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ブログ 2018-12-04

Effect when sound insulation sheet is attached to the wall

Hello, this is Mr.I of Shizuka Co., Ltd..

Today’s article is about answers to the following questions, “Is the sound insulation sheet effective for piano and audio?”
original article in Japanese (日本語の記事)

The other day, from a customer living in a multi-family residence, we got a question saying “Can you attach sound insulation sheet to the wall and get a soundproof effect?”. We answered “That seems a bit difficult”.

~Sound insulation effect when you attach a sound insulation sheet to a wall~

Sound insulation sheets generally block and reduce sound by weight. If you use the sound insulation sheet alone in outdoor places and wall-free places, you can experience a certain degree of effect, but there is not much sound insulation effect even if you attach it to the wall of the room.

When insulating the sound by weight, it is said that it will not fall 5 dB unless it is twice the weight of the material to be attached to the wall. In other words, if the wall of the room is 15 kg / ㎡, it can not be reduced by 5 dB without building a 30 kg wall.

Since the weight of the sound insulation sheet is 1.5 to 3 kg per ㎡, if you look at the wall thickness and specifications of the apartment, you can make a rough judgment about whether or not the sound insulation sheet will be effective.

~Combining multiple materials~

The same can be said for the case of insulation with plaster board etc. other than sound insulation sheet. However, by combining multiple materials, there is also a method of reducing the entire range while suppressing the weight more than the sound insulation material. For example, the sound insulation sheet and gypsum board system are effective for sound isolation in the high frequency range, so if you are a voice or TV sound it will show some performance.

However, in the case of sound sources that generate bass such as audio and piano, weak frequency bands will leak even if they are double or triple. Therefore, if you attach sound absorbing material in front of the sound insulation sheet, and install it in order of damping material and sound insulation material with high effect on bass, it will be more effective. Because it exerts a different effect for each sound, it can make synergistic effect by integrating it.

Customers who are considering soundproof rooms of audio and piano should also check and examine the material of the walls of the room. Also, please note that if you are a construction shop, even if you use a highly effective material, sound leakage will occur if you do not care until gaps are processed.

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