1, building materials expand when heated and contract when cooled. Building materials, such as concrete and steel bars, will make a creaking sound when they expand when heated and contract when cooled, which is called "stress action".

2. Home decoration materials, such as wood and wooden boards, will change slightly with the change of environment, such as temperature, humidity and wind, which will deform the wooden boards. These deformations are so subtle that the human eye may not notice them, but they are enough to make a sound in the deformation.

Ways to reduce the sound:

First, reduce the smoothness of the wall.

If the wall is too smooth, any sound in the room will echo when it touches the smooth wall, thus increasing the volume of the noise. Therefore, you can choose wallpaper and other decorative materials with good sound absorption effect, and you can also use "soft bags" and other decoration methods. You can also use decoration materials such as cultural stones to make the wall rough and let the sound waves refract many times, thus reducing noise.

Second, the indoor light should be soft.

Brightly colored or rough floors, ceilings and walls will interfere with people's central nervous system and make people feel irritable, thus making people particularly sensitive to noise. Therefore, when choosing various lamps and decorative materials for interior decoration, special attention should be paid to soft light.

Third, use wooden furniture to absorb noise.

Because wood furniture has the characteristics of porous fibers, it can absorb noise. The purchase of furniture should not be too much or too little, too much will bump into each other because of crowded handling and increase noise. Too little will make the sound spin indoors.

Fourth, the clever use of fabrics.

The sound absorption function of fabric products is well known, so it is also a common and effective method to use fabric to eliminate noise. Experiments show that the sound absorption effect and effect of suspended and tiled fabrics are the same, such as curtains and carpets. And the sound insulation effect of curtains is the most important.

Fifth, the window facing the street is changed into a soundproof window.

This is a good way to deal with the intrusion of external noise into the room. The so-called soundproof window is to separate the sound with two layers of windows, which is suitable for all noise interference.