Hello,
As mentioned in the title, we are building with Ytong to achieve KfW55 standard.
Now our construction company has offered to build with 36.5 cm (14 inches) Ytong blocks instead of 24 cm (9.5 inches) Ytong plus 12 cm (5 inches) of full thermal insulation.
Advantages according to the construction company:
1. All values for KfW55 are met just the same.
2. Fastenings on the exterior wall, e.g. satellite dish, awning, etc., would be much easier to install because it’s solid masonry directly, without soft insulation.
3. Our site manager considers the insulation a sort of "hazardous waste" from his point of view, as its production and disposal are quite energy-intensive...
Disadvantages: none?? Price-wise it would make no difference for us.
What do you think?
Especially point 2 appeals to me...
Point 3 is just a personal opinion and therefore secondary for now.
Thanks and best regards to everyone!
As mentioned in the title, we are building with Ytong to achieve KfW55 standard.
Now our construction company has offered to build with 36.5 cm (14 inches) Ytong blocks instead of 24 cm (9.5 inches) Ytong plus 12 cm (5 inches) of full thermal insulation.
Advantages according to the construction company:
1. All values for KfW55 are met just the same.
2. Fastenings on the exterior wall, e.g. satellite dish, awning, etc., would be much easier to install because it’s solid masonry directly, without soft insulation.
3. Our site manager considers the insulation a sort of "hazardous waste" from his point of view, as its production and disposal are quite energy-intensive...
Disadvantages: none?? Price-wise it would make no difference for us.
What do you think?
Especially point 2 appeals to me...
Point 3 is just a personal opinion and therefore secondary for now.
Thanks and best regards to everyone!
K
Knallkörper6 Mar 2017 11:15Schischka schrieb:
It also makes no energetic sense to apply thermal insulation from the outside and then have to heat the entire masonry.What a nonsense!
Schischka schrieb:
The highly praised glass wool in the cavity absorbs water and transfers it to the sand-lime brick masonry.What water should it absorb? Glass wool does not absorb anything because it has no capillary action!
Schischka schrieb:
There are whole puddles behind the facing brick on the vapor barrier.Then the vapor barrier is not installed correctly!
Schischka schrieb:
The highly praised glass wool in the air gap... does not belong there – the air gap is called an air gap for a reason. It can border an insulation layer but should not be filled with it (except for blown-in insulation, since the air gap does not necessarily have to be “solid”).
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K
Knallkörper6 Mar 2017 12:23Schischka schrieb:
From an energy perspective, it doesn’t make sense to install thermal insulation on the outside and then heat the entire masonry wall.What nonsense!
11ant schrieb:
... doesn’t belong there – the air gap is called an air gap for a reason. It can be adjacent to an insulation layer but should not be filled with it (except by blown-in insulation, since the air gap doesn’t necessarily have to be solid).Well, what else is cavity insulation than an air gap filled with mineral wool?
S
Schischka6 Mar 2017 12:25Regarding ETICS insulation.
Yes, it is considered hazardous waste and is no longer accepted by most disposal facilities. The material is often of such poor quality that you can see it deteriorate—everything always has to be cheap. What many people don’t know is that these materials become liquid when exposed to heat and can run down the walls. Temperatures as low as 50°C (122°F), which can be reached with direct sunlight on dark facades even in Germany, are enough. This is certainly a slow process and not visible, but it does happen.
Furthermore, these insulation materials are not as durable as monolithic ones. Many building experts claim that after just 20 years, they lose their thermal insulation properties significantly and become ineffective.
As already mentioned, there are only disadvantages when it comes to structural properties. You can’t attach anything reliably—or only with difficulty. If a child throws a metal shard at the wall, the facade is damaged; a toy tractor hitting the corner also leaves a mark.
Yes, it is considered hazardous waste and is no longer accepted by most disposal facilities. The material is often of such poor quality that you can see it deteriorate—everything always has to be cheap. What many people don’t know is that these materials become liquid when exposed to heat and can run down the walls. Temperatures as low as 50°C (122°F), which can be reached with direct sunlight on dark facades even in Germany, are enough. This is certainly a slow process and not visible, but it does happen.
Furthermore, these insulation materials are not as durable as monolithic ones. Many building experts claim that after just 20 years, they lose their thermal insulation properties significantly and become ineffective.
As already mentioned, there are only disadvantages when it comes to structural properties. You can’t attach anything reliably—or only with difficulty. If a child throws a metal shard at the wall, the facade is damaged; a toy tractor hitting the corner also leaves a mark.
K
Knallkörper6 Mar 2017 13:10Schischka schrieb:
On the topic of EIFS insulation.We were just discussing cavity wall construction with cavity insulation, weren’t we? Otherwise, I basically agree with you on the topic of EIFS.
Knallkörper schrieb:
What else is cavity insulation than an air space filled with mineral wool?Cavity insulation is just that. It’s not a bad thing, but it is something different. An air space serves a purpose; it’s a deliberate design choice. Traditionally, its function is to act as a hollow layer, sometimes combined with blown-in insulation materials that fill or pass through it. If you rethink the design and prefer to completely fill the cavity, the air layer is repurposed. However, the original term no longer really applies, as air is an integral structural component of an air cavity. Air is more than “nothing”; as a “cushion,” it serves a function.
In the current insulation trend, understanding has regressed, as only solid materials are attributed specific properties. When retrofitting is considered necessary, insulation materials are added to spaces that were originally air cavities. In everyday language, the original name of the layer usually sticks, even though its technical meaning has changed. So, if I point out a difference here, you can see it as a matter of semantics.
Those who installed air cavities 20 or 30 years ago did so intentionally, not out of ignorance. Today, other methods are in vogue, but filling a former air cavity does not always achieve the intended effect.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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