Steel Decking Guide
Steel decking is a high-performance solution used in composite concrete floors and structural roof systems. With over 25 years’ experience, RMD Profiles helps contractors and developers select the right metal decking profiles for a wide range of project requirements.
This guide covers everything you need to know — from understanding how composite metal decking works to choosing the right profile based on span, load, and fire performance.
You’ll also learn about Metfloor profiles, their advantages, and how steel decking systems are used across residential and commercial construction projects.
Whether you’re at design stage or ready to build, this guide will help you make informed decisions and achieve the best outcome for your project.
What is Steel Decking?
Steel decking is a galvanised steel sheet system used in the construction of composite concrete floor slabs and structural roof decks.
In composite applications, it works together with concrete and shear studs to create a strong, load-bearing floor system. It can also be used as sacrificial formwork, acting as a permanent shutter to support reinforced concrete slabs during pouring.
It is widely used across residential, commercial, and industrial construction due to its strength, efficiency, and ease of installation.
Types of Steel Decking Systems
Composite Steel Decking
Is designed to work with concrete to form a structural floor system. Shear connectors bond the concrete to the steel frame, improving load performance and reducing overall steel requirements.
Sacrificial Formwork Decking
This type of decking acts as permanent shuttering for concrete but does not contribute structurally. It is commonly used where speed and simplicity are key.
Roof Decking Systems
Roof decking uses simpler profile designs and can be overlapped to achieve longer spans. It is typically used beneath insulation and waterproofing systems
Choosing the Right Metal Decking Profile
Selecting the correct metal decking profile is essential for structural performance and efficiency.
Key factors to consider include:
- Span widths and support spacing
- Load requirements and structural design
- Fire performance ratings
- Profile type and slab depth
Choosing the right system early in the design process helps avoid costly changes later.
Composite Metal Decking Profiles (Metfloor & Tata)
A wide range of composite metal decking profiles are available to suit different project requirements. These range from our Metfloor range to our Comflor range.
Metfloor profiles are widely used across the UK due to their performance, flexibility, and compliance with structural standards. Tata and Arcelor roof and floor decking systems also provide reliable solutions for various applications.
Many modern profiles include engineered end details designed to reduce grout loss during the concrete pour, improving efficiency on site.
Steel Decking Supply & Installation (RMD Profiles)
RMD Profiles provides a complete range of steel decking services across the UK.
Our services include:
- Supply only
- Design and supply packages
- Full installation services
- Edge trims and flashings
- Scaffold edge protection and fall arrest systems
- Concrete coordination
We offer flexible solutions tailored to your project requirements, whether you need supply-only or a full supply and install package.
Why Choose an Approved Steel Decking Contractor?
Choosing an approved contractor ensures quality, compliance, and performance.
RMD Profiles delivers:
- Project-specific design calculations
- Compliance with industry standards and regulations
- Proven installation methods
- Reliable supply and lead times
This ensures your steel decking system performs as intended and meets all structural and safety requirements.
Steel Decking FAQs
What types of steel decking are available?
There are two main types of steel decking used in construction:
- Composite decking, which works structurally with concrete
- Sacrificial formwork decking, which acts as permanent shuttering
In addition, roof decking systems are available in a range of profiles and gauges depending on span and design requirements.
Conclusion
Steel decking plays a critical role in modern construction, providing efficient, reliable solutions for both floor and roof systems.
From selecting the right profile to ensuring structural performance, early design decisions make a significant impact on project success.
For expert advice, fast UK supply, and tailored steel decking solutions, RMD Profiles is here to support your project from concept through to completion.
Typically our lead times for supply only are within 24-36hrs https://page.rmdp.co.uk/Home and browse the services tab to explore the flexibility we can offer. And see the choices of profiles we can offer to.
