How to choose the thickness of sound insulation felt?

When choosing the thickness of the sound insulation felt, it is necessary to make a comprehensive judgment based on the actual noise situation, installation conditions, and sound insulation requirements of the scenario. The following are more detailed reference directions:

First of all, start from the type and intensity of noise. When dealing with medium and high-frequency noises in daily life, such as voices, TV sounds, traffic sounds outside the window, etc., these noises have relatively weak penetration. A sound insulation felt with a thickness of about 2mm can already achieve a good blocking effect. It can reduce sound transmission without taking up too much space. However, for low-frequency noises, such as the vibration sound of elevator operation, the roar of large equipment, the sound of neighbors' subwoofers, etc., due to the long wavelength and strong penetration of low-frequency sound waves, it is necessary to choose sound insulation felt with a thickness of 3mm or more. It can even be used in layers, combined with materials such as sound insulation cotton and vibration-damping keels, to form a more严密 sound insulation barrier, preventing low-frequency noise from spreading through the resonance of walls and floors.

Secondly, consider the constraints of installation space. In home decoration, if the reserved space on walls, floors, or ceilings is limited—such as the renovation of thin walls in small apartments or sound insulation treatment behind wardrobes—too thick sound insulation felt may reduce the usable area. In such cases, thin versions of 1.2 - 2mm are more suitable, as they can balance basic sound insulation without affecting the overall layout. For scenarios with ample space, such as recording studios, home theaters, and equipment rooms, prioritize thick sound insulation felt of 3 - 5mm. You can even customize thicker specifications according to needs. By increasing the material density, the sound insulation coefficient is improved, ensuring that sound inside the space does not leak out and external noise is difficult to penetrate.

In addition, it is necessary to consider the budget and overall cost. Generally speaking, the thickness of sound insulation felt is proportional to its price; thicker materials will incur higher material and installation costs. If the budget is limited but basic sound insulation is required, a 2mm thickness offers better cost performance, as it can meet daily needs while controlling costs. For strict sound insulation requirements, such as in professional audio-visual rooms or environments needing extreme quiet, it is advisable to prioritize thickness and material quality (such as lead-containing or high-density rubber materials). Even if the cost increases, this avoids rework due to insufficient sound insulation later, which in turn saves long-term costs.

Finally, pay attention to the combination with other materials. Sound insulation felt is rarely used alone and often needs to be combined with gypsum boards, sound insulation cotton, vibration damping pads, etc. to form a sound insulation structure. At this time, the choice of thickness should consider the compatibility of the overall structure: for example, when paired with lightweight sound insulation cotton, a slightly thicker sound insulation felt can be used to enhance density; if the base layer is a thick solid wall, a thin sound insulation felt can help reduce sound reflection, and there is no need to excessively pursue thickness.

In conclusion, when making a choice, there's no need to blindly pursue thicker products. Instead, it should be determined based on the "noise intensity + space conditions + actual needs" of the specific scenario. If necessary, you can first measure the decibel value with noise detection equipment, and then make a targeted selection to achieve more precise and cost-effective sound insulation effects.