Mezzanine Floors & Steel Structures

A steel mezzanine is a structural steel floor, platform or multi-level structure built inside a factory, warehouse, showroom or existing building to add usable floor area. Its design turns on the load case for its actual use under IS 875 Part 2, the capacity of the existing slab under its columns, and escape routes under NBC 2016 Part 4.

By Dhruv Agarwal · · 1 min read

What we deliver

Steel mezzanine floors, platforms, walkways, staircases and multi-level steel structures for factories, warehouses, showrooms and commercial buildings — designed, fabricated and erected, including in existing buildings.

A mezzanine is the fastest way to get more usable floor inside an existing building. It is also a structure that people and goods stand on, which makes the load case and the escape route the two things to get right before anything else.

Scope of works

StageWhat we deliver
AssessmentExisting slab capacity, clear heights, access
DesignBeams, columns, bracing and decking to IS 800
Load caseOffice, storage or racking loads per IS 875 Pt 2
FabricationSteel members, shop-primed
ErectionColumns, beams, decking, handrails
AccessStaircases, handrails, edge protection
FinishingDeck surface, fire protection where required

Where projects go wrong

  • Designed for office load, used for storage. A common and dangerous mismatch.
  • Existing slab not checked. Mezzanine columns bring concentrated loads down onto a floor that was not designed for them.
  • Escape routes not considered. Added floor area needs exits.
  • Clearances overlooked. Headroom under and over the mezzanine, and around services and sprinklers.
  • No edge protection. Open edges need handrails and toe boards.

Why Hagerstone

Structural steel fabricated and erected in-house with 15 welders and 15 fitters, and the civil, MEP and fire teams to handle the slab checks, services and escape routes a mezzanine brings with it.

Work at height, lifting and equipment safety covered under our HSE system, with ISO 9001 / 14001 / 45001 and 79+ quality checkpoints.

Standards referenced

Steel design to IS 800:2007. Imposed loads to IS 875 (Part 2). Means of egress under NBC 2016, Part 4.

Standards referenced

  • IS 800:2007 — General construction in steel — code of practice (Bureau of Indian Standards)
  • IS 875 (Part 2) — Imposed loads (Bureau of Indian Standards)
  • NBC 2016, Part 4 — Fire and life safety — means of egress (Bureau of Indian Standards)

Frequently asked

Often, yes — that is one of the main reasons mezzanines are used. It needs the existing floor slab checked for the new column loads, clearance under and over the mezzanine confirmed, and the fire and escape implications of the added floor area assessed. A mezzanine that works structurally can still fail on escape routes.

It depends entirely on use — an office mezzanine, a storage mezzanine and one carrying racking are very different cases under IS 875 Part 2. Storage and racking loads in particular are high and concentrated. Designing for a light office load and then using it for storage is a common and dangerous mistake.

Depending on its size and occupancy, it can. Added floor area adds occupants and travel distance, and NBC 2016 Part 4 governs exits from it. This should be settled with the design, since a staircase is far easier to plan in than to add afterwards.

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