An effective floating floor has as a heavy top layer and soft bottom layer. PAROC stone wool under concrete slabs that are at least 50 mm thick is the optimal solution for floating floors. Ensure that the concrete slab on top of the insulation is totally separated from the surrounding walls. Use a piece of insulation during the casting to form the needed gap between the wall and floor slab.

Concrete floor, step sound 4
  • Floor covering
  • Floating concrete slab
  • Step sound insulation: PAROC SSB 1
  • Supporting structure: concrete
  • Ceiling


Table below: Approximate data for airborne and impact sound insulation of different concrete floors, with and without a floating floor:

   2*13 gypsum board
 +
   50 mm concrete  Wooden floor board
 +  +
 50 mm PAROC SSB1  25 mm PAROC SSB 2
 +  +
Concrete floor  Concrete floor Concrete floor Concrete floor
 Density kg/m3  R' w /L'nw dB/dB  R' w /L'nw dB/dB  R' w /L'nw dB/dB
 300 (130 mm)  50/80  55/50  53/58
 400 (175 mm)  55/75  60/45  58/53
 600 (260 mm)  60/70  65/40  63/48
 R' w  + C50-3150 can be 0 – 3 dB lower
 L' nw  + CI50-2500 can be 0 – 3 dB higher


Find the solution you need below for different types of floating floors. First, choose first the level of sound insulation you need, then check then the construction layers required to achieve the level. The level is based on local building regulations. From the two last columns you can also find airborne sound insulation values for these floor types.


 Step sound insulation:
Air borne sound insulation with corrections (C) This structure:  Demand:
w + C  Structure Description  w + C50-3150  w + C50-3150 
 48 C  Step sound insulation solution 50 mm concrete 
50 mm PAROC SSB 1
250 mm concrete
 64  61
 52C  Step sound insulation solution 50 mm concrete 
50 mm PAROC SSB 1
200 mm concrete
 61  57
 54C  Step sound insulation solution 50 mm concrete 
50 mm PAROC SSB 1
HD/F 120/27
 62  61
 56C  Step sound insulation solution 50 mm floor plasterboard 
30 mm PAROC SSB 1
160 mm concrete
 58  53
 58C  Step sound insulation solution 2 x 12,5 mm floor plasterboard 
17 mm PAROC SSB 2t
HD/F 120/27
 58  57
 62C  Step sound insulation solution 2 x 12,5 mm floor plasterboard 
25 mm PAROC SSB 2t
HD/F 120/19
 54  53

 Air borne sound insulation without corrections This structure: Demand:
w Structure Description  w  w 
 60  Step sound insulation solution 2 x 12,5 mm floor plasterboard 
17 mm PAROC SSB 2t
HD/F 120/20
 56  49
 64  Step sound insulation solution 22 mm floor chipboard
25 mm PAROC SSB 2t
HD/F 120/20
 55  44
 66  Step sound insulation solution 22 mm floor chipboard 
17 mm PAROC SSB 2t
HD/F 120/20
 54  49
 68  Step sound insulation solution Any floating floor on any 
concrete intermediate floor
   40

Note: The values above are valid for structures in a building, including flanking transmission and other factors. An isolated structure measured in a laboratory may give better values.