The project
A decoupled ceiling build-up designed to reduce sound transfer.
The existing ceiling was opened to expose the timber structure between the flats. A layered acoustic build-up was then installed, combining absorptive mineral wool, resilient metal bars and added board mass before the surface was plastered and redecorated.
The acoustic build-up
- Open the existing ceiling and inspect the supporting timbers
- Fit mineral-wool acoustic insulation between the joists
- Install resilient bars across the joists to reduce the direct vibration path into the new lining
- Fix two layers of SoundBloc acoustic plasterboard to the resilient-bar system
- Stagger the board joints between layers and seal vulnerable perimeter gaps
- Tape and prepare the board joints before applying a smooth plaster finish
- Allow the new plaster to dry, then decorate the ceiling in white
Why the layered system matters
Acoustic ceiling upgrades work through a combination of absorption, separation and mass. The mineral wool helps absorb sound within the void, resilient bars reduce rigid contact between the structure and ceiling lining, and the double-board layer adds density. The components were installed as a coordinated build-up rather than as isolated products.
This case study describes the work shown and does not state a tested decibel reduction or certification for the completed floor-and-ceiling construction.
The result
The flat was left with a clean, smooth ceiling and a substantially upgraded separation between the two homes. All acoustic layers are concealed within the finished construction, preserving normal room height and appearance as far as the system allowed.
