ᐅ Which Material Is Best for Blown-In Insulation? – Experiences?

Benutzer 1002 schrieb:

How can I further explain the large cavity?

By sharing the plans. Or if you have already seen the cavity—for example, during window replacement.

In older buildings, the typical cavity is 3-4cm (1-1.5 inches) when there is only one air layer. According to current standards, 15cm (6 inches) is the maximum— but that would be with cavity insulation.
What is the total wall thickness? From that, you might be able to estimate the cavity width. You could, for example, have a Lippisches Luftmauerwerk (a historic type of air masonry) if the total thickness is around 31-33cm (12-13 inches). Historically, this would be the only reason to have such a wide cavity.

nordanney schrieb:

By sharing the plans or, for example, having already seen the cavity during a window replacement.

The typical case for older buildings is a cavity of 3-4cm (1-1.5 inches) if there is only one air layer. According to current standards, 15cm (6 inches) is the maximum—but then with cavity insulation.
What is the total thickness of your wall? From that, the thickness of the air cavity can possibly be derived. You might also have a “Lippisches Luftmauerwerk” with a total thickness of about 31-33cm (12-13 inches). Historically, that would be the only likely reason for such a large air cavity.

That is strange. As I already mentioned, I was present during the drillings, but I will check again during the window replacement.
According to the construction description, this is a cavity wall 36.5cm (14 inches) thick.

Nothing further is visible in the plan:

User 1002 schrieb:

That’s strange, as I mentioned before, I was present during the drillings, but I will double-check this during the window replacement.
According to the construction description, it is a hollow masonry wall, 36.5 cm (14.4 inches) thick.

I’ll quote myself from the supposed cross-post:

It is possible that the sample core from the test drilling contains amounts of material that indicate roughly a quarter of the wall thickness as the sum of the hollow chambers.
In such a case, injecting insulation would obviously be completely unrealistic. I recommend an investigation, for example with an endoscopic inspection camera.

User 1002 schrieb:

There is nothing else visible on the plan:

The plan shows windows whose installation position would lie within the plane of the air cavity (?)

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Benutzer 1002 schrieb:

There’s nothing else visible in the plan either:

That only helps you to a limited extent (the installation position of the windows is of course interesting) – you could check the existing windows to see how they were installed.

Here are two more examples of how buildings were commonly constructed in the past:

This is a 36.5cm (14.4 inches) wall with pumice concrete and an 11.5cm (4.5 inches) facing layer without an air gap from the mid-1960s (according to the building description, however, it is hollow brick).

Extension on the same house from 1980:

36.5cm (14.4 inches) from actual hollow bricks, but with 3cm (1.2 inches) insulation before the facing brick is applied. So 24cm (9.4 inches) hollow brick + 3cm (1.2 inches) insulation + 11.5cm (4.5 inches) facing brick. Don’t be surprised, this does not add up to 36.5cm (14.4 inches).