Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A beam is a horizontal structural element that carries slabs and walls and transfers their loads to columns. It may be a downstand below the slab or hidden within the slab depth.
Why it matters on a project
A downstand beam's depth sets clear height and AC routes beneath it, so it is coordinated with architecture and MEP early.
Measurement and pricing
Concrete in cubic metres, rebar in tonnes, formwork in square metres.
Worked example
A 0.25 × 0.60 m beam 5.0 m long: volume = 0.25 × 0.60 × 5.0 = 0.75 m³.
Common mistake
Coring holes through a beam for pipes after the pour without design, weakening the element.
Frequently asked questions
What is the difference between a downstand and a hidden beam?
A downstand projects below the slab and is deeper; a hidden beam is within the slab depth and usually wider.
Is beam volume counted twice with the slab?
No. Only the part below the slab is counted when the slab is taken in full, per the method of measurement.
Related terms
- ColumnA vertical element that carries slab and beam loads down to the footings.
- Solid slabA concrete slab of uniform thickness without voids, common for small and medium spans.
- SectionA drawing showing the building as if cut vertically to reveal floors, heights and internal details.
- Suspended (false) ceilingA secondary ceiling hung below the structural slab to conceal services and improve acoustics and lighting.
Read next
- Work out quantities with our free calculators: concrete, tiles, paint and plaster. Open the calculators
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