A flat slab is a one-way or two-way system with thickenings in the slab at the columns and load bearing walls called ‘drop panels’.
Advantages:
- Simple formwork.
- No beams.
- Minimum structural depth.
- Doesn’t require shear reinforcement.
Disadvantages:
- Medium spans.
- Generally not suitable for supporting brittle (masonry) partitions.
- Drop panels may interfere with larger mechanical ducting.
- Vertical penetrations need to avoid area around columns.
- For reinforced flat slabs, deflection at the middle strip may be critical.
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