After the foundations have been completed and the external walls constructed the construction of the floors commences. Floors construction. Function of a ground floor. To carry loads imposed on them. To prevent dampness rising from the ground into the building.
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After the foundations have been completed and the external walls constructed the construction of the floors commences.
Basically there are two types of ground floors:-
solid floors and suspended floors.
One in which the whole floor area is in contact with the
subsoil. Comprised of three main components:-
(a) To ensure consistent material over the whole floor area.
(b) To reduce capillary action of moisture from the ground because of voids within the hardcore layer.
(c) To make up levels after removing topsoil and reduced level excavation.
(d) to provide a clean dry and firm working surface. The top of the hardcore should be blinded with a fine dust or sand to fill the voids, prevent grout loss from concrete and protect D.P.M. if placed in this position.
Damp proof membrane (DPM)
An impervious layer to prevent
moisture travelling through the floor
to the inside of the building eg.
This provides the solid level surface
to which screeds and finishes can
1200 gauge polythene DPM
50 mm min Insulation
Sand and Cement screed
Sand and Cement screed
DPC 150mm minimum above Ground level
100mm Concrete sub floor
Square edge flooring 150mm wide and 20mm thick.
Joist spaced at 400mm centres.
Positions for ventilation
Pre-stressed concrete floor beams cast in the shape of an inverted T
Concrete blocks laid between T beams
100mm sand and cement screed on top of beam floor
Pre-stressed T beam concrete floors were one of the first methods of creating suspended concrete floors. The beams were set in position in such a way that a 450mm concrete block fitted neatly between the beams. The load of the floor was transferred to the foundations by the beams.
Suspended concrete flooring slabs.
Walls constructed to support floor slabs.