ᐅ Sound Insulation According to VDI Guideline 4100 & DIN 4109 in Prefabricated House Construction

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.

What are your reasons for focusing so much on soundproofing? The average homeowner gets along very well with today’s prefabricated houses (timber frame construction). Are you building in a flight path or in a particularly noisy area?

Well, I'm simply interested in what is technically achievable as a standard nowadays.

rainario1 schrieb:

Well, I’m simply curious about what technical standards are achievable nowadays.

In terms of sound insulation, you can equip a prefabricated house just like a bunker – this is state of the art technology. You just need to use the right materials (this involves not only the wall construction but also a holistic approach, for example, including the windows). It’s all a matter of money – whether it’s practical to deviate from standard basic specifications is another question.

rainario1 schrieb:

Demanding sound insulation class II or even III according to guideline 4100 can only be achieved with disproportionately high additional effort (and corresponding extra costs)?!

It depends on who is supposed to implement it: Typical prefab home manufacturers (like Hanse Haus, Weberhaus, etc.) would have to go to considerable lengths to meet the VDI 4100 guidelines from 2012, which often requires individual and therefore complex and costly “special solutions” for these companies. However, many (albeit mostly higher-end) architects believe that, with proper planning and execution, the 4100 guideline values can be achieved without significant additional effort. But their standards and expectations are usually different from those of prefab home builders.

rainario1 schrieb:

had a landmark ruling in 2007 concerning semi-detached houses

I am not familiar with the exact wording of the ruling, but I assume it deals with sound insulation between two semi-detached houses/dwelling units, not with noise protection from outside or sound transmission within the same dwelling. Meeting the 4100 guideline between two semi-detached houses is not rocket science if the current state of the art is observed.

rainario1 schrieb:

I want to have two semi-detached houses built to KfW40 standard in timber frame construction.

By whom? A “classic, large” prefab home manufacturer or an architect with general contracting? What does the separating wall look like?

rainario1 schrieb:

That’s great!

The topic of construction specifications is tricky and critical. If you value something, make sure it is agreed upon in writing.

rainario1 schrieb:

Partially using Knauf Diamant boards for the interior walls and a sound-decoupled ceiling

That would improve sound insulation within a single dwelling unit but have little meaningful effect on sound insulation between units. But: If the planning (and also the execution) is fundamentally flawed, even the best materials with excellent theoretical properties won’t help—especially in prefab construction.

rainario1 schrieb:

2. Are there any prefab home manufacturers (timber frame construction) known for being particularly skilled in sound insulation?

I don’t know of any; the standard level is similarly modest across all major manufacturers. Very few build semi-detached houses, and good sound insulation is rarely achieved here.

rainario1 schrieb:

DeGA sound insulation certificate

Forget that. Agree explicitly in your construction contract which standard is to be met (between dwelling units, within a unit, against external noise, etc.). If this is important to you, involve an acoustics expert already during planning, who can also conduct verification measurements after completion. This usually costs a mid four-figure amount, depending on scope.

nordanney schrieb:

The “average” home builder gets along very well with today’s prefab houses (timber frame construction).

He wants a semi-detached house. That is outside the expertise range of almost all prefab manufacturers.

nordanney schrieb:

You just have to use the right materials

That’s a misconception. Especially in timber frame or timber panel construction, poor planning and workmanship cannot simply be compensated for with “premium” materials. This works very well in solid construction, but the prefab concept tolerates almost no mistakes acoustically. The credo: It is easier to build a solid house with good sound properties than an equivalent prefab house.

MayrCh schrieb:

This is a misconception. Especially with timber frame or timber panel construction, poor planning and execution cannot simply be compensated for by using "premium" materials. This works very well with solid construction, but the prefabricated house concept allows almost no room for error when it comes to building acoustics. The principle is: It is easier to build a solid house with good acoustic performance than an equivalent prefabricated house.

I did not want to downplay the importance of planning! That is certainly true, and it must be done properly.