UK Regulations and Industry Standards on Metal Roof Corrosion Protection

Metal roofing is widely used across the UK for its durability, strength, and longevity. However, corrosion, particularly cut edge corrosion remains a significant challenge that can impact the structural integrity and lifespan of metal roofs. To ensure effective protection against corrosion, the UK has established a range of regulations and industry standards and this article explores these regulations, the materials and coatings used for corrosion protection and the best practices.

UK Building Regulations and Compliance

The UK Building Regulations provide a framework for construction and maintenance to ensure safety, durability, and sustainability. Several Approved Documents and British Standards apply to metal roofing corrosion protection.

Building Regulations 2010 (Part L and Part C)

Part L (Conservation of Fuel and Power) requires that roofing materials, including metal, contribute to energy efficiency and prevent thermal bridging, which can lead to condensation and subsequent corrosion. Part C (Site Preparation and Resistance to Contaminants and Moisture) emphasises the need for proper moisture control to prevent corrosion due to water ingress and condensation.

BS EN 1090-1:2009+A1:2011 (Structural Steel and Aluminium)

This standard mandates that structural components of metal roofs be manufactured and installed in accordance with CE marking and performance requirements, including corrosion resistance.

BS EN 14782:2006 (Self-Supporting Metal Sheet Roofing)

This standard specifies the requirements for factory-produced, self-supporting metal sheet roofing to ensure they meet corrosion resistance standards and long-term durability.

BS EN ISO 12944 (Protective Coatings for Corrosion Protection of Steel Structures)

This standard establishes a classification system for corrosivity categories and provides guidance on selecting appropriate coatings based on environmental conditions.

Industry Standards and Best Practices

In addition to legal regulations, various industry best practices and certifications ensure that metal roofing remains resistant to corrosion.

National Federation of Roofing Contractors (NFRC) Guidelines

The NFRC provides guidelines on material selection, installation practices, and maintenance to extend the lifespan of metal roofs.

Construction Products Regulation (CPR) 305/2011/EU

This regulation enforces the CE marking of construction products, including metal roofing sheets, to ensure compliance with safety and durability standards.

British Coatings Federation (BCF) Standards

The British Coatings Federation provides industry-recognised guidelines for protective coatings, including liquid-applied roofing solutions that prevent corrosion.

BRE Digest 347 Corrosion of Metals in Buildings)

This document from the Building Research Establishment (BRE) highlights factors affecting corrosion, such as environmental conditions and material compatibility.

Corrosion Protection Methods

Metal roofing systems can be safeguarded against corrosion using various protective methods, including:

Protective Coatings

Galvanisation (BS EN ISO 1461) involves applying a zinc coating to steel to prevent rusting. Powder Coating (BS EN 13438:2013) is a dry finishing process providing a durable corrosion-resistant layer. Allbase Polyurethane, Polyurea, and Hybrid Coatings are liquid-applied protective roofing systems that create a seamless barrier against moisture and environmental pollutants.

Proper Drainage and Ventilation

Ensuring adequate roof slope and drainage reduces standing water, preventing accelerated corrosion. Ventilation systems help control condensation, mitigating internal moisture-related corrosion.

Material Selection and Alloy Use

Stainless steel and aluminium are inherently corrosion-resistant materials commonly used for metal roofing. Copper and zinc roofing develop a natural patina over time, offering long-term corrosion resistance.

Regular Inspection and Maintenance

Periodic roof inspections, as recommended in BS 6229:2018 (Flat Roofs with Continuously Supported Flexible Waterproof Coverings), help identify early signs of corrosion and address them promptly.

Conclusion

Compliance with UK regulations and industry standards is crucial for ensuring the longevity and performance of metal roofing systems. By adhering to the guidelines set by British Standards, Building Regulations, and industry best practices, property owners and roofing professionals can effectively mitigate the risks of metal roof corrosion. Implementing the right materials, coatings, and maintenance strategies ensures that metal roofing remains a durable and cost-effective choice for commercial and residential buildings in the UK.

Allbase specialises in high-performance liquid-applied roofing systems designed for metal roofs to prevent corrosion and extend their lifespan. Our advanced primers and systems, including polyurethane, polyurea, and hybrid coatings, offer seamless protection against moisture and environmental damage, ensuring long-lasting durability. Contact Allbase to learn how these innovative roofing systems can repair and protect your metal roofs for years to come.