Sound insulating walls or ceilings
Sound insulation a flat
One family from Germany, reports:
The noise from the apartment next door was just too much, so we had to find a noise insulation solution. We live in a maisonette that shares a wall made from limestone bricks with the maisonette next door. The building dates from 1987. Even though limestone is supposed to dampen sound, noise from various sources (radio/TV, telephone and general conversations, walking) in our neighbor’s apartment could be heard loudly through the wall. This noise problem was also perceived by our visitors.The design of the building, especially the position of the spiral stair leading to the second floor, restricted the overall thickness of the sound-insulation curtain wall to a mere 50 mm. This led to our choice of 32-mm thick soni COMPOSITE inserted between 28-mm wood laths, on which plaster boards (2600 x 600 x 12.5 mm) were fixed with drive screws.
On both the wall and the plaster board sides, the faces of the wood slats were covered with sealing tape to minimize sound transmission.
The sound-insulation panels were very easy to cut to the right shape and glue into the compartments between the laths. As the total thickness of the wood laths plus the sealing tape on both sides was 30 mm, there was no gap between the plaster board and the acoustic foam and the overall thickness was even below the maximum thickness of 50 mm.
This measure now largely eliminates any normal noises such as walking or radio/TV and also dampens the peak noises, such as a very shrill voice, to a tolerable level. 52-mm panels would probably have led to even better results, but in any case our apartment is so much quieter now than before!
Sound insulation of a ceiling
An other family says:
Our problem was the high noise level from the apartment on the next-higher floor. To fight this noise, we needed to replace the complete wood ceiling by a new, sound-proofing construction.
In old houses it is often very difficult to define the best solution because of the special construction and building materials used. Our traditionally built ceiling, for instance, was filled with straw and cinder.
We sent soniflex an email describing the problem. They answered promptly with an exact description of what the new ceiling construction should look like and a list of the materials needed.
We ordered soni PROTECT R acoustic panels and cartridges of soniflex special adhesive which were delivered via DHL.
For the new ceiling construction we used wood laths (4.8 x 5.8 cm) fixed to the walls at both ends and to the ceiling beams at several intermediate points, wherever possible.
The question was how to ensure acoustic decoupling from the existing ceiling. And we had an idea: We simply cut some soni PROTECT R panels to fit the laths’ width and inserted it between the new laths and the old ceiling. This was pretty easy to do and the best solution for preventing noise transmission.
Then the soni PROTECT R acoustic panels were glued between the laths on the old wood ceiling, using the special soniflex adhesive. The adhesive could be applied either in individual dots or in a zigzag pattern, as best fit the situation.
Then plaster boards were fixed to the laths, the gaps filled with putty and the surface smoothed.
With the 5.8 cm thickness of the laths and the additional soniflex material between laths and old ceiling, there was a hollow space of 0.5 to 0.8 cm left between the soniflex material and the plaster board. According to soniflex, the air in this space acts as an additional insulation layer.
We also followed the instructions of soniflex to leave a gap between the plaster boards and the wall and fill it with an acrylic sealing material for acoustic decoupling of the boards and the walls.
With the support of soniflex and of course their soni PROTECT R material, it was possible even for laypeople like us to achieve a very good sound protection result