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Mezzanine floor

Mezzanine floor strictly in simple terms an intermediate floor in a building, which usually provides an extra  space used for storage, offices or miscellaneous purposes. They are normally added to an existing building where the ground floor space is limited. A steel structure arranged on a grid is probably the most common type of mezzanine floor.  The floor structure is normally made from either timber joists or cold formed steel sections, with a timber decking. 

The floor is in turn supported on steel beams spanning between columns.  Sometimes the columns may be supported on the existing floor slab. However, for high storage loading or where there are wide column spacing, individual foundations will almost always be needed. 

The frame sections need to be adequate enough to resist the lateral forces. For achieving a cheaper design, the columns should be crossed braced if it is possible, otherwise, portalized frames can be used instead.

The design of mezzanine floor is preferred to be independent of the main structure.  This is not only convenient to design, but it also avoids the deflection of the building moving the mezzanine floor with it, and the need to analyze the existing structure as well, and therefore, the possibility of having to strengthen it.

Our designs are all based on using an independent frame.  The steelworks connections, base-plates and foundations are included in the design.

In order to design a mezzanine floor, the following information is needed.

A site investigation report of the ground conditions.

The intended use of the floor or the imposed loading required.

An architectural layout of the building showing the extent of the mezzanine floor and the column positions.

Details of the existing ground floor construction.

Details of any other equipment which will need to be supported by the floor.

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