Solutions for Poor Sound Insulation in Prefabricated Houses
Poor sound insulation in prefabricated houses can be significantly improved through targeted renovation measures, as detailed below:
Ceiling Sound Insulation
During the renovation phase, a multi-layer sound insulation structure can be constructed in the ceiling: First, adhere a 3mm-thick environmentally friendly damping sound insulation adhesive (approximately 10 yuan/㎡) to the original ceiling surface, and use OSB strips to fix it in sections to form the first sound insulation base layer. Subsequently, fill the ceiling cavity with 5cm-thick high-density sound insulation cotton, utilizing its porous structure to absorb airborne sounds transmitted between floors. If the renovation is already complete, sound-absorbing panels (such as polyester fiber boards) can be added to the ceiling surface as a supplement.
Wall Sound Insulation
When constructing new walls, reserve a 5cm cavity within the stud framework and fill it with sound insulation cotton. Cover the outer layer sequentially with sound insulation felt (density ≥ 2kg/㎡) and 12mm-thick sound insulation boards, forming a composite structure of "damping-sound absorption-sound insulation." For already renovated houses, localized renovations can be carried out on walls adjacent to neighbors: After emptying the wardrobe against the wall, insert sound insulation felt between the back panel and the wall, and cover it with gypsum board to seal the gaps. This method can reduce noise by 10-15 decibels.
Window Sound Insulation
Prioritize casement-type broken bridge aluminum windows, with a profile wall thickness of at least 1.8mm. The glass configuration is best with "6mm+12A+6mm" double-layer insulated laminated glass, which offers 40% better sound insulation performance than ordinary insulated glass. For temporary solutions, high-density silicone sealing strips can be used to seal all gaps between the window frame and the wall, as well as between the window sashes. Actual measurements show that this can reduce outdoor noise by approximately 33%.
Pipe Sound Insulation
For bathroom drainage pipes, adopt a double-layer wrapping process of "damping sheet + sound insulation cotton": First, tightly wrap the pipe with a 1mm-thick golden damping sheet (covering all elbows and tees), then wrap it with 2cm-thick polyester fiber sound insulation cotton, and finally seal the joints with aluminum foil tape. This method can reduce the noise from flushing upstairs from 55 decibels to below 35 decibels.
Other Optimization Measures
- Lay a 5mm-thick rubber sound insulation pad on the floor, covered with composite flooring, to block the transmission of impact sounds.
- Install low-frequency vibration dampers at wall corners to weaken structural sound transmission.
- Use thick curtains (surface density ≥ 800g/㎡) to assist in absorbing mid- to high-frequency noise.
- Install vibration-damping brackets on electrical equipment to prevent vibrations from being conducted through the building structure.
- Adopt the principle of "dynamic and static zoning" in indoor layout, placing bedrooms away from noise sources such as elevator shafts.
When implementing renovations, note the following: Sound insulation projects should be planned in conjunction with renovations. For occupied houses, it is advisable to prioritize treating the areas with the most severe noise issues. Material selection must comply with fire safety regulations (e.g., sound insulation cotton must meet Class B1 flame retardant standards). After construction, acoustic testing should be conducted to ensure that the renovation effects meet the expected goals.
