When choosing the thickness of sound insulation felt, it is necessary to make a comprehensive judgment based on the noise situation of the actual scene, the installation conditions, and the sound insulation requirements. The following are more detailed reference guidelines:
First, consider the type and intensity of the noise . For mid-to-high frequency noises in daily life, such as talking, television sounds, and traffic noise outside the window, these noises have relatively weak penetrating power, and a 2mm thick soundproofing felt can provide good blocking, reducing sound transmission without taking up excessive space. However, for low-frequency noises, such as the vibration of elevators, the roar of large equipment, and the subwoofer from a neighbor's house, due to the longer wavelength and stronger penetrating power of low-frequency sound waves, it is necessary to choose soundproofing felt of 3mm or more thickness, or even use them in layers, combined with soundproofing cotton, vibration-damping joists, and other materials to form a more robust sound barrier, preventing low-frequency noise from resonating through walls and the ground.
Secondly, consider the limitations of installation space . In home renovations, if the reserved space on walls, floors, or ceilings is limited, such as in the renovation of thin walls in small apartments or soundproofing behind wardrobes, overly thick soundproofing felt may reduce the usable area. In this case, a thinner version of 1.2-2mm is more suitable, as it can provide basic soundproofing without affecting the overall layout. For scenarios with ample space, such as recording studios, home theaters, and equipment rooms, prioritize 3-5mm thick soundproofing felt. Even thicker specifications can be customized to increase the sound insulation coefficient by increasing the material density, ensuring that sound does not leak out of the space and that external noise is difficult to intrude.
In addition, consider your budget and overall costs . Generally speaking, the thickness of soundproofing felt is directly proportional to its price; thicker felt will have higher material and installation costs. If your budget is limited but you need basic soundproofing, 2mm thick felt offers better value, meeting your daily needs while controlling costs. If you have stringent soundproofing requirements, such as in a professional home theater or an environment requiring extreme quiet, it is recommended to prioritize thickness and material (such as lead-containing or high-density rubber). Even if this increases costs, it will prevent rework due to insufficient soundproofing later, thus saving on long-term costs.
Finally, pay attention to its compatibility with other materials . Sound insulation felt is rarely used alone; it is often combined with gypsum board, sound insulation cotton, vibration damping pads, etc., to form a sound insulation structure. In this case, the thickness selection needs to consider the compatibility with the overall structure: for example, when combined with lightweight sound insulation cotton, a slightly thicker sound insulation felt can be used to increase 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 short, when choosing, you don't need to blindly pursue the thickest possible thickness. Instead, you should determine the thickness based on the specific scenario's "noise intensity + space conditions + actual needs." If necessary, you can first measure the decibel value through noise detection equipment and then make a targeted selection to make the sound insulation effect more accurate and economical.
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