Floor insulation Dobrodošli u Knauf Insulation Srbija!

Floor insulation Dobrodošli u Knauf Insulation Srbija!

Floor insulation

Ona mezzanine structure, the floor must be designed and constructed in such amanner that during the exploitation of the building, together with thesupporting structure, it may permanently provide the following:

    Stability, flatness of the surface and safety – the loads provided for by the design must be transmitted by the floor to the supporting structure without any damage or permanent deformation

Acoustic protection – in accordance with Standard SRPS U.J6.201, a ceiling between two flats should fulfill the requirement for the minimum value of acoustic insulation power Rw of 52dB and the maximum value of impact sound level Lw of 68dB

Thermal protection – in accordance with the technical conditions for thermal protection of buildings, as per Standard SRPS U.J5.600

Fire prevention – as prescribed by the regulations of fire prevention; in case of fire, or during decomposition of floors, materials incorporated in the floors must not release toxic gasses that may increase the danger and make the rescuing of people more difficult.

Allof these are possible to achieve at the same time by using Knauf Rock rock mineral wool insulation.


    The highest level of impact sound protection is ensured – such ceilings belong to the class of improved acoustic protection in accordance with the existing Standard

Reduced transmission of air sound through mezzanine structures – excellent absorption material

Thermal protection also provided – thermal conductivity group 040

Improved fire prevention of the building – incombustible material with extremely high melting temperature of above 1000˚C, thus providing a longer fire prevention

Excellent adaptation to possible minor uneven areas of the base – slabs are flexible with stable shapes

There is no possibility that sound and thermal bridges may occur – good adherence of slab edges reduces the possibility of clearance formation between slabs

A longtime tradition of installation – simple and fast installation

Possibility of constructing a floor over installation ducts – installation ducts may be conducted through the insulation layer


Asound emitted by a vibrating object due to an action (impact) of anotherobject, and transmitted through a solid medium is called asound of impact.

Thistype of sounds is characteristic for mezzanine structures because it isgenerated as a result of walking, dragging of chairs, operation of householdappliances in contact with the floor etc. It is a very unpleasant source ofdisturbances and a very frequent reason for complaints of residents inbuildings. This is why impact sound insulation is one of the significantparameters of residential quality, i.e. of “acoustic comfort” of living.

Aphysical characteristic of a ceiling that shows its permeability for the energyof sound is called normalized level of impact sound. and the unit ofmeasure is (dB).

Themain impact sound insulation solution in modern civil engineering is a floatingfloor structure.


Afloating floor structure mainly consists of a rigid slab (supportingfloor layer) over which load is distributed, and a soft flexible insulationlayer upon which it rests with its whole area, at the same time beingseparated from other construction parts of the building.

Efficiencyof a floating floor structure primarily depends on flexible characteristics ofthe insulation layer.

KnaufRock rock mineral wool is amaterial solid enough to bear the load of upper layers of a floating floorstructure. It is also flexible enough to reduce vibrations i.e. to absorb and dampimpact sound, thus providing a high level of acoustic protection.


Forproper installation of a floating floor structure, over the mezzanine structurethat must be dry and flat enough the following should be placed:

    1. Edge divides of Knauf Rock rock mineral wool d=1cm, against surrounding walls in order to separate the floating floor structure from the walls and prevent the occurrence of sound bridges i.e. prevent lateral conduction of sound; the height of divides is greater than the total floor height

2. Insulation slabs of Knauf Rock rock mineral wool are precisely positioned next to each other; rock mineral wool to be used depends on the floor purpose and expected load:

“wet” method                                                            “dry” method

POD CLASSIC ≤ 2,0kN/m 2                               POD EXTRA ≤ 1,5kN/m 2 (chipboard d ≥ 22mm)

POD PLUS      ≤ 5,0kN/m 2

POD EXTRA    ≤ 10,0kN/m 2

    3. PE or PVC foil with an overlap of 10-15cm that should be stuck with common wide adhesive tape; the foil is intended for protecting the insulation from damping during the construction of wet screed or when the floor is located above an unheated space; the foil is bended from horizontal to vertical position, against the wall, at the height above the edge divides

4. Rigid slab – two methods are used depending on the material:

“wet” method: wet screed (screeded bed) is commonly obtained by casting of cement concrete in situ – the thickness must not be less than 4cm (note: the thickness depends on the designed load and the compressibility of insulation layer – consult the screed manufacturer); such a screed should be reinforced with a reinforcement mesh or appropriate fibers

“dry” method: boards for dry screed (chipboard, veneer base etc.) are jointed by nailing or by gluing; ask the manufacturer for information about the bearing capacities of dry screed slabs and for advice about installation

5. Depending on the purpose of the room, an appropriate final floor covering should be selected: parquet, laminate, ceramic tiles etc.; before placing it, cut with a sharp knife the excess edge divides and foil above the height of the finished floating floor structure.

Noteson installation:

    — Knauf Rock insulation slabs should be placed in the direction from the edge walls towards the door.

- At the construction of a rigid plate, all transport routes leading over the rock mineral wool slabs must be secured with temporary paths.

- Rigid joints, the so-called sound bridges, may significantly deteriorate or even eliminate impact sound insulation; during installation, it is therefore important to separate the floating floor structure from other construction elements and all possible penetrations.

FROMTHE ASPECT OF ENERGY EFFICIENT CONSTRUCTION, the following examples of mezzanine structure thermal protectionare also possible:

    Insulation carried out from the lower, colder side of a mezzanine structure – above unheated space or open passages – in the following systems (depending on the particular situation and the solution within design documentation):

- suspended ceiling KR S or

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