🕑 Reading time 1 minuteConcrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab ContentsConcrete Floor Slab Construction Process1 Assemble and Erect Formwork for Slab2 Prepare and Place Reinforcement for Slab3 Pour,Ground bearing slabs should not be used in ground conditions where heave can occur or where the foundation depth is greater than 15m Under these circumstances a suspended floor construction should be used Site preparation The ground beneath the floor should be stripped of all topsoil, organic matter or tree roots prior to filling and compaction Traditional ground floors have consisted of little more than a few flagstones or bricks placed directly over the soil The Victorian era saw the widespread introduction in mass housing with suspended timber floors, alongside rudimentary solid floors in hardwearing areas such as kitchens and hallways This combination persisted well into the 1930s, with solid concrete
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Suspended in situ concrete ground floor slab
Suspended in situ concrete ground floor slab- Suspended slab may be the most expensive compared to Suspended ground floors – where the slab is supported on beams and/or loadbearing sleeper walls and is not in direct contact with the ground Suspended slab under construction, with the formwork still in placeA suspended ground floor is one of the leading causes of heat loss within older homes But there is a way to prevent energy loss and keep out the cold Suspended floor insulation can help to ensure a room retains heat and is energy efficient Read on to find out all about our applications and everything else you need to know
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A suspended floor is a ground floor with a void underneath the structure The floor can be formed in various ways, using timber joists, precast concrete panels, block and beam system or cast inA suspended concrete floor is a floor slab where its perimeter is, or at least two of its opposite edges are, supported on walls, beams or columns that carry its self weight and imposed loading The floor spans between supports and will normally deflect under load to a dimension that is limited by the design usedSuspended Concrete Slab Suspended concrete slab is referred to a cement slab that is not in contact with the ground This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground The most common application of suspended slab in residential construction is used at garage floor where below the garage floor
For slabonground floors it provides an understanding of the footing/slab selection, design, detailing and construction requirements contained in AS 2870 and the Housing Provisions of the BCA The requirements of AS are also covered For suspended floors it covers both upper floors and those at ground level where a slabonground may Firstfloor slab thickness The normal thickness used for reinforced concrete slabs in South Africa is 170 mm for small slabs, 255 mm for slabs larger than 5m x 5m and 340 mm thick for longspan slabs forming part of a beam and carrying heavier loads The thickness of a slab will depend on the use and span of the slabSuspended timber floor As a requirement of the Building Regulations the structure should be protected against the growth of weeds and other plantlife The ground should have a layer of concrete poured across and there should be a ventilated gap of at least 150mm between the underside of the timbers and the concrete, to prevent moisture gathering and affecting the
Due to possibility of movement in the ground surface make sure you use steel reinforcement mesh even though it is not suspended and use a waterproof membrane such as heavy unbroken plastic to stop water penetrating the underside of the slab Try tIt is assumed that the ground gives no support but simply acts as in situ formwork for the floor slab The design is the same as for suspended floors, using the approaches in BS 8110, now withdrawn and superceded by Eurocode 2 From a construction point of view, it is economic to transfer the slab loads directly to the piles without any beamThe Polyvoid slab is a suspended ground floor slab, that is designed for reactive soils and works by separating the slab from the reactive soilsThis slab wa
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Suspended floors are also used when the water table is high, or when aggressive chemicals are present in the soil that may attack the concrete slab The ground floor is made up of suspended concrete slab or beam and block floor, supported by the external and internal load bearing walls, which transfer the loads to the foundations below Suspended Ground Floor Slabs For situations where the ground is unsuitable for the support of the ground floor slab or where the slope of the site makes it economic to leave a void below the ground slab, suspended floors are adopted Where a void is left below the slab, a precast floor system can prove economic and durable if suitable coverPrecast suspended ground floor Insulation above slab, with timber floor finish Ground Floor Insulation above slab DETAIL 401, 11 Ground Floor Insulation above slab Seal all penetrations through air barrier using a flexible sealant or tape Seal between wall and floor air barrier OR seal gap between skirting
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The floor right on top of the ground is called a ground bearing floor while everything else is suspended The insulation must be strong and waterproof The slabs needs to be of low conductivity material, so that the thickness of the insulation can be reduced It also needs to be able to withstand the load of the floor construction as well as A Best Practice Approach To Insulating Suspended Timber Floors Fintan from our Technical Team discusses the thermal loss issues associated with suspended timber floors and outlines a best practice approach to tackling them At the turn of the 18th century, when construction techniques moved from boarded floors installed directly on the groundIf embedded floor heating is incorporated in a concrete slabonground, the slab must be insulated so that heat from the slab is delivered up into the space above and not lost to the exterior and ground below Suspended ground floors â where the slab is supported on beams and/or loadbearing sleeper walls and is not in direct contact with the ground The design of suspended floors
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While the concrete ground floor slab is a common feature in New Zealand homes, suspended concrete floors have been slower to catch on outside commercial and architecturally designed homes However, suspended concrete floors offer many benefits for residential buildings, including excellent structural performance, thermal advantages and sound dampeningWhere a concrete floor slab is to be built on weak ground of poor supporting characteristics, it may be supported on concrete pile foundations or ground beams to prevent excessive slab settlement under imposed loading These slabs will have to be designed and reinforced as suspended floors Suspended Floors All you need to know What are they?
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NHBC requires ground floors to be constructed as suspended floors in the following situations where the depth of fill exceeds 600mm, as described in Chapter 51 'Substructure and ground bearing floors' (Design) where soil swelling may occur, as described in Chapter 42 'Building near trees' on sites which have been subject to vibratory groundSuspended ground floor slab; Suspended slabs are aboveground level slabs which are not directly in contact with the earth They are commonly used to create floors for the upper storeys of houses, but can also be sat on top of preconstructed walls to form a ground floor
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