ComFlor 46 (CF46) Composite Floor Decking

ComFlor 46 (CF46) is the original composite floor decking profile that established the UK market. First introduced in the 1980s, it remains widely specified today thanks to its simplicity, cost-efficiency, and fast installation. For projects where speed, ease of handling, and predictable performance are key, ComFlor 46 continues to be a reliable and proven choice.

With a 900mm cover width — 50% wider than standard 600mm profiles — ComFlor 46 allows more floor area to be installed per sheet. This reduces the number of joints, accelerates installation, and lowers overall labour costs on site. The profile’s lightweight and nestable design also improves transport efficiency, allowing more square metres per delivery and reducing logistics costs.

ComFlor 46 is particularly well suited to projects with tight programmes, constrained site access, or cost-driven specifications, where simplicity and speed take priority over longer span capability. With straightforward fire design requirements and no complex detailing, it provides a practical, no-nonsense solution for commercial and industrial applications.

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ComFlor 46 prices start from £15/m² (supply only)

ComFlor 46(CF46) Key Benefits

• 46mm deep trapezoidal profile, 900mm cover width for fast floor coverage
• Nestable profile shape stacks tightly for low transport cost and more m² per delivery
• As simple and quick to install as a roof deck, with no specialist laying requirements
• Wide 900mm cover reduces joint lines and installation time per m²
• Economical concrete usage: lower cost compared to re-entrant profiles at equivalent slab depths
• Available in 0.9mm and 1.2mm gauges in S280 grade steel
• Designed to British Standard values, making initial checks straightforward
• Suitable for export and difficult access sites: more floor area fits per container or lorry
• CE certified

ComFlor 46(CF46) Profile Specification

• Profile depth: 46mm
• Cover width: 900mm
• Pitch: 225mm
• Crown width: 67mm
• Valley width: 105mm
• Available gauges: 0.9mm, 1.2mm
• Steel grade: S280 (Galvatite Z275)

Section properties conform to BS 5950. Design and load/span tables are to British Standard values. ComFlor 9 software supports British Standard design for ComFlor 46.

Sectional Properties

Section properties conform to BS 5950. Source: ComFlor 46 product datasheet.

Panel Weight Reference

Approximate weight of a single ComFlor 46 sheet at 3 metres length and 900mm cover width (panel area = 2.70 m²). The wide cover means each sheet represents significantly more floor area than a 600mm profile. At 0.9mm gauge the sheet weight per m² is the lowest in the ComFlor range at 9.2 kg/m², though the larger panel size means each individual sheet is slightly heavier than a 600mm profile sheet of the same length.

Safe manual handling procedures must be applied for both gauges. At 1.2mm, mechanical assistance should be assessed by the site team.

Concrete Volume per m²

British Standard density values: normal weight concrete (NWC) wet 2,400 kg/m³, dry 2,350 kg/m³; lightweight concrete (LWC) wet 1,900 kg/m³, dry 1,800 kg/m³. Deck and mesh weight not included. Ponding allowance not included. Source: ComFlor 46 datasheet (British Standard values).

Fire Performance

Fire design for ComFlor 46 is carried out to British Standard, using the Bar Fire Method. An important distinction for this profile is that the unpropped span tables do not include fire resistance: for fire-rated applications, propped construction is the standard design approach for ComFlor 46. The indicative minimum slab depths below are for propped construction with normal weight concrete and bar reinforcement.

Indicative values for propped construction with bar reinforcement (Bar Fire Method), British Standard design, NWC and LWC, beam width 152mm. Unpropped span tables for ComFlor 46 do not include fire resistance. Actual minimum slab depths depend on span, applied load, and gauge. Always verify against project-specific span and fire tables. Contact our team to confirm requirements for your project.

Why Specify ComFlor 46?

ComFlor 46 has been in continuous production since the early 1980s because its advantages are real and consistent across a wide range of project types. The case for specifying it starts with logistics and installation, not structural performance, and that is where it genuinely excels over more complex profiles.

