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A Typical Mezzanine Floor Layout

The illustration below shows a typical mezzanine floor layout.
Please Note: You can roll your mouse over each of the red dots to reveal additional information.

Structural Steel Mezzanine Floors

Structural steel mezzanine floors are used for applications varying from Storage to Light Assembly & Office uses. They effectively capitalise on the cubic volume of a building freeing-up ground floor areas.

The structures are manufactured to suit individual requirements and Local Authority Building Regulation compliance, and are delivered to site pre-fabricated enabling rapid on-site installation. A further benefit of being pre-fabricated is the ability to take down & relocate the structure at a later date.

Click here to view mezzanine underside


Compliant with Building Regulations Part 'K' - Standard 900mm width treads ( option Part 'M' ambulent Disabled stairs as required to suit layouts). Click the red dot for more details...

Stair Treads

Durbar chequerplate folded steel stair treads.

Column Cladding

Optional 1hr fire resistant column cladding in galvanised or PVC finish. A requirement when mezzanine is for office use, if the General Public are to use mezzanine or when floor area exceeds 50% of building envelope.

Base Plates

Typically 300x300x12mm Mild steel plate secured to the floor with typically M12 bolts/sleeve anchors. Actual Size is dictated by height and usage of floor & local slab & ground conditions.


Rectangular Hollow Section (RHS), can vary in size from 80 x 80mm to 180 x 180mm for larger spans Typically 100x100mm RHS.

Load Protection Plate

As an option a 3mm thick painted steel Durbar Chequer-plate protection plate is provided @ 1.2m x 1.2m x 4.5mm (thickness) with a 150mm downstand to front. This then protects chipboard decking & fascia from forklift & pallet impact.


1hr fire resistant stairwell enclosure (where a protected means of escape is required) from first floor through to final ground floor exit. Constructed from double layer 12.5mm plasterboard onto metal stud framework (varying section thickness to suit heights ranging from 100mm to 198mm overall thickness walling).

Loading Gate

Counter balanced 'roll over' safety loading gate (pallets only accessible on mezzanine once gate closed to exposed edge). Sliding 'telescopic' or 'hinged gate' options available. Steel Chequer-plate protection plate to deck level optional with downstand to edge to protect decking & fascia.

Fire Door

1981mm x 838mm x 44mm FD30SC solid core fire door module fitted with intumescent fire & smoke seals plus overhead mechanical closer.


38mm High Density Particle Board (TG2, Grade C, Type P6) fixed to decking joists with self drilling 'Tek' screws. Also available in moisture resistant and non-slip grey finish. Open steel mesh options available (often when sprinklers are in building).


Hand and knee guarding (Building Regulations Park K compliant) to 1100mm high with galvanised 1" normal bore steel tube into RHS Post at 1.5m centres with baseplate bolted through to decking to beam or joists. Kick board using 150mm high steel if required to preclude falling objects from edges.


Top landing supported on tower below.


Flat steel @ 150 x 3mm high steel kicker to stop objects rolling over edge.

Secondary Beam

Galvanised 'C' section cold rolled decking joist typically 165mm deep/high x 1.5mm thickness (it is their 'C' shape which provides strength) - provided generally at 600mm centre to suit decking board joints. These joists are cleated into side flange of Main Beam at either end in an 'inset' design. Sometimes provided on top of main beams in an 'over the top' configuration. These joists are tied in pairs at mid span position to preclude twisting using threaded rod.

Mid Span Ties

Threaded rod 'mid span' tie bars.

Main Beam

Hot Rolled Beam sometimes known as 'I' beam, UB or RSJ. Typically 254mm x 102mm to 356mm deep/high.

Suspended Ceiling

1hr Fire resistant suspended ceiling grid & tiles supported on wire to decking joists. A requirement when mezzanine is for office use, if the General Public are to use mezzanine or when floor area exceeds 50% of building envelope


1hr fire resistant fascia in galvanised or PVC finish to exposed edges (where fire protection is required) to conceal void between top & underside where not bounded by perimeter walls.

Cross Bracing

Diagonal cross bracing using 50 x 50 x 6mm RSA (steel angle) as required by engineers to provide lateral stability to structure.

Strut Brace

As an alternative option to cross-bracing a diagonal strut brace is sometimes provided using 50 x 50 x 3mm steel angle bolted between top of column & through footplate into floor.


Website last updated 24th May 2018