As for the door, you can choose the molded sound-proof door, which has a good sound-proof effect, because its filler is a paper-based honeycomb structure, which can form a closed air layer, thus playing a sound-proof role; In addition, you can also take a hollow double door with a cavity, the panel is plywood, and the sound-absorbing cotton is wrapped in the middle; If the door panel is a multi-layer composite sandwich door, the gap of the door should be made into an oblique opening, and a blanket or adhesive tape seal can also play a certain sound insulation effect.
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The sound insulation of the wall is related to its thickness and surface treatment, and there are two specific solutions. One is to tear down the original wall and rebuild a soundproof wall. Chip board is added on both sides and glass fiber is filled in the middle. This scheme works well. The second is to keep the original wall and add a soundproof wall. Add a few new columns to form a soundproof wall with glass fiber inside. The simplest method is to spread a layer of cement evenly on both sides of the brick wall, which is the most effective and economical method to increase the sound insulation effect. If it is a light wall, you can also add low-density gypsum board, mineral wool sound-absorbing board or cement fiber pressure board partition to improve its sound insulation ability.
In addition, you can also choose some decorative materials with good sound absorption effect to stick on the wall, and you can also use decorative materials such as diatom mud and cultural stones to reduce noise. Rough walls will refract sound waves many times, effectively reducing noise.
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The thickness of the floor is usually thinner than the wall, and the area of the floor is usually larger than any wall in the same room. In addition, it is difficult to deal with and the material cost is high, which makes the floor the weakest link and the most difficult place to deal with. To do a good job of floor sound insulation, we can spread a high-density environmental protection sound-absorbing cotton and vibration-reducing pad on the structural floor, and then make a 40mm thick concrete floor, and the weighted impact sound pressure level can be less than 60dB. If the wooden floor is nailed into a cavity, it will have good absorption ability for frequencies below 100Hz, and the low-frequency effect of sound will be good; In addition, you can also spread river stones and sand on the ground, then grind 3cm cement on it, and then spread the floor. Because laying pebbles under the floor can fill the gap that is easy to cause standing waves and earthquakes, and even overcome the disadvantages of hollow wood floors, but these practices are huge. Simple, you can first put 5 cm thick sound-absorbing cotton between the squares on the keel, and then spread 8 mm thick carpet on it with fir board.