The 900mm cover width means a single ComFlor 46 sheet covers the same floor area as one and a half sheets of a 600mm profile. On a project where the deck installation rate is driven by the number of sheets that need to be moved, positioned, and fixed, that 50% reduction in sheet count goes directly into programme efficiency. The flat installation pitch, comparable to laying roof deck, means operatives can maintain a fast, consistent pace without the precision alignment that some deeper or more complex profiles require around bearer positions and trough centres.

The nestable geometry compounds the logistics advantage. Sheets pack tightly into bundles because each profile sits directly inside the next. Where 600mm profiles ship at a certain density per lorry, nestable 900mm profiles ship at a higher m² density per load. On a large project with multiple deliveries, that matters to the programme and to the haulage budget. On an export project where freight cost is calculated per container, it matters even more. ComFlor 46 was the standard ComFlor profile supplied to international projects for decades, and that heritage is based on exactly this characteristic.

The concrete volume figures are also competitive. At 120mm total depth, ComFlor 46 requires 0.101 m³/m² of concrete. The simple trapezoidal trough displaces a meaningful volume of concrete relative to a solid slab, keeping pour weights manageable on lightly loaded structures. For refurbishment projects where the existing frame has limited additional capacity, or for mezzanine and extension work where foundation loading needs to be minimised, the relatively light slab is a genuine structural benefit.

The S280 British Standard specification also keeps the structural design process straightforward for the scale of project ComFlor 46 typically serves. There is no Eurocode software requirement for initial design checks, and the span tables are clear and direct to apply. For a smaller contractor or a structural engineer carrying out a quick feasibility check, that simplicity has practical value.

Typical Applications

• Smaller commercial and residential projects where the structural demands are straightforward and programme and cost efficiency are the primary drivers
• Refurbishment and extension work on existing steel-framed buildings, particularly where slab weight and cranage must be minimised
• Mezzanine floors and industrial extensions where a simple, economical composite slab is required
• Export projects and difficult access sites where logistics efficiency, nestable transport, and maximum m² per delivery are important
• Sites where crane availability is restricted and a lightweight, wide-coverage deck reduces the number of lifts required

Compliance and Standards

• Section properties conform to BS 5950
• Load and span tables to British Standard; ComFlor 9 software supports British Standard design for ComFlor 46
• Fire design by Bar Fire Method to British Standard
• Deck material to BS EN 10346 S280GD+Z275
• Anti-crack mesh requirements to BS EN 1994-1-1 Clause 9.8.1(2): minimum 0.1% of concrete section for unpropped, 0.2% for propped
• CE certified
• Supplied in accordance with the BCSA Code of Practice for metal decking and stud welding

Why Choose RMD Profiles?

Since 2009, RMD Profiles has supported thousands of UK contractors, engineers, and developers with dependable roof and floor decking systems. We combine a wide stocked product range with genuine technical expertise, fast-track supply, and a level of service that keeps projects moving.

• One of the widest stocked ranges of structural decking in the UK
• Exclusive Buy Back Scheme for surplus materials
• Certified stud welding and edge trim expertise, in line with BCSA and SCI guidelines
• Fast-track supply with 24-hour delivery available on stocked lines (subject to stock)
• Trusted partner on over 10,000 UK projects, from hospitals to high-rises

Further Reading and Guidance

• Composite Floor Decking in the UK: Clear Choices, Faster Floors
  A practical overview of how composite floor decks are selected for UK projects. Covers the differences between trapezoidal and re-entrant profiles, how span and fire requirements influence profile choice, and when simpler, wider profiles like ComFlor 46 have a clear advantage over more complex alternatives.
• The Many Uses of Edge Trim in Metal Deck Construction
  A guide covering the different types of edge trim used in metal deck construction, their applications at slab edges, construction joints, and around openings. Relevant to ComFlor 46 installations, particularly on refurbishment and extension projects where edge details must integrate with existing structure.

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