There is a strong opinion among apartment owners that it is worth using polystyrene to install sound insulation. This material is quite light and cheap. However, experts advise to abandon this idea, especially when it comes to mounting such sound insulation on the ceiling. Professionals have already verified that polystyrene is more effective on the floor. In this case, it is placed when pouring floors or under plaster, and then it really absorbs sounds quite well. But with the ceiling, things are much more complicated. In this regard, on the Internet you can find a lot of conflicting reviews. The installation looks as follows.
Very careful preparation of the ceiling is required. All old paint, plaster is removed from it, stripping is carried out with a stiff brush to remove the smallest debris and dust. Then it is necessary to cover it with a primer in two layers, which will provide good adhesion. A liquid waterproofing agent is applied over the primer. When it dries completely, a fine-mesh reinforced mesh is fixed. It is necessary as a base for building glue, noise insulation boards are already glued to it, and the joints, respectively, are covered with sealant. But that is not all. After the glue has set, you need to fix the frame from the metal profile, and it can not be left in its original form, it is important to insulate it with a soundproof tape. Next, plasterboard sheets are mounted in a classic way, and the seams between them are rubbed with soundproofing sealant. If the drywall or the frame in some place comes into contact with the pipes, it is necessary to use special noise-insulating linings. Next up is the standard drywall finish.
In addition, it must be noted that the foam is not initially positioned as a soundproofing material. If it is placed under the screed, it is only able to partially absorb shock noise. If an extruded polystyrene is taken, then on the contrary it transmits sound better than normal, due to its density.
If you still want to use this particular material, you will have to resort to the method of alternating a dense and porous version. Thus, a sandwich will be made of two layers of plywood 1 cm thick each, and polystyrene is laid between them. Also, if we are talking about a living room, then we must take into account the high combustibility and fire hazard of the foam. Against its background, mineral wool stands out in this regard, which is recommended by professionals.
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