Stainless Steel Roofing

Why Choose Stainless Steel Roofing?

Stainless steel is a hard metal roofing solution known for its:

• Exceptional durability
• Corrosion resistance
• Low maintenance requirements
• Long service life

Unlike lead, stainless steel is far less vulnerable to theft, making it particularly well-suited for projects in remote or unsecured areas, or where material security is a primary concern — including churches, listed buildings, heritage properties, and public buildings.

Substrate Design – In Accordance with BS6229

As with all hard metal roofing systems, the success of a stainless steel installation starts with substrate design. In line with BS6229:2018, which outlines the code of practice for flat and pitched roofs with continuous roof coverings:

• Substrates must be dry, dimensionally stable, and properly ventilated to prevent moisture build-up beneath the stainless steel covering.
• We ensure adequate falls, typically 1:80 or greater, for water runoff, and design for thermal movement and condensation control.
• GNR offers both ventilated cold roof systems and insulated warm roof constructions, depending on the requirements of the project.

We supply and install complete roofing systems with the appropriate substrate and underlays to support long-term performance.

Applications and Detailing

Stainless steel is an extremely versatile roofing material, suitable for a broad range of applications and detailing, including:

• Entire roof slopes on churches, schools, civic buildings, and heritage sites
• Box gutters, valley gutters, and parapet gutters
• Rainwater outlets, cappings, flashings, and complex junctions
• Domes, curved roofs, and architectural features

It can be formed using techniques similar to other hard metals like zinc, such as:

• Standing seam systems, ideal for sleek, modern finishes or large roof areas
• Batten roll and batten cap detailing, offering a more traditional aesthetic for conservation and ecclesiastical projects

The adaptability of stainless steel makes it equally at home on modern developments and restoration schemes.

Performance and Workability

Despite its strength, stainless steel is workable by skilled hands and can be cut, folded, and even soldered where required, allowing for seamless detailing in areas where mechanical fixings may be impractical.

As a hard metal, stainless steel provides:

• Outstanding resistance to UV exposure and atmospheric corrosion
• Minimal thermal expansion compared to other metals
• An incredibly long service life, often exceeding 60 years

It’s also environmentally friendly — 100% recyclable, and often made from a high proportion of recycled content.

Full Roofing Packages from GNR Roofing Services

At GNR Roofing Services, we have the technical expertise and practical experience to deliver stainless steel roofing packages of any size and complexity. Whether you’re undertaking a full building refurbishment, a conservation-led repair, or a new construction project, we can provide:

• Comprehensive project pricing and specifications
• Warm or vented substrate solutions
• Standing seam or batten roll detailing
• Bespoke metalwork fabrication
• Integration with insulation, drainage, and other roof components

Our team understands the unique demands of working on heritage buildings, and we work in close collaboration with conservation officers, architects, and clients to achieve a finish that is both technically sound and aesthetically appropriate.

Stainless Steel for Roofing Applications – Materials, Forming, and Versatile Use Cases

From GNR Roofing Services – Experts in Architectural Metal Roofing

Stainless steel continues to grow in popularity as a roofing and cladding material across both contemporary and heritage sectors. Known for its exceptional performance and longevity, it offers solutions not only for complete roof coverings but also as a complementary component in traditional leadwork. At GNR Roofing Services, we work with the best grades, tools, and forming techniques to deliver roofing systems that meet or exceed specification.

Types of Stainless Steel Used in Roofing

The most commonly used types of stainless steel for roofing are:

1. AISI 304 (EN 1.4301) – Austenitic Stainless Steel

• General-purpose grade, widely used for roof cladding in sheltered environments.
• Offers excellent corrosion resistance and good formability.
• Suitable for standing seam, batten roll, and general sheet applications.

2. AISI 316L (EN 1.4404) – Marine Grade Stainless Steel

• Enhanced corrosion resistance due to molybdenum content.
• Ideal for coastal, industrial, or polluted environments.
• Preferred for historic buildings, churches, and areas exposed to acidic rain or salt-laden air.

3. Ferritic Grades (e.g., EN 1.4509)

• Cost-effective alternative with good corrosion resistance.
• Typically used for less aggressive environments or short- to mid-term installations.

Stainless steels used in roofing are often given a tinned or matte finish to reduce reflectivity and enhance aesthetic appeal, particularly for use on listed and conservation buildings.

How Stainless Steel is Produced and Supplied

Stainless steel for roofing is produced using cold rolling techniques, creating thin, uniform sheets with a consistent surface finish and mechanical strength.

Roll Sizes Commonly Available:

• Widths: Typically 500mm, 600mm, 670mm, and 1000mm
• Thicknesses: Ranging from 0.4mm to 0.6mm for roofing and cladding applications
• Lengths: Supplied in coils or pre-cut lengths depending on project requirements

GNR can supply, handle, and cut materials to size, ensuring minimal waste and perfect fit for each installation.

Stainless Steel in Lead Roofing Applications

Stainless steel is increasingly used in conjunction with lead roofing, providing enhanced structural support and detail solutions where lead alone may not be ideal. This includes:

• Perimeter edge clips: Stainless steel clips are used to secure lead sheet while allowing for thermal movement.
• Ventilation details: Stainless steel provides the rigidity and durability required to form ventilation grilles, airflow hoods, and perimeter trims.
• Outlets and sumps: These are commonly formed in stainless steel and connected to lead gutters to enhance performance at drainage points.
• Gutter linings and separation layers: Stainless steel is also used as a lining or backing in concealed areas for reinforcement.

Stainless steel’s strength and non-reactivity make it an ideal companion to lead, especially where detailing requires mechanical stability and long-term performance.

Forming Stainless Steel for Roofing Applications

Forming stainless steel requires specialist tools and experienced operatives. At GNR Roofing Services, our trained teams use a combination of modern equipment and traditional methods to achieve precise and watertight results.

Common Forming Methods:

Tray Former

• Used to pre-fabricate standing seam trays and batten roll panels to exact dimensions.
• Ensures uniform profile and efficient installation.

Bending Machine

• Helps form long sections with consistent folds and profiles, particularly for large standing seam systems or wall cladding panels.

Hand Tools

• Precision hand tools are used to finish edges, form laps, hems, and complex junctions.
• Key for detailing on dormers, valleys, corners, and tight spaces.

Soldering Equipment

• Stainless steel can be soldered using acid-based fluxes and appropriate solder alloys.
• Ideal for creating watertight joints, outlets, and internal corners, particularly in heritage settings or where mechanical fixings are not suitable.

A Complete Stainless Steel Roofing Service from GNR

Whether you need a full stainless steel roof or stainless detailing as part of a lead or hybrid roofing system, GNR Roofing Services are fully equipped to deliver:

• Custom-cut stainless steel rolls and panels
• Standing seam and batten roll installations
• Soldered joints, vents, and outlets
• Integration with lead, zinc, and other hard metals
• Warm roof and ventilated substrate options
• Full refurbishment and conservation packages

Our team has extensive experience in heritage roofing, ecclesiastical works, public buildings, and bespoke architectural design — making us your ideal partner for projects requiring technical excellence and design integrity.

Partner with GNR for Stainless Steel Roofing Expertise

Stainless steel is more than just an alternative to lead — it’s a robust, flexible solution that complements tradition while meeting the demands of modern performance standards.

At GNR Roofing Services, we provide a complete package from design support to full installation, ensuring your roofing project is technically sound, aesthetically appropriate, and built to last.