Designed for compliance. Built to perform.
In today’s built environment, compliance, performance and environmental responsibility are expected – not optional. Protex® is Firth Steels’ response to that demand: a unified family of building envelope systems, engineered for roof and wall applications. It delivers consistent, dependable performance, while offering flexibility, clarity and peace of mind to specifiers, developers and contractors.
Rather than a single product, Protex® represents a strategic umbrella. It brings together multiple independently tested, built-up systems under one trusted brand. Whether you’re constructing new industrial units, retrofitting ageing assets or aiming to reduce embodied carbon, Protex® provides a clear route to regulatory confidence and long-term value.
A building envelope refers to the physical barrier between a building’s interior and the outside environment. It typically includes the roof, walls, cladding, insulation, fixings and structural elements – all working together to regulate temperature, control air movement and ensure acoustic and fire performance.
In essence, the envelope protects the internal environment while contributing significantly to energy efficiency and occupant comfort. That’s why we created Protex® to simplify the design and specification of building envelope systems.
With tailored options for new builds, retrofits, and low-carbon construction, each Protex® solution is built around three key principles: performance, compliance and practicality.
We design Protex® systems to achieve certified non-fragility, both during installation and in their final installed state – providing safety and assurance for contractors, clients and facilities teams.
Thanks to excellent thermal performance and airtightness, our systems help reduce in-use emissions and long-term energy consumption.
We test every system to current fire safety standards, offering A1 non-combustible coatings to meet even the strictest compliance requirements.
Our systems come with up to 40-year coating warranties and 25-year system guarantees, giving you long-term protection and peace of mind.
Choose from a wide range of colours, profiles and finishes including matt, metallic and embossed options to meet functional and architectural needs.
You can configure Protex® to suit project-specific noise performance, using options like perforated liners and bespoke build-ups.
Proven. Compliant. Consistent.
Classic delivers fire, thermal and acoustic compliance with straightforward installation. It’s ideal for industrial and commercial projects that demand speed, reliability and clear documentation.
Rethink. Rebuild. Recertify.
Encase is our retrofit over-cladding solution, designed to extend building life with minimal disruption. While the system uses certified components, the final performance depends on the condition of the existing structure.
Each system includes supporting technical documentation, NBS specifications and standard detail packs – enabling smooth and confident specification.
We’ve supplied Protex® systems to hundreds of UK buildings from logistics hubs and retail parks to training centres and commercial developments. Our manufacturing base in West Yorkshire ensures consistency and quality, while our in-house technical team supports you every step of the way.
As a result, architects, developers and main contractors across the country trust Protex® to deliver performance without compromise.
