ᐅ Sound Insulation According to VDI Guideline 4100 & DIN 4109 in Prefabricated House Construction
Created on: 3 May 2020 21:30
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rainario1
Hello everyone,
I wasn’t able to find much or any information about the technical standards for sound insulation from prefab house manufacturers (timber frame construction) on their websites or in their building specifications. Neither regarding sound insulation against external noise (winds, traffic, etc. according to DIN 4109) nor sound insulation against neighboring buildings (where the stricter VDI 4100 standard should possibly apply).
Rhetorical question: Why is that?
...I’m starting to guess: I fear that the relatively demanding sound insulation levels II or even III of the VDI 4100 guideline can only be achieved with disproportionately high additional effort (and correspondingly higher costs)?
On the other hand, I found this in the wiki:
In a landmark ruling in 2007 concerning semi-detached houses, the Federal Court of Justice established that sound insulation levels II and III of the VDI guideline 4100, or the enhanced sound insulation according to Supplement 2 of DIN 4109, are to be regarded as generally accepted state-of-the-art standards, whereas level I or the DIN 4109 standard alone is not. (Federal Court of Justice, ruling from June 14, 2007 – VII ZR 45/06).[6]
The specification agreement did not have to explicitly mention the expected sound insulation, so sound insulation exceeding the previous DIN criteria becomes a normal part of the construction contract, provided it can be executed according to the generally accepted state-of-the-art standards. Uncertainties regarding the generally accepted standards were resolved by later Federal Court of Justice decisions, making high-quality sound insulation the default assumption in new builds. (Source: Wikipedia)
There are additional rulings pointing in the same direction.
I want to build two semi-detached houses to KfW40 standard using timber frame construction.
1. These should then be constructed “at least according to VDI 4100 SIL II or Supplement 2 of DIN 4109 without further mention in the building specifications,” right? That would be great!
But I don’t want to be that naive... I can’t find anything about this in the building and service specifications, and when I asked the manufacturer, they offered to install additional Knauf Diamant boards partially on the interior walls and a sound-decoupled ceiling (extra cost approximately 5000 euros per semi-detached house).
They say the stairs from the ground floor to the top floor are supposedly decoupled as standard.
I find that interesting.
2. Is there a prefab house manufacturer (timber frame construction) that is generally known to be particularly experienced in the area of sound insulation?
Having someone include a sound insulation certificate according to DeGA Recommendation 103 (2018) in the construction contract would be incredible (and probably just as unrealistic as uneconomical?)...
3. A building acoustician issues such a DeGA sound insulation certificate, but what does that report typically cost?
Does anyone have experience with this?
I won’t post a link to the DeGA Recommendation 103, but they have published quite a bit on this topic.
PS: As you might guess, I’m trying to resolve the apparent contradiction between timber frame construction and excellent soundproofing... maybe other builders face similar challenges.
I wasn’t able to find much or any information about the technical standards for sound insulation from prefab house manufacturers (timber frame construction) on their websites or in their building specifications. Neither regarding sound insulation against external noise (winds, traffic, etc. according to DIN 4109) nor sound insulation against neighboring buildings (where the stricter VDI 4100 standard should possibly apply).
Rhetorical question: Why is that?
...I’m starting to guess: I fear that the relatively demanding sound insulation levels II or even III of the VDI 4100 guideline can only be achieved with disproportionately high additional effort (and correspondingly higher costs)?
On the other hand, I found this in the wiki:
In a landmark ruling in 2007 concerning semi-detached houses, the Federal Court of Justice established that sound insulation levels II and III of the VDI guideline 4100, or the enhanced sound insulation according to Supplement 2 of DIN 4109, are to be regarded as generally accepted state-of-the-art standards, whereas level I or the DIN 4109 standard alone is not. (Federal Court of Justice, ruling from June 14, 2007 – VII ZR 45/06).[6]
The specification agreement did not have to explicitly mention the expected sound insulation, so sound insulation exceeding the previous DIN criteria becomes a normal part of the construction contract, provided it can be executed according to the generally accepted state-of-the-art standards. Uncertainties regarding the generally accepted standards were resolved by later Federal Court of Justice decisions, making high-quality sound insulation the default assumption in new builds. (Source: Wikipedia)
There are additional rulings pointing in the same direction.
I want to build two semi-detached houses to KfW40 standard using timber frame construction.
1. These should then be constructed “at least according to VDI 4100 SIL II or Supplement 2 of DIN 4109 without further mention in the building specifications,” right? That would be great!
But I don’t want to be that naive... I can’t find anything about this in the building and service specifications, and when I asked the manufacturer, they offered to install additional Knauf Diamant boards partially on the interior walls and a sound-decoupled ceiling (extra cost approximately 5000 euros per semi-detached house).
They say the stairs from the ground floor to the top floor are supposedly decoupled as standard.
I find that interesting.
2. Is there a prefab house manufacturer (timber frame construction) that is generally known to be particularly experienced in the area of sound insulation?
Having someone include a sound insulation certificate according to DeGA Recommendation 103 (2018) in the construction contract would be incredible (and probably just as unrealistic as uneconomical?)...
