MetFloor 80 (MF80) Composite Steel Floor Decking
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.
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, enabling wider structural bays and fewer secondary beams across large floor plates.
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
| Nominal thickness | Grade | Profile depth | Neutral axis (mm) | Steel area (mm²/m) | Profile weight (kN/m²) |
|---|---|---|---|---|---|
| 0.9mm | S350 / S450 | 80mm | 46mm | 1,359 | 0.102 |
| 1.0mm | S350 / S450 | 80mm | 46mm | 1,517 | 0.135 |
| 1.2mm | S350 / S450 | 80mm | 46mm | 1,833 | 0.150 |
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).
| Gauge | kg/m² | Approx panel weight (3m sheet) |
|---|---|---|
| 0.9mm | 10.4 | ~19 kg |
| 1.0mm | 13.8 | ~25 kg |
| 1.2mm | 15.3 | ~28 kg |
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.
| Slab depth (mm) | Concrete vol (m³/m²) | Wet NWC (kN/m²) | Dry NWC (kN/m²) |
|---|---|---|---|
| 140 (min) | 0.097 | 2.46 | 2.37 |
| 150 | 0.107 | 2.72 | 2.61 |
| 160 | 0.117 | 2.97 | 2.86 |
| 170 | 0.127 | 3.23 | 3.10 |
| 180 | 0.137 | 3.48 | 3.35 |
| 200 | 0.157 | 3.99 | 3.84 |
| 220 | 0.177 | 4.50 | 4.33 |
| 250 | 0.207 | 5.27 | 5.06 |
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.
| Fire rating | Min slab depth, NWC (fabric mesh) | Min slab depth, NWC (FibreDeck) |
|---|---|---|
| 30 minutes | 140mm | 140mm |
| 60 minutes | 140mm | 140mm |
| 90 minutes | 150mm | 150mm |
| 120 minutes | 160mm | 160mm |
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 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
Need span tables or crushed ends details for MetFloor 80?
Our technical team can provide project-specific span and load tables for both S350 and S450, crushed ends specifications, fire design confirmation, acoustic data, and layout drawings. Use the chat assistant for a fast initial check, or contact us directly.
Call 01787 275055 or email sales@rmdp.co.uk
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.
Not quite what you are looking for? RMD Profiles supplies all the most popular brands of structural metal floor deck, including the full MetFloor, ComFlor, and Firth Steels ranges. Browse the complete floor decking range to find the profile that matches your span, fire rating, and structural requirements. View the full range of floor metal decking
About Composite Floor Decking
Composite floor decking is the backbone of modern steel-frame floor construction. A composite floor deck acts as permanent formwork during the pour and, once the concrete cures, works compositely with the slab and shear studs to form the finished structural floor. This removes temporary shuttering, speeds construction, and produces a lighter floor than a solid reinforced concrete slab.
Composite floor deck profiles range from shallow re-entrant decks to deep trapezoidal profiles. MetFloor 80 is the deepest trapezoidal profile in the MetFloor range, using an 80mm open trough to reach the longest unpropped spans and reduce secondary beam counts on large floor plates. Shallower profiles like MetFloor 60 and MetFloor 55 suit tighter storey heights and shorter spans.
MetFloor 80 is the long-span metal deck for projects where wide structural bays and reduced steel tonnage are the priority, with the crushed ends option removing beam top flange fire protection on qualifying designs. Available in S350 and S450 grades, it lets engineers push span or reduce gauge to suit the structural grid.
Composite floor decking systems like MetFloor 80 are widely specified in multi-storey car parks, large commercial developments and industrial mezzanines across the UK, where span efficiency and structural economy are primary design requirements.
RMD Profiles supplies the full MetFloor, ComFlor and Firth Steels ranges of steel floor decking, backed by technical support and certified stud welding. Whether MetFloor 80 is the right profile or a shallower deck suits your project, our team can confirm the correct system for your span, fire rating and structural requirements to Eurocode standards.
Frequently Asked Questions
What is MetFloor 80 used for?
MetFloor 80 is an 80mm deep trapezoidal composite steel floor deck for long-span applications in commercial and industrial construction, including multi-storey car parks, large commercial offices, industrial mezzanines and warehouse decks. It enables wider structural bays and fewer secondary beams.
What spans can MetFloor 80 achieve?
Unpropped spans in excess of 5.0m are achievable depending on gauge and loading, allowing designers to reduce secondary beam count on large floor plates. Always confirm span and propping against project-specific span tables.
What is the crushed ends benefit on MetFloor 80?
With crushed ends, MetFloor 80 provides up to 85% beam top flange coverage in line with SCI P375, so no additional fire protection is required to the beam top flange on qualifying designs. On long secondary beam runs this is a substantial cost and programme saving.
What fire rating does MetFloor 80 achieve?
With normal weight concrete, a 140mm slab achieves both 30 and 60 minutes, a 150mm slab achieves 90 minutes, and a 160mm slab achieves 120 minutes. Actual slab depth depends on loading and design method.
How much does MetFloor 80 cost?
MetFloor 80 prices start from £16/m² supply only, depending on specification, gauge and order volume. Contact RMD Profiles for a project-specific quote.
Ready to Specify MetFloor 80?
Contact RMD Profiles today to discuss your composite floor decking requirements. Our team provides technical support, span tables for S350 and S450, crushed ends details, and competitive pricing on all MetFloor products.
