Comparing Concrete and Metal Deck Steel in Structural Floor Construction: An In-depth Analysis

In the world of structural floor construction, the debate between concrete-based methods and metal deck/steel methods is critical. This article provides an objective comparison based on practicality, time efficiency, structural integrity, and cost. 

With the market widening its exposure to new products coming into the market now, the choice and flexibility is mind-blowing for the construction companies and individual self builders or developers. 

I am biased of course,  but there’s good reason for that, for the last 20 plus years I’ve heard the grumbles, and witnessed the delays on sites from using traditional joist, timber or concrete pre-cast beam and blocks and consistently wonder why people bother with anything else! 

But in truth, like everything there are advantages and disadvantages of anything.

 

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Concrete-Based Methods: Traditional and Reliable

Advantages:

• Durability: Concrete offers remarkable longevity and resistance to wear, essential for long-term structural integrity.
• Fire Resistance: Superior fire resistance makes concrete a safe choice in various building types.
• Sound Insulation: Effective in reducing sound transmission, beneficial in multi-storey buildings.

Disadvantages:

• Time: The curing process of concrete is time-intensive, potentially delaying project timelines before the planks/beams leave the factory. It takes longer to install and your reliant on cranes to load out all components, making it an average of 100m2 per day installed
• Weight: The substantial weight of concrete demands strong foundational support, impacting design considerations in high-rise structures.
• Flexibility: Once set, concrete is challenging to modify, limiting design alterations post-construction.  No room for error, which can be costly if you have to take a beam or block back to factory and re-do.

 

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Metal Deck & concrete/timber structure/Steel Methods: Efficient and Versatile

Advantages:

• Speed of Installation: These methods allow for rapid construction, significantly reducing project timelines by upto 50%- e.g between 200m2 – 400m2 can be installed in one day

 

• Strength-to-Weight Ratio: High strength with lighter weight enhances design flexibility, especially in high-rise construction. But more so nowadays in commercial and domestic properties, making for lighter foundations 

 

• Design Versatility: Accommodates contemporary architectural designs with greater ease than traditional concrete.  Its easier to adapt decking to post construction design changes and cut sheets around obstruction on site ideal for renovations, or new builds. The fire, acoustic and durability are enhanced by the solid nature of steel deck, and then concrete is poured onto along with steel fibre or mesh and bar to increase the tension and stability within the slab performance along with the crucial factors important to building regulations.

 

Disadvantages:

• Cost: Generally, steel is more expensive than concrete, impacting the overall budget of a project. However when you fit metal deck to block/timber structures the cost can become a lot more competitive as a direct comparison, and if you consider the whole process and time saved using metal deck on these structures as well as steel you can save a small fortune overall, as well as increasing the speed of the return on your investment

 

• Deflection must be considered in terms of structural support as deck won’t span as far as pre-cast planks – block and beam, although on smaller projects this can be overcome by temporarily propping and using the metal deck as sacrificial formwork, by designing the concrete slab as an RCS independent to the metal deck

 

• Acoustic Performance: Steel can transmit sound more than concrete, potentially necessitating additional acoustic treatment. However this can be overcome by using a high density concrete design on the deck, and no gaps appear with metal deck constructed floors like block/beams/timber floors that squeak, and concrete joints come lose over time of use.

 

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Conclusion:

The choice between concrete and steel in floor construction depends on specific project requirements. Concrete is favoured for its durability and safety, while steel is preferred for its speed and flexibility. Cost, environmental factors, and the intended use of the building also play crucial roles in this decision-making process.

Smaller contractors, developers or self builds who care about quality, speed and long term benefits will always choose metal deck slabs as they do offer a resilient, high quality and solid finish….but then I am biased….but it is true!

 

 

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