXC2 for all our welding processes. Here’s why this decision benefits our clients:

1. It Meets the Needs of Most Projects

EXC2 is ideal for the majority of construction projects, including residential developments, commercial buildings, and light industrial structures. By adhering to this class, we ensure our products meet the exacting standards required for these applications.

2. Enhanced Safety and Durability

The welding and inspection processes mandated under EXC2 ensure that our steel components are built to last. We use certified welding procedures and conduct detailed inspections, ensuring that every weld meets stringent strength and durability requirements.

3. Cost-Effective Quality Assurance

EXC2 provides the perfect balance between safety and efficiency. It ensures robust quality control measures are in place without overburdening projects with the higher costs associated with EXC3 or EXC4 standards.

4. Industry Alignment

Most engineers, architects, and contractors expect EXC2 as the default standard for structural steel. Adhering to this class ensures that our products integrate seamlessly into industry-standard projects, fostering collaboration and reducing the risk of delays.

5. Future-Proofing Your Projects

By choosing EXC2, you’re investing in a level of quality that ensures all of our steel structures will hold reliability for decades. This classification safeguards against potential issues, such as structural fatigue or failure, providing long-term peace of mind.

How We Maintain EXC2 Standards

• Certified Welders: All our welders are qualified to the standards required for EXC2, ensuring consistent performance and quality in every project. This qualification is renewed on a yearly basis and all fabricators that undertake out work are required to receive a satisfactory EX2 weld test certificate. 
• Documented Welding Procedures: Our welding procedures are fully compliant with BS EN 1090, providing traceability and accountability throughout the fabrication process. All of our work is checked and signed for by the individual fabricator and the works manager for each job. 
• Comprehensive Inspections: From visual checks to non-destructive testing methods, our inspection protocols ensure every weld meets EXC2 standards.
• Continuous Training and Investment: We invest in state-of-the-art equipment and ongoing training to stay at the forefront of industry standards.

Benefits for Our Clients

When you choose Cotswold Steel, you’re not just getting a product, you’re investing in quality, reliability, and peace of mind. Our compliance with industry standards provides you with:

• Reduced Risk: Adhering to EXC2 ensures that your steel components are fabricated to a level of quality that minimises structural risks.
• Compliance Made Simple: With Cotswold Steel, you can be confident your project complies with BS EN 1090 and all relevant regulations, simplifying the certification process.
• Predictable Costs and Timelines: EXC2 strikes a balance between robust quality control and cost efficiency, helping you stay within budget and on schedule.
• A Partner You Can Trust: Our commitment to EXC2 demonstrates our dedication to safety, quality, and customer satisfaction. All by making sure that the fabricators at Cotswold Steel are highly skilled, frequently trained and meticulous individuals. 

Ready to Work with Cotswold Steel?

If you’re planning a project that requires high-quality steel components fabricated to BS EN 1090 standards, let’s talk. Our team is ready to help you achieve compliance, ensure safety, and deliver exceptional results.