Now, it first depends on which sounds you want to isolate - those that occur in the home (and "echoes") or those that come from outside through the walls? The first is called "acoustic processing" and the second - "sound insulation". The fact that the rooms are small is a problem ... good sound insulation requires sacrificing at least 10-15 cm of space around each wall ... You can go with 7 (5 mineral wool and one drywall on top), but that's it compromise. On the ceiling, if you have only 4 cm to the window sash, you can not put anything other than cork. It is good to have several layers, so that you can bring at least 1 cm thick. Yes, it can be puttyed and painted with latex on top. But keep in mind that the more you lubricate it and fill its pores, the more you kill its acoustic properties (but not the sound insulation!). If you put it on very lightly, as long as it catches the latex, it retains such a porous, perforated structure on the surface, which can also be used for decorative plaster ... In order not to echo your home, you must have materials on the walls, floor and ceiling that strongly absorb sound, such as kitenitsi, guberni, acoustic panels ... The good thing is that even if you treat only one wall of two parallel ones, the effect is obtained (because the sound waves can no longer be reflected now in one, now in the other to infinity, and echoing ceases in the embryo). That is, if you put on the floor a nice shaggy kitenik, it is not necessary to process the ceiling. The same effect is obtained if you have a lot of furniture in the room, and especially libraries and sections full of books and clothes. It is no coincidence that it is deadly quiet in public libraries ... If you drop heavily folded curtains along one wall, this is a great acoustic treatment. The bare plasterboard walls resound disgustingly - they are to the sound what the mirror of light is ... If you click your fingers between two such parallel walls, then for half a second you hear a sound. However, if you put it on one cork, the picture changes dramatically. Keep in mind that cork performs both functions - soundproofing and acoustic. However, its sound insulation is quite limited (especially with a thin layer). For good sound insulation, a light partition wall is made of steel profiles, parallel to the real one. Put 5, 10 or 15 cm (one, two or three layers) of mineral wool in it. The top is closed with plasterboard (which may be perforated in a certain way for acoustic purposes). And on top you glue 5-7 mm cork. This is the ideal option. If your cotton wool is one layer, you put one with a density of 45-70 kg / m3. If there are two layers: the one on the real wall is glass wool such as URSA TWF FONO or ISOVER Akusto with a density of 20-35 kg / m3. Your second layer is the same as a single layer. If there are three layers: the first two are like the two-layer, and the third (which is from the inside of the room - even denser cotton wool, such as 70-90 kg / m3. With three-layer insulation you will forget that you live in a block of flats and you have neighbors, and you will be able to pick up a lot of noisy parties and parties without the police coming ... For the acoustics - use strongly folded curtains and acoustic panels where possible. Cornice). Where you have to split the centimeter in two - cork as thick as possible (although it is expensive and is glued with nasty glue, like Proma ..). that (in terms of acoustics) you can only process one of two parallel walls (or a pair of sub-ceilings). Foam generally doesn't work. There is a special acoustic one - with open pores (so that the sound penetrates and dissipates into it), but it is a weak brandy. For the floor there are also various acoustic and insulating materials, up to 1 cm thick, which you can put under the carpet, but the small thickness is a prerequisite for a poor result (no matter how "magical" the material is otherwise) ...
1 melison777114 answered
Now, it first depends on which sounds you want to isolate - those that occur in the home (and "echoes") or those that come from outside through the walls? The first is called "acoustic processing" and the second - "sound insulation". The fact that the rooms are small is a problem ... good sound insulation requires sacrificing at least 10-15 cm of space around each wall ... You can go with 7 (5 mineral wool and one drywall on top), but that's it compromise. On the ceiling, if you have only 4 cm to the window sash, you can not put anything other than cork. It is good to have several layers, so that you can bring at least 1 cm thick. Yes, it can be puttyed and painted with latex on top. But keep in mind that the more you lubricate it and fill its pores, the more you kill its acoustic properties (but not the sound insulation!). If you put it on very lightly, as long as it catches the latex, it retains such a porous, perforated structure on the surface, which can also be used for decorative plaster ... In order not to echo your home, you must have materials on the walls, floor and ceiling that strongly absorb sound, such as kitenitsi, guberni, acoustic panels ... The good thing is that even if you treat only one wall of two parallel ones, the effect is obtained (because the sound waves can no longer be reflected now in one, now in the other to infinity, and echoing ceases in the embryo). That is, if you put on the floor a nice shaggy kitenik, it is not necessary to process the ceiling. The same effect is obtained if you have a lot of furniture in the room, and especially libraries and sections full of books and clothes. It is no coincidence that it is deadly quiet in public libraries ... If you drop heavily folded curtains along one wall, this is a great acoustic treatment. The bare plasterboard walls resound disgustingly - they are to the sound what the mirror of light is ... If you click your fingers between two such parallel walls, then for half a second you hear a sound. However, if you put it on one cork, the picture changes dramatically. Keep in mind that cork performs both functions - soundproofing and acoustic. However, its sound insulation is quite limited (especially with a thin layer). For good sound insulation, a light partition wall is made of steel profiles, parallel to the real one. Put 5, 10 or 15 cm (one, two or three layers) of mineral wool in it. The top is closed with plasterboard (which may be perforated in a certain way for acoustic purposes). And on top you glue 5-7 mm cork. This is the ideal option. If your cotton wool is one layer, you put one with a density of 45-70 kg / m3. If there are two layers: the one on the real wall is glass wool such as URSA TWF FONO or ISOVER Akusto with a density of 20-35 kg / m3. Your second layer is the same as a single layer. If there are three layers: the first two are like the two-layer, and the third (which is from the inside of the room - even denser cotton wool, such as 70-90 kg / m3. With three-layer insulation you will forget that you live in a block of flats and you have neighbors, and you will be able to pick up a lot of noisy parties and parties without the police coming ... For the acoustics - use strongly folded curtains and acoustic panels where possible. Cornice). Where you have to split the centimeter in two - cork as thick as possible (although it is expensive and is glued with nasty glue, like Proma ..). that (in terms of acoustics) you can only process one of two parallel walls (or a pair of sub-ceilings). Foam generally doesn't work. There is a special acoustic one - with open pores (so that the sound penetrates and dissipates into it), but it is a weak brandy. For the floor there are also various acoustic and insulating materials, up to 1 cm thick, which you can put under the carpet, but the small thickness is a prerequisite for a poor result (no matter how "magical" the material is otherwise) ...