Re-entrant 51 (R51)
600mm cover width
PLAIN Galvanised as standard, or MAGNELIS OR COLOURCOAT FD finishes available on request for aggressive environments.
Nationwide delivery
24 hour delivery
24 hour support
PLAIN OR COLOURCOAT
R51 - Holorib Type profile
The R51+ can achieve spans of up to 3.6 metres, depending on the concrete depth and load requirements. This minimises the need for intermediate supports, reducing construction time and material costs.
Now available in both S350 and S450 grade steel. It is the go-to profile for inner-city multi-storey projects where controlling structural zone depth and overall storey height is a primary design consideration.
The re-entrant geometry delivers a virtually flat soffit and achieves a 1-hour fire rating with a minimum slab depth of just 102mm in normal-weight concrete. That is among the lowest of any composite steel deck on the market, and it is what makes R51+ the profile of choice when fire performance must be achieved within a tightly constrained floor build-up.
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Watch this short video for a quick explanation!
Optimised Concrete Usage:
The trough design of the R51 reduces the volume of concrete required, offering significant cost savings and lowering the overall slab weight. This results in a more efficient structural design.
Fire Resistance:
The profile can achieve fire ratings of up to 120 minutes, ensuring compliance with building regulations and enhancing safety for occupants.
Acoustic Performance:
The profile offers excellent noise insulation, ideal for residential and office environments. Additional acoustic treatments can further improve sound absorption and transmission reduction.
Logistics and Installation
Efficiency: Each arctic load can deliver approximately 800–900 m² of decking, optimising transport efficiency and minimising on-site storage needs. The lightweight panels simplify handling and speed up installation.
The virtually flat soffit simplifies suspended ceiling installation and gives maximum flexibility for service routing above the ceiling void. The 150mm trough spacing provides good options for shear stud placement, and the re-entrant geometry creates a strong mechanical key into the concrete that performs well in composite beam design.
Concrete Depth Flexibility:
R51 supports a range of concrete depths, typically from 100 mm to 200 mm, making it adaptable to various project specifications and load requirements.
Applications and Aesthetic Flexibility
The R51 profile is well-suited for projects requiring efficient floor systems with a sleek finish. Its underside can be left exposed to create a clean, industrial aesthetic or customised with a suspended ceiling for a more refined appearance. This versatility makes it an excellent choice for modern architectural designs.
Compliance with Design Codes and Standards (see technical).
DESIGNED FOR
REFRUBS AND SMALL PROJECTS
Features
Profile Specification
Profile depth: 52mm
Cover width: 600mm
Trough spacing: 150mm
Available gauges: 0.8mm, 0.9mm, 1.0mm, 1.2mm
Steel grades: S350, S450
Section properties are calculated with supporting testing in accordance with Eurocode 3.
Benefits
52mm deep re-entrant profile, 600mm cover width, virtually flat soffit
102mm minimum slab depth achieves a 1-hour fire rating with normal weight concrete
Available in 0.8mm, 0.9mm, 1.0mm, and 1.2mm gauges in S350 and S450
Optimised profile geometry maximises the structural efficiency of the steel section
150mm trough spacings provide flexibility for shear stud placement
Greater than 85% beam coverage in line with SCI P375, typically removing the need for fire protection to the supporting beam top flange
Soffit wedge nut fixings available with load capacity up to 2kN, the highest in the RMD Profiles floor deck range
Dense concrete section provides excellent acoustic performance, ideal for residential and mixed-use schemes
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
Applications
Inner-city multi-storey residential schemes where storey height is tightly controlled
Student accommodation and build-to-rent developments with acoustic performance requirements
Refurbishment projects where additional floor depth must be kept to a minimum
Mixed-use schemes where a 2-hour fire rating must be achieved from the thinnest practical slab
Any project where acoustic performance and fire resistance from a shallow floor build-up are both design priorities.
TECHNICAL SPECIFICATION
Technical
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
Galvanised Z275 — standard coating, suitable for most internal applications
High durability ZM310 — enhanced zinc-magnesium coating for more demanding environments
TAB-Deck fibre concrete — available as an alternative to fabric mesh, simplifying site reinforcement operations.
For more information, please download our datasheet or click here.
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Why Industry Leaders choose RMD Profiles
Faster installation times.
Lower overall construction costs. Outstanding 24 Hour support.
Comprehensive technical support. Design Support & Service
9 Gaol Lane, Sudbury, Suffolk, CO10 1JL
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