After the renovation of the three apartments was completed, it was discovered that the sound insulation cotton was not installed correctly. No wonder I was often woken up by the sound of my neighbors flushing water!

2026-05-18

Did you know that many families, when installing sound insulation cotton in their sewers, may appear to have covered them up, but in reality, they haven't done a proper job?

The same thing happened in my house. After several renovations, I suddenly realized that the sound insulation cotton had never been installed to the required standard.

No wonder, the sound of the upstairs neighbor flushing water can be clearly heard every day, which is extremely annoying.


So, how do you properly wrap sound insulation cotton? The following five details are crucial, so please pay attention!


First, ensure you choose the correct type of sound insulation cotton to avoid purchasing the wrong type and resulting in poor performance.

I have previously observed that the soundproofing materials used in many households do not actually achieve the expected soundproofing effect.

Many of these so-called soundproofing cotton products are pure black; they are actually thermal insulation cotton, not true soundproofing cotton. Genuine soundproofing cotton often has a silver casing to distinguish it from ordinary thermal insulation materials. This is especially important when purchasing soundproofing cotton, as choosing the right material is crucial for achieving ideal sound insulation results.


Even when carefully wrapped around sewer pipes, the soundproofing effect of pure black insulation cotton is extremely limited, practically a waste of money. Therefore, when purchasing soundproofing materials, it is essential to distinguish between genuine and counterfeit products to ensure that you choose materials that truly have soundproofing capabilities, thus avoiding wasting money and time.


2. The sound insulation cotton should be thick enough.

Choosing the right thickness for sound insulation cotton requires careful consideration. Too thin and the sound insulation effect is poor; too thick and the price is high. I personally recommend 2 cm thick sound insulation cotton, which performs excellently in both sound insulation and cost-effectiveness, and is more suitable than 1.5 cm thick. Therefore, when purchasing sound insulation cotton, you should choose a product with moderate thickness and superior performance based on your actual needs and budget.


III. Careful construction, paying attention to wrapping techniques

Wrapping soundproofing material yourself is more convenient and economical than hiring professionals. However, it is important to note that after wrapping, it is not recommended to simply secure it with tape, nor should glue be applied directly to the soundproofing material. To ensure long-term effective soundproofing, it is recommended to secure it tightly with cable ties to prevent corrosion caused by prolonged moisture.


Fourth, it is necessary to fully cover the area.

When wrapping sound insulation material, ensure complete coverage, especially for horizontal and vertical pipes. Horizontal pipes, as a major source of noise, should be the focus of the wrapping. Ensure these sections receive adequate sound insulation to guarantee the final soundproofing effect.


V. Increase damping effect for better performance.

If you still have concerns about the sound insulation effect, you can add damping sheets on top of the sound insulation cotton to enhance the soundproofing. Many experienced installers will add damping felt when wrapping the sound insulation cotton to further improve the soundproofing effect. This method can effectively block the sound of flushing water from upstairs, providing you with a quieter living environment.


VI. Final Summary

In summary, installing sound insulation is far more than a simple wrapping process. To ensure you're not disturbed by your neighbor's flushing noise, the five tips above are crucial. Is your sound insulation installed correctly? Make sure to follow these recommendations to bring peace and comfort to your living environment.