Partition wall insulation



Download abrochure:    Prefabricated_partition_wall_insulation.pdf [450Kb]


Partition wallsmust be designed and constructed in such a manner that, in addition tofunctional partitioning of space, they may provide acoustic and fire protectionas well; they should also provide thermal protection if they separate a heatedroom from an unheated one.  


By using KnaufRock NaturBoard FIT-G PLUS rock mineral wool, characteristics of partition walls aresignificantly improved, providing simultaneously acoustic, fire and thermalprotection. 


  • Improved acoustic protection – excellent absorption material owing to its open porosity and high density

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

  • There is no distortion or sinking of the insulation material – permanent dimensional stability in the system is provided  

  • Thermal protection ensured – heat conductivity group 040

  • Simple and fast installation  

  • Optimal dimensions of slabs for installation between substructure profiles

  • Mounting of other installations within the system is enabled.


A sound that isgenerated and transmitted by air is called air sound.

A sound isgenerated by the oscillation of air particles which are taken out of their positionof equilibrium by an external effect (by the source of air sound). Typicalsources of air sounds are human speech, music devices, TV, music instrumentsetc.

A physicalcharacteristic of partition walls that shows their capability to retain theenergy of sound is called  sound insulatingpower, and the unit of measure is decibel (dB).

The main air soundprotection in buildings is partition walls.


Prefabricatedpartition walls mainly consist of a metal or wooden substructure on acoustic buffers,a covering of one or several slabs (veneer base, mineral, wooden etc.) and an infillingof fibrous material with open porosity and with airflow resistance of min. 5kN·s/m4.

The higherabsorption coefficient of the insulation material (α), the lower intensity ofthe part of sound energy that penetrates the partition.




1. Beforeinstallation, appropriate sealing tape or putty should be applied to edgeprofiles in order to ensure the connection of the profiles with the walls,floor and ceiling. Then the edge profiles should be tightened with appropriatetightening elements. Vertical profiles of the substructure should be placed ataxial distance of 60 - 62,5cm between floor and ceiling horizontal edgeprofiles (in accordance with the manufacturer’s instructions).

2. Onone side of the wall, veneer base should be placed and tightened to thevertical profiles of the substructure with screws at certain distance. Then allinstallations provided for by the design should be carried out. 

3. Inorder to obtain acoustic, fire and thermal protection defined by standards, KnaufRock NaturBoard FIT-G PLUS rock mineral wool slabs should be placed between theprofiles of the partition wall substructure. 

4. Theother side of the wall should also be covered with veneer base. The wall isthus closed. Finishing of the wall should be carried out in accordance with thepurpose of the room, as well as in accordance with instructions of the veneerbase manufacturer. 

Notes to theinstallation:

Properselection of the structure and material of a partition wall is not a guaranteethat the acoustic protection will also be appropriate. Because of that, careshould be taken at the installation to avoid the occurrence of sound bridges:

  • Rock mineral wool slabs should be placed close to each other (with no clearances between them) and good adherence of the slabs to the supports of the substructure should be provided.

  • Joints of the partition wall with sidewalls, floors and ceilings, as well as joints of all additional elements incorporated in the partitions (windows, doors, ventilation and installation canals…) must be properly executed – in accordance with instructions of the manufacturer of dry-mounting walls.


Prefabricated partition walls may provide a highlevel of acoustic protection with a proper selection of infilling, veneer baseand substructure. 


Partition wall type

According to  Knauf system


Knauf Rock

 Insulating  power

Rw (dB)

Single metal substructure and single covering

W111, profile 75CW

 NaturBoard FIT-G PLUS



Single metal substructure and double covering

W112, profile 75CW

 NaturBoard FIT-G PLUS



Single metal substructure and triple covering

W113, profile 75CW

 NaturBoard FIT-G PLUS



Wall between flats

Double metal substructure and      double covering + slab inside the wall

W115, profile 75CW

NaturBoard FIT-G PLUS







Results of  sound protection measuring (results of measuringin a chamber without lateral conduction):



Improvement ofa brick wall insulation against air sound is ensured by using Knauf Rock NaturBoard FIT-G PLUS rock mineral wool slabs in a system with a covering consisted ofone veneer base on a metal substructure (in accordance with recommendations ofveneer base manufacturer).

The improvementof air sound insulation measured in a chamber without lateral conduction withinstalled 5 cm thick NaturBoard FIT-G PLUS rock mineral wool is 14dB.

When placinginsulation on the warmer side of a wall (at external wall insulation from theinside, or at insulation of a wall between heated and unheated rooms), a vapourbarrier must be placed on the warmer side of insulation material, i.e. between rock mineral wool and veneer base. 




Advicefor proper use