Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A drop beam is deeper than the slab, so part of it shows below the ceiling, unlike a hidden beam that sits within the slab depth. It carries larger spans and loads with less steel.
Why it matters on a project
It is structurally economical but affects ceiling height, lighting layout and duct routes, so architect, structural and mechanical engineers agree on it before the drawing is approved.
Measurement and pricing
Concrete in cubic metres, steel in tonnes, and formwork in square metres for the sides and soffit.
Common mistake
Placing a drop beam across the middle of a hall without coordination, then hiding it with a false ceiling that lowers the whole hall.
Frequently asked questions
Drop beam or hidden beam?
A drop beam uses less steel and spans further; a hidden beam gives a flat ceiling at a higher steel cost.
Can a drop beam be hidden?
With a false ceiling or by placing it along room edges, agreed during design.
Related terms
- BeamA horizontal element that carries the slab and transfers its loads to the columns.
- Hidden beamA beam within the slab depth so it does not show below the ceiling.
- Floor-to-floor heightThe distance from one floor level to the floor level above.
- Clash detectionChecking models to find where disciplines collide before construction.
Read next
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