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!
Your builder is clearly right. Consider what advantage there is in gluing thin polystyrene insulation to the thin aerated concrete blocks and then plastering over it, when you could have solid blocks and plaster directly on them.
Any savings on materials, because thin aerated concrete plus polystyrene insulation is cheaper than thick aerated concrete, will be lost again in labor costs. And yes, it is a lower-quality wall construction to use insulation material instead of solid block. The wall is more fragile, fixing things to it is more difficult, the risk of algae growth is higher, and the insulation material is also highly flammable. It also absorbs moisture...
Any savings on materials, because thin aerated concrete plus polystyrene insulation is cheaper than thick aerated concrete, will be lost again in labor costs. And yes, it is a lower-quality wall construction to use insulation material instead of solid block. The wall is more fragile, fixing things to it is more difficult, the risk of algae growth is higher, and the insulation material is also highly flammable. It also absorbs moisture...
tomtom79 schrieb:
Ytong is all well and good, but what about sound insulation?a) What exactly is the concern about sound insulation?
We once had an apartment in a Ytong building located on a busy main road, had good hearing, and still slept very well.
b) In relation to the thread topic, I don’t understand the question: do you seriously consider the sound insulation of expanded polystyrene (EPS) a good alternative?
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What you experienced and felt is honestly irrelevant to me; it is a fact that Ytong is poor for sound insulation. That is why I wanted to raise awareness among the builders.
However, I can add some more information about Ytong. Ytong requires a specific kind of plaster, which unfortunately tends to crack. Because of this, insulation is often used to visually reduce the cracks.
However, I can add some more information about Ytong. Ytong requires a specific kind of plaster, which unfortunately tends to crack. Because of this, insulation is often used to visually reduce the cracks.
Regarding all the (supposedly) negative aspects of ETICS mentioned by nordlys, there are corresponding counterarguments. Building materials naturally have their pros and cons, and Ytong is by no means exempt from this.
A key advantage of ETICS is its unmatched thermal insulation. However, Ytong also provides insulation and, in the planned building, apparently offers sufficient performance to achieve approximately KfW 55 standard with a similar wall thickness. Therefore, I would not be strongly deterred from using Ytong exclusively. The only general reason against this monolithic construction method is the thermal bridges inherent to the design. But if the KfW standard is already met, perhaps it is reasonable to accept this as is.
A key advantage of ETICS is its unmatched thermal insulation. However, Ytong also provides insulation and, in the planned building, apparently offers sufficient performance to achieve approximately KfW 55 standard with a similar wall thickness. Therefore, I would not be strongly deterred from using Ytong exclusively. The only general reason against this monolithic construction method is the thermal bridges inherent to the design. But if the KfW standard is already met, perhaps it is reasonable to accept this as is.
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