FD60 Fire Rated Steel Arch Doors Explained – Ultimate UK Guide for Buyers

Fire safety requirements rarely leave room for compromise, yet many projects still demand standout architectural detail. Steel arched doors sit right at that intersection: heritage-inspired curves, modern slim sightlines, and the potential to meet demanding fire performance targets. The key is understanding what “FD60” actually means in practice—and what to ask for before specifying or buying.

This guide breaks down FD60 fire rated steel arch doors in clear terms for UK buyers, from test standards and certification to glazing options, hardware, and common specification pitfalls. It also highlights how bespoke steel manufacturing makes it possible to reconcile fire performance with design intent—particularly where slim-frame, Crittall-style aesthetics are part of the brief.

What Does FD60 Mean for a Steel Arch Door?

In the UK, “FD60” typically indicates a fire door capable of resisting fire for 60 minutes under test conditions. In practical terms, that time rating is intended to help limit the spread of fire and smoke, protecting escape routes and giving occupants time to evacuate.

FD60 is a performance outcome, not a single material or construction method. A steel door can be engineered to meet FD60, but it must be built and tested as a complete assembly. That assembly includes the leaf, frame, seals, glazing (if used), hardware, and installation details.

FD60 vs FD30: Why the Rating Matters

FD30 (30 minutes) is common in many residential settings, while FD60 is often required in higher-risk situations, taller buildings, certain corridors, plant rooms, basements, and commercial premises. Building Control and the fire strategy determine the rating, so early coordination is essential—especially when an arched design is involved.

Upgrading from FD30 to FD60 is not simply “making it thicker.” It can affect sightlines, detailing around glass, the type of intumescent seals, and the approved hardware set. It also increases the importance of certified fabrication and installation.

UK Standards and Certification: What to Look For

Fire doors in the UK are typically assessed against established test standards and certification schemes. The exact pathway depends on the product type and project requirements, but credible evidence is always non-negotiable.

Fire Testing and Classification

Relevant UK and European test and classification standards are commonly referenced for fire resistance and smoke control. The most important concept is that the rating must relate to the door configuration being supplied—size ranges, glazing type, hardware, and frame details must match what was tested or formally assessed.

For arched steel doors, evidence should explicitly cover arched geometry or provide a robust field of application that includes arched variants. When evidence only covers rectangular leaves, assumptions about arches can lead to costly redesigns late in the project.

Third-Party Certification and Documentation

Reliable suppliers provide a documentation pack that may include test reports, classification reports, scope of certification, and installation instructions. The goal is straightforward: Building Control, the principal designer, the fire engineer, and the client should be able to trace what has been supplied back to a validated performance claim.

Requests that help clarify compliance include:

Confirmation of the fire rating and whether smoke control is included (for example, “Sa” or “S200” where applicable).
Evidence that the rating applies to the specific door size, leaf arrangement (single or double), and arched form.
Approved glazing specification (type, thickness, edge cover, bead design) for any glazed panels.
Approved hardware schedule: hinges, closers, locks, latches, panic hardware if required.
Installation instructions and compatible wall types (masonry, stud partitions, concrete).

Why Arched Steel Doors Are More Complex Than Rectangular Fire Doors

An arch is not just a visual feature; it changes how forces are distributed and how the door interfaces with the frame and the surrounding wall. When fire rating is introduced, tolerances, seal continuity, and glazing retention become even more sensitive.

Geometry, Tolerances, and Seal Continuity

Fire and smoke seals rely on consistent gaps. An arch increases the importance of precise fabrication because any waviness or mismatch can create inconsistent clearances at the head. In FD60 assemblies, this can affect performance, acoustic behaviour, and everyday usability.

Arched heads also require careful detailing for intumescent seals so that continuity is maintained around the curve. A credible FD60 arched door solution will show exactly how seals run, how corners transition, and how the frame is manufactured to support those seals.

Glazing in an Arch: Beads, Edge Cover, and Thermal Movement

Crittall-style steel doors often include glazing bars and multiple panes. In fire rated designs, glazing is a controlled system: the glass type, gasket materials, and the method of retaining the glass are all part of the tested assembly.

With arched doors, the top panes may follow the curve or sit beneath it. Either approach can work aesthetically, but the fire-rated detailing must remain within the certified scope. Slim-frame glazing and fine bars are possible in some systems, but they must be engineered around tested rules—especially regarding edge cover and the strength of glazing beads.

Steel as a Material for FD60 Doors: Benefits and Considerations

Steel is widely valued in architecture for its strength and the ability to create slim profiles. It also performs predictably under load, which helps maintain alignment and function over time—an important quality for doors expected to close reliably in normal use and during an emergency.

Strength and Slim Sightlines

Steel allows narrower sections than many alternative materials, supporting the sought-after slim-frame, industrial aesthetic. For many UK interiors, this is the look associated with Crittall-style doors: crisp lines, a strong grid, and maximum light transmission.

