The pain that only those who have experienced it know is noise between floors. When you live in an apartment complex, you have to be considerate of your neighbors, but if the building is well-constructed, you start to wonder if it's right for us to take responsibility for noise between floors.

Quiet apartments without noise worries are no longer a story of the distant future. They are scheduled to be built starting next year.

This is the LHDB35 lab located in Sejong Special Self-Governing City. It's definitely running...

This is the LHDB35 lab located in Sejong Special Self-Governing City. It's definitely running on the upper floor, but it's so quiet. The average whispering sound in a quiet library is about 37 decibels, so this is very quiet. The reason it can be so quiet is because of this floor. It is a floor

that has been made using Grade 1 noise reduction technology. Class 1 technology has legally defined floor-to-floor noise standards, from Class 1 to Class 4. So, for example, in the case of Class 4, it is 49 decibels or less, and Class 1 is 30 decibels

or less, but the Class 1 technology makes noises that are 30 decibels or less audible. The main cause of noise between floors, floor impact noise, occurs when the impact of your foot on the floor changes into vibration, which is then transmitted as noise.

To solve this problem, you need to reduce the impact or block the vibration. The shock-reducing part is the cushioning material, and the vibration-blocking part is the ondol layer and the slab.

Here, the first-class noise reduction technology absorbs shocks with a composite buffer that contains polyester sound-absorbing and vibration-proofing materials instead of a conventional single buffer, and blocks vibrations with a slab that is thicker than a conventional slab.

In addition, the ondol floor uses high-density, high-strength mortar to block vibrations once more. From 2019 to July of this year, the number of complaints about noise between floors was a whopping 280,000. It is expected

that noise between floors can be significantly reduced if this first-class technology is utilized. The Korea Land and Housing Corporation developed this first-class noise reduction technology.

We are not an organization that develops any materials or anything like that. When we say that we have developed technology, you can think of it as verifying existing technologies and creating technology models.

So far, a total of 12 technologies have been recognized as Level 1 in inter-floor noise reduction in Korea, all of which are private technologies owned by Hyundai Engineering & Construction and Samsung C&T.

Most of them are owned by large construction companies and are often patented for each house type, making it difficult for other small and medium-sized private construction companies that do not have their own research labs to use them.

In addition, it has not yet been specifically verified whether construction for full adaptation is realistically possible and how much

the construction costs will increase accordingly.  Also, since materials from certain companies may have monopoly issues, there were limits to LH immediately applying private technology to the design.

So, we thought we should develop technology suitable for our field, LH. That's why we proceeded.

I think our biggest advantage is the many sites we can use as field test beds.  We currently manage over 100 sites, many of which allow us to directly verify and demonstrate various technologies.

Utilizing this advantage, the staff who began developing Level 1 noise reduction technology in 2022 started by incorporating various commercially available materials.

To test and measure on-site, a quiet environment is necessary.  Since it's noisy during the day, testing was conducted from 5 p.m. to 9 or 10 p.m.

In summer, testing required closed doors and no air conditioning, leading to profuse sweating. This was challenging.  47 technology models were created, and 1,347 performance tests were conducted to verify them.

I don't think anyone complained, but it must have been difficult.  Despite this, the work was completed well.

After two years of research, I discovered a new buffer, constructed it, and increased the slab thickness to 250.  This achieved a first-class rating of 36 decibels.

This idea was provided by LH, who also offered government financial support to reduce the burden on consumers by minimizing costs.

This was possible thanks to developing technology that meets the first-class inter-floor noise level standard while using a thinner floor to reduce consumer costs.

We plan to share this first-class technology model with private construction companies through the inter-floor noise technology market, allowing them to freely utilize it.

We've also completed Korea's largest inter-floor noise testing facility, enabling private construction companies to develop their own first-class noise reduction technologies.

We had to develop and certify the technology before supplying it to the site, but it...

It was difficult because it took about a year and a half to two years to get the certification. However, we are currently working on shortening the certification period by establishing

an innovation pilot program, and are currently opening it primarily to companies developing Level 1 technology. We are working on promoting and supporting Level 1 development at the experience facility.

This testing facility's name reflects our commitment to surpassing DB 35 Lab 1st Class. In the future, this testing facility will become a test bed for various small and medium-sized construction and material companies, and a space where new technologies can be pre-approved.

They say this testing facility will soon be full. From a public institution's perspective, we feel it's late, but if we can alleviate any inconvenience and discomfort for the people,

we see that as our role. Although it is late, we will work harder to provide comfortable homes without noise between floors.

I wonder if a comfortable daily life without worrying about noise between floors can truly become a reality. Please also watch the video recommended by the PD who created this video.

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