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Impact sound reduction for stairs and landings

  1. Impact sound reduction for stairs and landings
Trinnlyd i repo vegg ENG
TSS 102 soundreduction med tekst ENG
IC Box 100 SRU soundreduction med tekst ENG
Trinnlyd i repo vegg ENG
TSS 102 soundreduction med tekst ENG
IC Box 100 SRU soundreduction med tekst ENG

Stepsound from stairs can be a big challenge.

Since 2007, Invisible Connections have tested and developed products that reduce stepsound from stairs.

  • There is an increasing focus on stepsound.
  • Several construction methods that do not meet the requirements.
  • Step sound that transfer to neighboring rooms.
  • Pay attention to the requirements in the building regulations Byggforskserien 532.241 (Norwegen requirements)
Download our Impact sound reduction guide
Impact sound reduction i landing: TSS 102Impact sound reduction in wall: IC Box 100 SRUImpact sound reduction in landing/wall:
Vertical rubberflange
Impact sound reduction 20-25 dBImpact sound reduction 20-28 dBImpact sound reduction 10-12 dB

Our experience, for good impact sound reduction, you need a soft rubber e.g 58 shore :

  1. Minimum area of 200-250 mm2 pr. kN breaking load.
  2. Grooves allow the rubber to expand under load.

What do the regulations say?
DIBt ; Deutsche Institut für Bautechnik

DIBt has shown in its publication that there is a connection between dB,
sound absorption area and load.

The calculation below shows DIBts formula and our product TSS 102.

Reduction : 30 dB = 60 kN ultimate load

Area : 115x110=12650mm2/60 kN = 210 mm2 / kN

TSS 102 = 25 dB. 100 kN

Area : 25000 mm2 = 250 mm2/ kN

Impact sound in concrete stairs without reduction (from Byggforskserien 532.241)

The figure shows transmission of sound from floor and stairs structures whitout any impact sound reduction.

The table below shows limit values ​​from NS 8175 regarding housing.

Type of room

Class B


Class C


From commen area/stairs area too living units


To a living unit from a toilet, storage room, balcony, terrace


To a living unit from business area, service area, public area


The table below shows the highest limit values ​​for normalized impact sound level, class C for various buildings

Type of buildingClass C (dB)Class B (dB)
Living units5348
Meeting rooms58

Recommended solution for living units

Important advice on impact sound reduction!

  1. No casting larger than the vertical rubber flange W= 250 x H=200.
  2. Elastic joint between landing and wall min. 10mm.
  3. Do not lay tiles into the wall min. 10 mm gap.
  4. Base tiles, min. 10 mm gap between the landing.
Article nrDescription

Sound reduction

TSS 102

Contains sound reduction unit between the
inner tube/outer tube and a rubber flange between the landing and wall.
Capacity up to 96 kN in a 170 mm thick (min.) landing,
up to 100 kN in a 200 mm thick landing.

20-25 dB
IC Box 100 SRU

Recessed box made of recycled HDPE and SRU 100 unit.
Can be combined with TSS/RVK 60 P, TSS/RVK 101.

20-28 dB
Recommended solution for schools, hospitals etc.

Recommended solution for:

Schools, hospitals, hotels, meeting rom, offices. TSS/RVK 60P or 101 with vertical rubberflange

Article nrDescriptionSound reductionPicture
GFVertical rubberflange between the landing and wall10-12 dB