There are various types of steel decking available namely the non-slip checker plate steel deck or ‘Vastrap’ which comes in sheet sizes of 1200 x 2500 and various thicknesses depending on the joists spacing’s and the carrying capacity. You can also use the plain steel decking of similar size which is preferable when using a pallet jack on the mezzanine. This type of steel decking would be used in high risk fire areas where timber is not an option. It is also preferred for external or wet areas where the deck could also be galvanized. An even more durable option in wet areas and especially in the food industry is the use of aluminium checker plate decking which can then also be welded together in order to create a totally solid and leak proof top deck.
Steel floor construction
The main supporting structure of the steel mezzanine floor construction consists entirely out of steel components. The columns are generally either square tube sections or H-beams which has a base plate, for fixing to the existing concrete floor, and top plate, for fixing to the main bearer beams. In some cases it is possible to fix the mezzanine structure directly to the structure of the building by either attaching to the existing steel columns or the walls of the building. This generally allows you to eliminate a few extra columns.
The main bearer beams are generally steel universal or I-beams which come in various sizes depending on the span and carrying capacity. These bearer beams can also be custom designed girders if the span of the beam is very large. The steel joists are either welded or bolted to the main beams and can be lip channel or I-beams. The span and carrying capacity of the joists will determine its size and the thickness of the decking will determine the centres of the joists. The steel decking is then screwed or welded to the joists.
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