MetFloor 80 (MF80) Composite Steel Floor Decking – 600mm Cover Width

MetFloor 80 Composite Steel Floor Decking (MF80)

MetFloor 80 (MF80) steel decking is an 80mm deep trapezoidal composite floor deck designed for projects requiring long spans, fewer beams, and reduced structural costs. Ideal for commercial buildings and large floor plates, it enables wider structural bays while maintaining excellent load performance.

With its deeper profile geometry, MetFloor 80 can achieve unpropped spans in excess of 5.0m (depending on gauge and loading). This allows for a reduction in secondary steelwork while keeping the overall structural load efficient, thanks to reduced concrete volume for equivalent slab depths.

The same crushed ends and beam top flange fire protection benefits found in MetFloor 60 are applied here at a larger scale. When used with crushed ends, MetFloor 80 can provide up to 85% beam top flange coverage (SCI P375 compliant), removing the need for additional fire protection in qualifying designs.

Combined with the ability to reduce beam counts and simplify structural layouts, MetFloor 80 delivers a cost-effective flooring solution that scales efficiently across large commercial developments.

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Metfloor 80  prices start from £16/m² (supply only), depending on specification, gauge, and order volume. 

What is MetFloor 80 (MF80)?

MetFloor 80 is an 80mm deep composite steel floor decking profile designed for long-span applications in commercial and industrial construction. It works in conjunction with concrete to create a high-strength composite slab system.

Key Benefits

• 80mm deep trapezoidal profile, 600mm cover width
• Superior spanning capability: unpropped spans in excess of 5.0m achievable depending on gauge and loading
• Reduced secondary beam count and structural steel tonnage compared with shallower profiles at the same bay width
• Minimum 140mm slab depth for 60-minute fire rating with normal weight concrete
• Crushed ends option enables 85% beam top flange coverage per SCI P375, with potential to remove beam top flange fire protection
• Reduced concrete volume for equivalent slab depths compared with shallower profiles
• Trough stiffeners and side laps positioned for guaranteed central shear stud placement
• No filler blocks required for fire performance with crushed ends option
• Good acoustic performance from the deep trough profile geometry
• Suspended ceilings and services can be attached via Lindapter Type MF decking fixing
• Available in 0.9mm, 1.0mm, and 1.2mm gauges in S350 or S450 grade
• TAB-Deck fibre concrete option available
• Available with enhanced metallic or organic coating systems
• CE and UKCA certified

Profile Specification

• Profile depth: 80mm
• Cover width: 600mm
• Pitch: 300mm
• Crown width: 175mm
• Valley width: 125mm
• Overhang (datum edge): 15mm
• Available gauges: 0.9mm, 1.0mm, 1.2mm
• Steel grades: S350 or S450

Sectional Properties

Source: MetFloor 80 product datasheet, RMD Profiles Technical Manual.

Panel Weight Reference

Approximate weight of a single MetFloor 80 sheet at 3 metres length and 600mm cover width (panel area = 1.80 m²).

Concrete Volume per m²

Concrete density values used in the MetFloor Technical Manual: normal weight concrete wet 2,550 kg/m³, dry 2,450 kg/m³. Deck and mesh weight not included. Ponding allowance not included.

Fire Performance

MetFloor 80 with crushed ends provides 85% beam top flange coverage in line with SCI Publication P375 guidance, with the same beam top flange fire protection benefit as MetFloor 60. On a multi-storey car park or large industrial scheme where the beam layout involves long secondary beam runs, removing the top flange fire protection requirement is a substantial cost and programme saving.

The minimum slab depths below apply to normal weight concrete. FibreDeck slab depths are provided for Eurocode designs; British Standard designs may require increased depths.

Minimum slab depths for normal weight concrete. Source: MetFloor 80 product datasheet, RMD Profiles. FibreDeck slab depths are for Eurocode designs; British Standard designs may require increased depths. Actual minimum slab depths and maximum spans depend on loading, span, and design method. Contact our team to confirm for your specific project.

Why Specify MetFloor 80 Decking?

MetFloor 80 is an 80mm deep composite steel floor decking profile designed for longer spans where 60mm profiles are not sufficient.

The additional deck depth allows wider structural bays, reducing the number of secondary beams required and lowering overall structural costs

On large-scale projects such as multi-storey car parks, MetFloor 80 can span between secondary beams without propping in many standard loading conditions.

This can eliminate entire rows of secondary beams, reducing material costs, connections, crane lifts, and installation time — delivering significant savings across large floor plates.

The crushed ends fire protection benefit is particularly valuable on industrial and car park projects, where beam lengths are longer and exposed surface area is higher.

In many cases, MetFloor 80 decking can eliminate the need for additional fire protection on beam top flanges, reducing both cost and installation time.

The crushed ends fire protection benefit is particularly valuable on industrial and car park projects, where beam lengths are longer and exposed surface area is higher.

In many cases, MetFloor 80 decking can eliminate the need for additional fire protection on beam top flanges, reducing both cost and installation time.

Typical Applications for MetFloor 80 Decking

MetFloor 80 composite floor decking is commonly specified in:

• Multi-storey car parks where long unpropped spans, reduced secondary beam count, and the beam top flange fire protection benefit are all valued
• Large commercial office and mixed-use developments where minimising secondary beam tonnage is a structural value-engineering objective
• Industrial mezzanines and distribution warehouse decks where wide column grids and long spans are required
• Any steel-frame project where unpropped spans beyond the capability of 60mm profiles are required and a 140mm or greater slab suits the fire and structural design

Compliance and Standards

• CE and UKCA certified
• Available in S350 and S450 grades to BS EN 10346
• Crushed ends beam top flange fire protection benefit per SCI Publication P375
• TAB-Deck fibre-reinforced concrete option available
• Enhanced metallic and organic coating options available for aggressive environments
• 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 guide to composite floor deck selection covering profile depth, span, fire rating, and how to choose between MetFloor 80, MetFloor 60, and the ComFlor equivalents for your project requirements.
• The Many Uses of Edge Trim in Metal Deck Construction
  Edge trim selection and detailing for metal deck installations, covering slab edge, construction joint, and fire compartmentation applications.

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