TR80+ Composite Floor Decking
TR80+ is an 80mm deep trapezoidal composite floor deck developed to deliver long unpropped spans while maintaining efficient slab depths and reduced concrete volumes. Originally introduced in 2002, continued research and development has evolved the profile into the TR80+, now widely specified across low to medium rise buildings in the UK.
The deeper 80mm trapezoidal geometry enables excellent unpropped span capacity, reducing the number of secondary beams required and helping to optimise overall structural layouts. Fewer beams means fewer connections, less erection time, and a leaner overall structural scheme.
Key Benefits
- 80mm deep trapezoidal profile, 600mm cover width, for enhanced spanning performance
- Reduced concrete volume compared with shallower composite decks at equivalent slab depths
- Minimum 140mm slab depth achieves a 1-hour fire rating with normal weight concrete
- Excellent unpropped span capability, reducing secondary steelwork and overall steel tonnage
- Trough stiffeners positioned for central shear stud placement, minimising site checking
- Soffit wedge nut fixings available with load capacity up to 1kN
- Acoustic Robust Solution in accordance with Robust Standard Details
- TAB-Deck fibre concrete option available as an alternative to fabric mesh reinforcement
- CE and UKCA certified, section properties to Eurocode 3
Profile Specification
- Profile depth: 80mm
- Overall depth to top re-entrant: 92mm
- Cover width: 600mm
- Available gauges: 0.9mm, 1.0mm, 1.2mm
- Steel grades: S350, S450
Section properties are calculated with supporting testing in accordance with Eurocode 3.
Sectional Properties
| Nominal thickness | Design thickness | Grade | kg/m² | kN/m² | Neutral axis | Steel area (mm²/m) | Inertia (cm&sup4;/m) |
|---|---|---|---|---|---|---|---|
| 0.9mm | 0.86mm | S350 or S450 | 11.33 | 0.111 | 42.3mm | 1,385 | 172.9 |
| 1.0mm | 0.96mm | S350 or S450 | 12.54 | 0.123 | 42.4mm | 1,539 | 192.3 |
| 1.2mm | 1.16mm | S350 or S450 | 15.06 | 0.148 | 42.5mm | 1,860 | 231.1 |
Panel Weight Reference
Approximate weight of a single TR80+ sheet at 3 metres length and 600mm cover width (panel area = 1.80 m²). Use these figures for site handling and lifting planning.
| Gauge | kg/m² | Approx panel weight (3m sheet) |
|---|---|---|
| 0.9mm | 11.33 | ~20 kg |
| 1.0mm | 12.54 | ~23 kg |
| 1.2mm | 15.06 | ~27 kg |
Concrete Volume per m²
Normal weight concrete (NWC). Deck and mesh weight not included. Ponding allowance not included. Source: RMD Profiles TR80+ datasheet.
| Slab depth (mm) | Concrete vol (m³/m²) | Wet weight NWC (kN/m²) | Dry weight NWC (kN/m²) |
|---|---|---|---|
| 140 (min, 60 min fire) | 0.096 | 2.26 | 2.21 |
| 150 | 0.106 | 2.50 | 2.44 |
| 160 (min, 120 min fire) | 0.116 | 2.73 | 2.67 |
| 170 | 0.126 | 2.97 | 2.90 |
| 180 | 0.136 | 3.20 | 3.14 |
| 200 | 0.156 | 3.67 | 3.60 |
| 225 | 0.181 | 4.26 | 4.17 |
| 250 | 0.206 | 4.85 | 4.75 |
Fire Performance
Fire design in accordance with SCI PN005c-GB and BS 5950 Part 8. Minimum slab depths shown are for normal weight concrete (NWC) and lightweight concrete (LWC) with fabric mesh reinforcement. Contact RMD Profiles to confirm requirements for TAB-Deck fibre concrete applications.
| Fire rating | Min slab depth, NWC | Min slab depth, LWC |
|---|---|---|
| 1 hour | 140mm | 130mm |
| 1.5 hours | 150mm | 140mm |
| 2 hours | 160mm | 150mm |
| 3 hours | 175mm | 160mm |
| 4 hours | 200mm | 175mm |
At 1.5-hour and 2-hour fire periods, increased mesh sizing or trough bars may be required depending on span and applied load. Contact our team or use the chat assistant to confirm reinforcement requirements for your specific project.
