If you work in construction in Saudi Arabia, you have almost certainly seen composite metal deck on a job site — the corrugated steel sheets that form the floor of a multi-storey building before the concrete is poured. But composite decking is more than a mould for wet concrete: once it cures, the steel and concrete work together as a single structural system. Here is how it actually works, and why most modern commercial, industrial and warehouse projects in the Kingdom are built on it.

How Composite Metal Deck Works

A composite metal deck sheet is a galvanized steel panel rolled into a corrugated profile, with small embossments pressed into the ribs. During installation, the deck is fixed across the structural steel beams and acts as permanent formwork — a working platform the crew can pour concrete onto directly, with no timber shuttering to build or strip out afterwards.

Once the concrete is poured, the embossments lock into it as it cures. The steel deck and the concrete slab stop behaving as two separate layers and start behaving as one bonded structural section — a true composite slab. The steel carries the tensile load at the bottom of the slab, and the concrete carries the compressive load at the top, so the combined system is stronger than the steel and the concrete would be on their own. That is also why the deck’s thickness and profile depth are chosen for the actual span and loading of each project, not treated as a one-size-fits-all product.

The Role of Shear Studs

Metal deck bonds the concrete slab to itself — but the slab still needs to be locked to the steel beams underneath it for the floor to act as one composite structure. That is the job of shear studs: headed steel connectors welded through the deck onto the top flange of the beam, to the AWS D1.1 structural welding standard.

Without shear studs, the slab would simply rest on the beam, and the two would flex independently under load. The welded studs transfer horizontal shear force between the beam and the slab, so the beam’s steel and the slab’s concrete share the bending load together. In practice this lets engineers specify lighter, shallower steel beams for the same span — which means less structural steel, lower floor-to-floor heights, and real savings on the overall frame.

The Role of Edge Angles

At the open perimeter of a composite floor — where the deck ends and there is no beam or wall to contain the pour — an L-shaped edge angle is fixed along the edge before concrete is poured. It retains the wet concrete during pouring, stops it leaking over the side, and gives the finished slab a clean, safe edge. It is a small component, but skipping it (or improvising with formwork boards) is one of the most common causes of edge leakage and rework on site.

Why Contractors in Saudi Arabia Choose Composite Decking

• Faster construction: the deck itself is the working platform and the formwork, so there is no timber shuttering to build, wait on, and later strip out — floors go up in a fraction of the time of a conventional cast slab.
• A lighter structure: because the steel deck contributes to the slab’s strength, less concrete is needed for the same load capacity — which reduces dead weight on the beams, columns and foundations below.
• A safer site: once fixed, the deck gives crews a solid, walkable working surface at height, rather than exposed steel beams or temporary formwork.
• Built for the local climate: deck, shear studs and edge angles are manufactured in G90 galvanized steel, chosen for corrosion resistance in Saudi Arabia’s heat and coastal humidity.
• Designed to local standards: profiles are specified to align with Saudi Building Code (SBC) requirements for structural steel decking, and shear stud welding follows the AWS D1.1 standard.

These three components — metal deck, shear studs and edge angles — are usually specified together, because each one solves a different part of the same structural problem: forming the slab, connecting it to the frame, and containing it at the edges. Getting the combination right for a specific span and load is a question for the project’s structural engineer, but the products themselves are stocked and ready to move from our Jeddah warehouse to sites across the Kingdom.