Pacmansh
2023-03-28 10:41:50
- #1
Good morning,
as I read in my other thread ( ), I have some problems with the planners of our terraced house. The positive thing currently is that the executing trades, i.e. the contracted construction company, are doing a good job. However, we have now encountered a serious problem concerning sound insulation. The situation is as follows:
We are buying a terraced house from the developer. The developer here is practically a special-purpose GmbH and not one of the big developers. The terraced house was built with a single-layer wall (30cm calcium silicate brick with high bulk density). We then demanded a sound insulation certificate. It was then found that the required sound insulation level is not met, and a 9.5cm facing shell is to be installed in order to achieve a value of 62dB. I have read several times that the recognized standard of technology is a double-shell construction and that in such a terraced house typically an increased sound insulation of 67dB is owed. A clarification appointment is expected to take place next week, for which I would like to prepare a bit and therefore ask for your assessment.
The contract with the developer states the following:
"The minimum requirements according to DIN 4109:2018 for building acoustics (sound insulation in interior rooms) are met."
Furthermore, it states:
"The seller undertakes to deliver the contractual object according to the construction description including building plans and the recognized rules of building engineering, turnkey and functional for the agreed residential use."
According to my research, however, the minimum requirements do not correspond to the recognized rules of technology, which raises the question of whether 62dB or 67dB sound insulation is required. Could you help me here?
as I read in my other thread ( ), I have some problems with the planners of our terraced house. The positive thing currently is that the executing trades, i.e. the contracted construction company, are doing a good job. However, we have now encountered a serious problem concerning sound insulation. The situation is as follows:
We are buying a terraced house from the developer. The developer here is practically a special-purpose GmbH and not one of the big developers. The terraced house was built with a single-layer wall (30cm calcium silicate brick with high bulk density). We then demanded a sound insulation certificate. It was then found that the required sound insulation level is not met, and a 9.5cm facing shell is to be installed in order to achieve a value of 62dB. I have read several times that the recognized standard of technology is a double-shell construction and that in such a terraced house typically an increased sound insulation of 67dB is owed. A clarification appointment is expected to take place next week, for which I would like to prepare a bit and therefore ask for your assessment.
The contract with the developer states the following:
"The minimum requirements according to DIN 4109:2018 for building acoustics (sound insulation in interior rooms) are met."
Furthermore, it states:
"The seller undertakes to deliver the contractual object according to the construction description including building plans and the recognized rules of building engineering, turnkey and functional for the agreed residential use."
According to my research, however, the minimum requirements do not correspond to the recognized rules of technology, which raises the question of whether 62dB or 67dB sound insulation is required. Could you help me here?