Wall sound insulation

What is wall sound insulation?

Wall sound insulation is a multi-layer acoustic composite added to one or both faces of an existing partition to reduce sound transmission to neighbouring rooms. By the Mass Law, doubling the structure mass adds about 5-6 dB; correct design lifts that to 18-25 dB.

When is it needed?

• Neighbours' speech audible through the wall
• TV from the living room heard in the bedroom
• Meeting noise leaking from an office partition
• Noise complaint discovered after a renovation
• Hotel-room separation needing Rw 50+

How is it applied?

1. Survey and measurement: wall structure, thickness, junctions; existing Rw measured.
2. Design: composite section calculated for target Rw.
3. Construction: vibroacoustic hangers fixed to the existing wall.
4. Fill: 60-80 mm rock wool (min. 70 kg/m³).
5. Cladding: two layers of acoustic plasterboard at different thicknesses to break resonance.
6. Intermediate membrane: elastomeric (Tecsound) between the two boards.
7. Corners and junctions: resilient tape + acoustic mastic.
8. Final measurement: written report confirming the target Rw.

Materials we use

• Acoustic plasterboard (densified)
• Rock-wool fill (min. 70 kg/m³, A1 fire class)
• Elastomeric membrane (Tecsound or equivalent)
• Vibroacoustic hangers and resilient connectors
• Acoustic mastic and resilient tape

Target performance values

• Internal partition: Rw 42-48 dB (privacy)
• Between apartments: Rw 50-55 dB (neighbour speech almost inaudible)
• Between hotel rooms: Rw 55-60 dB (premium)
• Studio: Rw 60-70 dB (professional)

Lead time and cost

A single wall (10-15 m²) typically takes 1-2 days. A whole flat 5-8 days. Cost depends on target Rw and existing wall — clear quote after survey.

Certificates and standards

All materials carry EN 13501-1, BS 476 Class 0 and UNI 9175. Performance is measured per EN ISO 717-1 and reported.