FD60 requirements can influence profile sizes and detailing, but steel remains one of the best options for combining structural rigidity with refined appearance, particularly in arched openings where stiffness helps preserve the curve and consistent margins.

Corrosion Protection and Finishes

Specification should consider where the door will be used: internal, sheltered external, or potentially exposed zones. Galvanising, primer systems, and powder coating all play a role in longevity. The finish also affects maintenance and the long-term look of the steel frame.

For projects aiming at premium results, it is worth confirming the full coating process, including how welds are treated, whether corners are ground smooth, and what quality controls are applied to achieve an even finish across curved components.

Glazing Options for FD60 Steel Arch Doors

Glazed fire doors are a common requirement where visibility and light matter—corridors, office partitions, hospitality spaces, and high-end residential interiors. With steel-framed systems, glazing can also be the primary design feature.

Fire Rated Glass: What Needs to Be Specified

Fire rated glass is not a single product category; it includes different technologies and performance characteristics. Some types primarily provide integrity (preventing flames and hot gases passing through), while others also provide insulation (reducing heat transfer). The fire strategy typically dictates which is required.

Key items to clarify in the specification include:

Required performance: integrity only or integrity plus insulation.
Fire rating duration: confirmed for 60 minutes in the intended configuration.
Glass thickness and pane size limits.
Approved gasket materials and glazing method (dry glazed, beads, or other tested approaches).
Visual qualities: tint, clarity, and any distortion expectations.

Single vs Double Glazing in Fire Rated Doors

Double glazing is often associated with improved thermal performance and acoustic comfort. In fire rated doors, however, not all double-glazed configurations are permissible, and some may increase thickness, change sightlines, or complicate certified detailing.

Where thermal efficiency is important—particularly in external or partially external situations—discussion should happen early. It is better to align the design intent with a certified system than to assume a preferred glazing build-up can be “made to work” later.

Smoke Control: The Overlooked Half of Fire Door Performance

Many real-world fire risks involve smoke rather than flames. Smoke control requirements may apply to doors on escape routes or in compartmentation strategies.

Smoke performance typically depends on the correct combination of leaf-to-frame gaps, perimeter seals, thresholds, and closers that ensure the door returns to the closed position. For an arched steel door, the head detail must be especially well-engineered so smoke seals remain continuous and effective along the curve.

Hardware for FD60 Steel Arch Doors: What Must Be Compatible

Hardware is not an afterthought for fire doors. It is part of the tested and approved assembly, and substitutions can invalidate the evidence package.

Closers, Hinges, and Latching

FD60 doors generally require a self-closing device unless the fire strategy permits alternative arrangements. The closer must be correctly sized and installed so the door closes from any open position and latches reliably.

Hinges must be rated appropriately, installed to the specified positions, and compatible with the door’s weight—particularly important for steel-framed, glazed leaves that can be heavy. Latching is also central to performance: a fire door is expected to be closed and positively held shut during a fire.

Access Control and Electric Locking

Many commercial and high-end residential projects integrate access control, electric strikes, magnetic locks, or monitored handles. These can be compatible with FD60 assemblies, but only when incorporated in an approved way.

Coordination questions to resolve early include cable routing, power transfer hinges, and how any cut-outs affect the door leaf. The safest approach is to specify access control in tandem with the door manufacturer rather than retrofitting on site.

Thermal Performance and Comfort: Setting Expectations

Steel doors are often specified internally for partitions and room dividers, but there is growing interest in thermally efficient steel systems for external envelopes and mixed internal/external thresholds. Fire rating adds constraints, yet it does not automatically exclude comfort-focused performance.

Thermal efficiency depends on multiple factors: frame design, thermal breaks (where relevant), glazing build-up, seals, and installation quality. For UK buyers, it is important to separate three scenarios:

Internal-only FD60 partitions: thermal performance may be less critical than acoustics and smoke control.
Between heated and unheated zones: thermal comfort can matter, especially near entrances, basements, or stair cores.
External applications: require careful coordination of weathering, drainage, and certified fire performance where applicable.

Where FD60 Steel Arched Doors Are Commonly Used in the UK

FD60 steel arch doors are often specified where high performance must coexist with strong design intent. Typical applications include:

Apartment and hotel corridors where compartmentation is crucial and sightlines matter.
Stair cores and lobbies requiring robust fire separation with a premium aesthetic.
Refurbishments of heritage buildings where arched openings are part of the existing architecture.
Basement conversions and projects with protected escape routes.
Commercial interiors seeking slim-frame glazing, visibility, and a refined industrial look.

Specifying FD60 Steel Arch Doors: A Buyer’s Checklist

The fastest way to reduce risk is to specify clearly and confirm what is being supplied before fabrication begins. The following checklist supports smoother procurement and fewer site issues.

