This paper presents an analytical model focusing on how hollowcore slabs, commonly used in construction, interact with cast-in-place concrete toppings. Specifically, it examines the shear transfer between the slab and the topping. The researchers performed tests to evaluate how the roughened surface of the hollowcore slab allows both materials to act together as a composite unit. Furthermore, they developed a mathematical model to predict the interface’s behaviour, particularly the shear and peel stresses. They also validated it using experimental data. These findings help engineers improve composite slab systems by better understanding their load-bearing capacity and behaviour under various conditions. As a result, the model provides a valuable tool for optimizing designs, ensuring that these slabs perform effectively in structural applications.