Composite slabs are a popular option in construction, combining the benefits of both concrete and steel to create a strong, durable and efficient flooring system. This type of slab consists of a steel deck with a concrete topping, providing a high-strength and lightweight solution that is ideal for multi-storey buildings, car parks, and industrial structures. In this step-by-step guide, we will discuss how to install composite slabs to ensure a successful and efficient construction process.

Step 1: Prepare the Decking

Before installing composite slabs, it is important to prepare the decking. The steel decking should be clean, free from any debris or rust, and should be checked for any damage. Any damaged or corroded areas should be repaired or replaced before the installation process begins. The decking should also be levelled and aligned properly.

Step 2: Install the Edge Trim

The next step is to install the edge trim. This is an important part of the composite slab system and will help to ensure a stable and secure installation. The edge trim should be installed around the perimeter of the steel decking, providing a barrier to prevent the concrete from spilling over the edges during pouring. The edge trim should also be installed at any penetrations in the decking, such as pipes or ducts.

Step 3: Install the Shear Stud Connectors

The shear stud connectors are used to connect the steel decking to the concrete topping. These connectors should be spaced evenly across the decking, usually at 600mm intervals, and should be installed in accordance with the manufacturer’s instructions. The connectors should be welded securely to the steel decking to ensure a strong connection.

Step 4: Lay the Reinforcement Mesh

The next step is to lay the reinforcement mesh. This is typically a welded wire mesh or a steel fabric that is laid on top of the steel decking. The reinforcement mesh should be cut to the appropriate size and shape and should be positioned to ensure that it covers the entire area of the slab. The mesh should also be properly supported to prevent it from sagging during the pouring process.

Step 5: Pour the Concrete Topping

Once the reinforcement mesh is in place, the concrete topping can be poured. It is important to use a concrete mix that is suitable for composite slabs, as this will help to ensure a strong and durable finished product. The concrete should be poured evenly across the entire area of the slab, taking care not to overfill the edge trim. The concrete should also be properly consolidated to ensure that there are no air pockets or voids in the finished product.

Step 6: Finish the Surface

Once the concrete has been poured, it should be finished to achieve the desired surface finish. This can be done using a trowel or a float, depending on the finish that is required. It is important to ensure that the surface is level and smooth, and that any joints or penetrations are properly sealed.

Step 7: Allow the Slab to Cure

After the concrete topping has been poured, it is important to allow the slab to cure properly. This typically takes around 28 days, depending on the environmental conditions. During this time, it is important to ensure that the slab is properly protected from the elements and that it is not subjected to any heavy loads or traffic.

Step 8: Install the Finishing Materials

Once the slab has cured, the finishing materials can be installed. This may include floor coverings, such as carpet or tiles, or other finishing materials, such as paint or wallpaper. It is important to ensure that the finishing materials are suitable for use with composite slabs and. That they are properly installed to ensure a long-lasting and attractive finished product.


Installing a composite slab can be a complex process, but it is an important step in many construction projects. By following these steps and working with a qualified contractor. It is possible to create a strong and durable slab that will provide a solid foundation for any building or structure. Whether you are building a new home, a commercial building, or a bridge. A composite slab can provide the strength and stability that you need to get the job done right.

sui gas bill