1) Confirm the Fire Strategy Requirements

Required rating: FD60 (and whether “FD60S” or a smoke rating is required).
Direction of escape and any door swing constraints.
Whether hold-open devices are permitted and under what conditions.

2) Define the Door Configuration

Single, double, or double with active/inactive leaves.
Overall structural opening size, including the arch geometry (radius, spring points, and rise).
Desired sightlines, glazing bar layout, and whether the top glazing follows the curve.

3) Align Glazing With Certified Options

Fire rated glass type and performance (integrity vs integrity + insulation).
Pane sizes and grid layout compliant with the system’s limitations.
Privacy needs: clear, reeded, or other decorative effects only if compatible with fire-rated glass options.

4) Lock Down the Hardware Schedule

Closer model and mounting method.
Hinge type, quantity, and finish.
Locking: passage, deadlocking, escape hardware, or access control integration.
Threshold detail: level access, drop seal, or other approved solution.

5) Confirm Installation Requirements

Compatible wall type and minimum construction specification.
Fixing method, packers, and fire-stopping details around the frame.
Handover documentation and any maintenance requirements.

Common Mistakes to Avoid

Assuming Any Steel Door Can Be Made FD60

Fire rating is not a label that can be applied at the end. FD60 performance depends on a proven design and validated configuration. If the supplier cannot provide credible evidence for the arched, glazed, and hardware-specific build, the risk shifts to the project team.

Changing Glass or Hardware After Approval

Swapping glass for a different product, altering bead details, or changing closers to suit site preferences can undermine compliance. Any changes should be checked against the certification scope and agreed formally.

Underspecifying the Arch Geometry

“Arched door” can mean many things. Accurate dimensions, templates, or a clear radius specification prevents fabrication delays and site modifications that may compromise seals and performance.

Prioritising Sightlines Over Proven Detailing

Ultra-slim profiles look impressive, but fire-rated assemblies have minimums for glass retention, edge cover, and seal placement. A reputable manufacturer balances aesthetics with compliant construction rather than forcing proportions beyond what the system can support.

Design Notes: Achieving the Crittall-Style Look With FD60 Performance

Crittall-style is often used as shorthand for slim steel frames, a rectilinear grid, and a refined industrial aesthetic. Arched openings soften that geometry, creating a focal point that suits both period properties and contemporary interiors.

To achieve that look in an FD60 door without compromising performance, the best results typically come from:

Keeping the glazing layout logical, with pane sizes that suit the certified system.
Using consistent bar widths and aligning sightlines across adjacent partitions or screens.
Choosing finishes that complement the architecture: matte black for contrast, bronze tones for warmth, or lighter neutrals for minimalism.
Coordinating handles and hardware so the door reads as a cohesive design element, not a collection of add-ons.

Lead Times, Bespoke Manufacturing, and What Impacts Cost

FD60 steel arch doors are typically bespoke steel frames made to order, especially when the opening is non-standard or when glazing bars and sightlines are design-led. Cost and lead time are influenced by complexity: arched fabrication, glazing type, door size, hardware, finish, and documentation requirements.

Projects run more smoothly when the supplier is engaged early with drawings and performance requirements. Early engagement allows coordination of the arch geometry, glazing arrangement, and hardware so that the final door meets both the fire strategy and the design intent.

Choosing a Manufacturer: What “Good” Looks Like

A strong manufacturer relationship matters most when the door is both bespoke and performance-critical. Indicators of a reliable supplier include clear technical communication, transparent documentation, and the ability to coordinate design details with certification requirements.

Portamet supports design-led projects by manufacturing high-quality bespoke steel doors and windows with slim steel profiles and a focus on durability and refined craftsmanship. Custom-made production makes it possible to develop arched steel door designs that suit specific openings, glazing layouts, and interior concepts—while keeping performance requirements central to the specification process.

International projects are increasingly common, and steel-framed glazing is often coordinated across multiple locations. Portamet produces steel doors and windows for clients in the UK, across Europe, and for export markets including the USA, supporting consistent architectural intent across residential and commercial developments.

Final Thoughts: Getting an FD60 Steel Arch Door Right

FD60 fire rated steel arch doors can deliver a rare combination: strong architectural character, slim-frame glazing, and robust life-safety performance. The route to success is disciplined specification—confirming that certification, glazing, seals, hardware, and installation details all align with the exact arched configuration.

For projects that require a premium steel-framed solution—whether a single statement arch or a coordinated set of steel doors, steel windows, and partitions—exploring a bespoke approach early helps protect design intent and reduce compliance risk. Portamet’s team can support enquiries with technical guidance and made-to-order steel fabrication for UK, European, and USA-bound projects through a coordinated export process.

Explore bespoke options, request a quote, or share drawings for review to confirm feasibility, sightlines, and performance requirements before finalising the specification.