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Home » Product Technology » Multi-Link-Panel Roofing System » Non-Fragile Roof Glazing
Non-fragility is a critical requirement for overhead roof glazing and is directly linked to safe access for inspection and maintenance. Industry guidance recognises falls through fragile roofs as a significant hazard, making the specification of tested non-fragile roof assemblies essential.
Importantly, non-fragility applies to the performance of a complete roofing system rather than an individual material. The interaction between glazing panels, fixings and supporting framework determines how a system behaves under impact, and even high-strength glazing can fail if it is not properly integrated into an engineered assembly.
The recognised method for assessing non-fragility is ACR[M]001:2019, which evaluates the performance of a representative roof assembly under controlled impact conditions. The test simulates a human fall onto a roof surface and classifies assemblies according to the extent of damage sustained.
Within this framework, a Class B designation represents the highest level of performance that can be achieved by polycarbonate roof glazing systems. Achieving and maintaining this classification requires careful engineering of both the glazing and the supporting structure.
Twinfix has invested in a dedicated in-house test rig constructed in accordance with ACR[M] requirements, enabling regular assessment of the Multi-Link-Panel NF assembly. This facility allows our engineering team to validate design refinements, confirm consistency of manufacture and ensure continued compliance with Class B performance criteria.
The Multi-Link-Panel NF system has been developed as an integrated assembly in which the aluminium framing, panel retention method and polycarbonate glazing work together to resist impact and prevent panel displacement. Every polycarbonate configuration within the Multi-Link-Panel NF range has achieved a Class B designation when tested as an assembly.
Comparative testing undertaken by Twinfix has demonstrated that alternative glazing arrangements, including polycarbonate and laminated glass installed in standard glazing bars, may not achieve equivalent performance. These findings reinforce the importance of system design and assembly testing in delivering reliable non-fragile roof solutions.
Through continuous testing and engineering development, Twinfix ensures that its non-fragile assemblies deliver consistent, verifiable safety performance alongside durability and effective daylight transmission.
At Twinfix, we provide a complete, end-to-end service for canopy and roof glazing projects across the UK. With over 35 years of experience, we combine technical expertise, innovation, and a commitment to quality to deliver safe, durable, and visually striking solutions. We are recognised experts in polycarbonate glazing, offering Georgian wired, solid, or multiwall options to suit a wide variety of applications.
We have worked closely with the team at Twinfix to deliver this project. Twinfix managed to deliver the design intention as visualised by our architects and fulfilled the client’s vision. It has been a pleasure working with Twinfix. The process from design to construction was easy, straightforward and very professional. We look forward to working with Twinfix on future projects and would highly recommend them.”
Saghir Hussain
Director, Create It Studio Architects
Our project portfolio reflects the successful delivery of thousands of canopy and roof glazing installations across the UK, covering education, healthcare, transport, retail and public sector environments. Each project demonstrates Twinfix’s ability to manage complex briefs, challenging sites and demanding performance requirements, from concept and design through to manufacture and installation. Together, these projects showcase our consistent delivery of high-quality, reliable and visually integrated solutions that add long-term value for our clients and their facilities.
Whether you’re in the early stages of planning or ready to move forward, our experienced team is here to support you every step of the way. From initial design advice and product selection through to technical guidance and installation planning, we’ll help you find the right canopy or roof glazing solution for your project. Simply share your requirements with us, and our experts will provide tailored recommendations to suit your site, budget, and timescales—ensuring a smooth process from concept to completion.
