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Mezzanine Floor Design

Mezzanine Floor Design

Ideally buildings with eaves heights at around 6m or more provide the ideal opportunity to double your floor area by installing a mezzanine floor.

Mezzanine Floor Design Assumptions

Our quotation calculator assumes Standard Design Loading of;

4.8 kN/m² (100lbs/sq.ft) UDL-  Imposed Load
0.40 kN/m² UDL – Dead Load
0.15 kN/m² UDL – Service Load (ceilings etc…)

Minimum Characteristic Imposed Loads     
Workroom (without storage)
Canteens (but not kitchens)
Uniformly distributed
Proprietary lightweight partition
Concentrated load
Light storage Uniformly distributed
Concentrated load
Medium storage Uniformly distributed
Hand Pallett truck
Concentrated load
Heavy storage Uniformly distributed
Powered pallet trucks
Concentrated load
Note: The application of the concentrated load shall be in accordance with cl. 5.1.3 of BS6399: Part 1The assumed area of the concentrated load shall be recorded in the Management Document

  • Topside decking – 38mm P6 “C” Grade HDPB (Class `O` – non fire resisting)
  • Steelwork designed as `Inset beam construction` (ie decking joists cleated into side flange of universal main beam to minimise floor section thickness).
  • Standard Paint Finish (most BS or RAL options available at extra cost) otherwise allowed as RAL 5010 Blue Gloss (single coat hand roller applied to non blasted steelwork)

Stair Design

Careful consideration must be given to mezzanine staircase design. Please view the following section for full details: Mezzanine Staircases

Exposed Perimeter Protection

To every edge of mezzanine which is not going to abut the building perimeter walls – Edge protection is required. This is provided by an 1100mm high hand & knee guardrail (50mm dia. Galvanised tube rail) supported between RHS or CHS upright columns with welded footplates at 1100mm centres. We offer an option to provide a 150mm high 5mm thick steel kicker to front edge of handrail posts to preclude falling objects rolling over the exposed edge of mezzanine. All guard-railing is designed & compliant with Building Regulations Approved Document K.

Fire Protection

Generally all mezzanines used for either Light Assembly or Office use (ie anything other than storage & where personnel are using) require the provision of Fire Protection to the entire underside of structure in the form of fire rated Suspended Ceiling, Column cladding to all upright columns & fascia/bulkhead to exposed perimeter edges. Our 600x1200mm ceiling grid & tiles are installed generally 75mm below underside of lowest steelwork. Tiles are white fissured pattern (non-clipped). Column cladding is assumed in our calculator as galvanised face. White PVC faced options available (suitable when offices below mezzanine). Fascia bulkhead similarly is allowed standard as galvanised but also available in white PVC facing.