Slab System

When designing buildings such as offices, shopping centers, and car parks, three floor systems are most commonly used: the flat plate, the flat slab, and the banded slab.

For high-rise projects, a fourth solution is also frequently implemented, which utilizes band beams at close spacing, spanning from the building’s perimeter to the service core.

While the cost-efficiency of each system depends on the specific span and load requirements, there is a general rule for cost comparison. Typically, a band beam design is the most economical, followed by the flat slab and then the flat plate.

The Flat Plate system is a simple and cost-effective solution for residential high-rise construction. It features a smooth, flat underside (flush soffit) that requires minimal formwork and helps speed up the construction process.

Slab thickness is usually based on shear requirements, but column capitals or shear heads can be added to allow thinner slabs or longer spans. The system works best in layouts with equal spans in both directions.

The Flat Slab system enhances the performance of a standard flat plate by incorporating "drop panels" around the columns. This allows the floor to handle loads better and support longer spans.

By enabling thinner floor profiles, this system helps reduce overall building height, which leads to substantial cost savings on installation. It is an ideal choice for projects where spans are consistent in both directions and structural efficiency is a priority.

This system is ideal for structures where spans are predominant in one direction. By using a wide, shallow "band beam" cross-section, the design significantly reduces overall floor depth while supporting longer spans.

Designed for efficiency, this system simplifies formwork and creates space for building services. The straight tendons allow faster installation and shorter construction time.

A popular choice for modern high-rise construction, this system uses band beams placed at close intervals from the perimeter to the service core.

Its uniform layout allows easy formwork reuse and speeds up construction. Services can run below the bands, while post-tensioning helps achieve longer spans and reduce beam load.