3. A building acoustician issues such a DeGA sound insulation certificate, but what does that report typically cost?
Does anyone have experience with this?
I won’t post a link to the DeGA Recommendation 103, but they have published quite a bit on this topic.
PS: As you might guess, I’m trying to resolve the apparent contradiction between timber frame construction and excellent soundproofing... maybe other builders face similar challenges.
rainario1 schrieb:
It is difficult for the client to prove what exactly is "owed" if nothing specific has been agreed upon. If nothing specific has been agreed, the standard that applies is what is approved and implemented by the building authorities, namely sound insulation according to DIN 4109 (version depending on the federal state). Beyond that, whatever is contractually agreed applies; anything below the requirements of DIN 4109 (version depending on the federal state) is considered a defect.
rainario1 schrieb:
The measurable TARGET often remains unclear to laypeople in reality. And that makes me uneasy. Basically, the target (desired condition) is what has been agreed. If nothing is agreed: the state of the art, building authority introduction/approval applies.
rainario1 schrieb:
that SST III means an extremely increased effort It was never said to be extreme. It means additional effort, primarily regarding proper planning, execution, and choice of materials. Few are able or willing to take on this “extra effort,” which rarely reaches an “extreme” level.
rainario1 schrieb:
1. 12.5mm diamond GKFi
2. Vapor retarder
3. 15mm OSB board
4. 110mm mineral fiber insulation in a 110/60mm timber stud (spacing <625mm)
5. 2 layers of 18mm gypsum board GKFi each
6. 50mm air gap up to the boundary of the semi-detached house Unusual: a timber stud wall as a party wall between dwellings. I have only experienced those as solid walls, usually 200 or 240mm calcium silicate blocks with a thermal conductivity of 2.0.
That means, with your neighbor, you have a total of less than 130mm of gypsum board/wood fiberboard for both party walls combined, whereas the wall thickness is about 360mm? That’s ambitious. It’s obvious that the result can’t be much more than the minimum requirement.
rainario1 schrieb:
Instead, mineral fiber insulation everywhere where there would be air? That is possible. Effectiveness is usually marginal. The “air gap” toward the adjoining semi-detached house is intended mainly to prevent structural-borne sound bridges. With this wall construction, that would be critical; therefore, I would rather avoid polystyrene just to be safe, and choose something softer instead.
rainario1 schrieb:
Which SST this achieves remains unclear to me, As long as nothing else is agreed or owed, I would say: minimum requirements according to DIN 4109, valid version depending on the federal state.
R
rainario113 May 2020 23:42Let's see what the general contractor says if I want a solid partition wall. They’ll probably be quite happy with me... and so will my wallet. But if it’s going to be a timber stud wall anyway, I’d rather not completely fail when it comes to sound insulation from the neighbor...
rainario1 schrieb:
If you’re going with timber studs, it’s better not to run into major issues with soundproofing towards the neighbor... I see soundproofing there...
rainario1 schrieb:
Construction layers in bullet points, from inside to outside (for a semi-detached house):
1. 12.5mm (0.5 inch) diamond gypsum plasterboard with moisture resistance
2. Vapor retarder
3. 15mm (0.6 inch) OSB board
4. 110mm (4.3 inch) mineral wool insulation in a 110/60 mm (4.3/2.4 inch) timber stud frame (spacing <625mm (25 inches))
5. Double layer of 18mm (0.7 inch) gypsum plasterboard with moisture resistance
6. 50mm (2 inch) air gap up to the boundary of the semi-detached unit ... actually none listed, or only represented by the 5 cm (2 inch) “empty space” decoupling from the neighboring half. And are the two layers of 18 mm (0.7 inch) gypsum plasterboards supposed to provide the entire fire protection?
rainario1 schrieb:
What the general contractor says if I want a solid separating wall. I suspect: your house will be about 20 cm (8 inches) narrower if built with concrete, or 24 cm (9.5 inches) narrower if built with sand-lime bricks.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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rainario114 May 2020 00:3211ant schrieb:
I don’t see any soundproofing listed here...
... or only as the 5 cm (2 inches) gap representing decoupling from the neighboring unit. And the two layers of 18 mm (0.7 inch) gypsum board are supposed to provide all the fire protection?
I must admit I wasn’t that surprised, I had already suspected this.
Correct, item 1 is F30B and item 5 is F90B.
By the way, I strongly suspect that you and your house provider were talking past each other. The described wall construction seems to me to be the usual setup for an exterior wall, which on the shared side (assuming both halves are fully adjacent) is less sensitive in terms of U-value and without exterior plaster. You are referring to a "party wall," which, as far as I know, has not been used in row or semi-detached housing since around 1980. On the other hand, it doesn’t seem like you mean a fire wall—so I conclude that you legally intended not a semi-detached house, but a two-family house designed as a semi-detached house with two units on a single, undivided property. In that case, a prefabricated house builder would plan a multi-family building with apartment division walls—here only "decorated" to have double layers for separating the ceiling sections on one hand, and a 5cm (2 inch) separation joint between them on the other. I see this is likely to cause you to receive something different from what you believe you ordered.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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