ᐅ Is this wall insulation setup suitable for a KfW 70 energy-efficiency house?

The plan is for a KfW 70 house. The plan includes 17.5cm (7 inch) Ytong blocks with 16cm (6 inch) Styrofoam insulation. The windows are triple-glazed. Is this okay?

Hello,

The planning of the wall structure can only be considered in the context of the entire building design. Whether it is acceptable or not can only be answered by your planner 😉

This is not a matter of personal preference.

Best regards

What information are you missing? It clearly states above what I want to achieve: wall, window insulation, KfW 70 ....

Livestrong schrieb:
What information do you feel is missing? It’s clearly stated above what I want to achieve: wall, window insulation, KfW 70...

You don’t really expect anyone here to give you a reliable answer on whether you can build a KfW 70 standard with this wall structure and these windows, or if it’s the right wall design for YOUR house, do you?

As mentioned, only your designer or architect can answer that. They know your house, understand what heating system you want or need to use, or should reasonably consider. They are familiar with your preferences and requirements. Do you prioritize sound insulation? Do you require summer heat protection? How are the other building components of your house designed and dimensioned? Does it have to be external thermal insulation composite system (ETICS) / external wall insulation? Do you have a basement? Heated? Unheated? Questions, questions, just questions...

No one can tell you if this particular wall structure is the right one. It can be suitable but doesn’t have to be. One person prefers aerated concrete blocks, another doesn’t. Some favor bricks, others don’t. Some prefer sand-lime bricks, others don’t. Some opt for ETICS, others don’t. Every building material has advantages and disadvantages. You need to know which properties you value most, then you or your designer can select the right material. The dimensions then follow from the energy requirements.

Best regards

I am an amateur and have to rely on my partner. The suggestion was to increase the insulation to 16cm (6 inches). The basement is unheated. The 1.5 floors will have underfloor heating. The house was offered with the option to make changes. Since I value good insulation, I was advised to go with 16cm (6 inches) and triple glazing. That is why I am asking. Unfortunately, I don’t have any more information. I have no preference regarding the type of block, but ytong is widely used.

...You need to know which properties are important to you, then you or your planner can choose the right building material. [/QUOTE] The initial question already makes it clear: there is probably not much thought or planning involved here, and the intention is likely to buy quickly.