Finishes and Options
- Galvanised Z275 — standard coating, suitable for most internal applications
- High durability ZM310 — enhanced zinc-magnesium coating for more demanding environments
- Plastisol PF — colour-coated option where soffit aesthetics are required
- Crushed ends — improves fire compartmentation at beam ends and can remove the need for fire protection to the beam top flange
- Low-carbon steel — available for projects with embodied carbon targets
Why Specify TR80+?
TR80+ is the preferred deep trapezoidal profile for design teams targeting a reduction in structural steel tonnage without compromising on fire performance or span capability. The deeper 80mm trough geometry enables longer spans between secondary beams, and fewer beams means fewer connections, less erection time, and a shorter overall programme.
The minimum 140mm slab depth for a 1-hour fire rating is achievable with normal weight concrete and either standard fabric mesh or the TAB-Deck fibre concrete alternative. Central trough stiffener positioning ensures consistent shear stud location without additional site checking, reducing installation time and minimising non-compliance risk.
Lower concrete volumes compared with re-entrant profiles at equivalent slab depths translate directly into reduced wet dead loads, lighter foundations, and lower concrete supply costs.
Case Studies
For examples of how TR80+ and other RMD Profiles products have been used on live projects, visit our Project page.
Typical Applications
- Residential and mixed-use developments, low to medium rise
- Commercial offices where structural zone optimisation is a priority
- Education and healthcare projects with medium storey heights
- Schemes requiring long unpropped spans and a reduced secondary beam count
Compliance and Standards
All RMD Profiles metal decking products are manufactured and supplied in compliance with current UK and European structural codes and best practice guidance:
- Designed to Eurocode EN 1993-1-3 for cold-formed steel sections
- Compliant with BS 5950 Part 6 for profiled sheeting in structural design
- Follows good practice guidance from the Steel Construction Institute (SCI P300)
- 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 (subject to stock)
- Trusted partner on over 10,000 UK projects, from hospitals to high-rises
Need span tables or fire design confirmation for TR80+?
Our technical team can provide project-specific span and load tables, fire design checks, and layout drawings. Use the chat assistant for an instant initial answer, or contact us directly.
Call 01787 275055 or email sales@rmdp.co.uk
Further Reading and Guidance
If you are at an earlier stage of your project or want to understand more about how composite floor decking is selected, specified, and installed, the following resources cover the key topics in plain language. Whether you are comparing profiles, working through a specification, or getting to grips with the finer details of installation, these guides will help you move forward with confidence.
- Composite Floor Decking in the UK: Clear Choices, Faster Floors
A practical overview of composite floor decking in the UK market, covering how profiles are selected, what drives span and fire decisions, and how to match the right product to your project requirements. A useful reference if you are comparing TR60+ against other options in the range or need to explain the choice to a client. - The Many Uses of Edge Trim in Metal Deck Construction
Edge trim is one of the most frequently overlooked elements of a floor deck installation, but it plays a critical role in forming the slab edge, containing wet concrete, and contributing to fire compartmentation. This guide explains the different types available and when each is appropriate, including applications directly relevant to TR60+ installations.
Not quite what you are looking for?
RMD Profiles supplies all the most popular brands of structural metal floor deck on the market, including ComFlor, MetFloor, and the full Firth Steels range. If TR80+ is not the right fit for your project, browse the complete floor decking range to find the profile that works for your span, fire rating, and structural requirements. View the full range of floor metal decking
