Exterior wall insulation or perimeter insulation? Change by general contractor

So with the U-value calculator available on the internet, anyone can check what difference it makes. Is a (in this case well-suited) concrete core activation planned for you? It is true, by reducing the insulation thickness you have more losses towards the ground. This is compensated for mathematically by the better external insulation in order to stay within the KfW standard. How is the overall floor construction planned? I also find 150mm very tight. The rest is in my opinion the optimum with brickwork..

150mm Ytongg.. The wall construction is already junk, I wouldn't even bother with such insulation details, but rather change the GÜ.

Here with us I often see the combination of sand-lime brick and thermal insulation, Ytong then in monolithic wall construction. However, I would have concerns about such a thin stone. Once the craftsmen come and install their sockets and other cables and chisel into the walls, such thin walls will soon be pierced. Why not a bit thicker and maybe less thick insulation?

Best regards
Sabine

150mm Ytong is only rubbish if you think of the highly thermal insulating stones. These are not used in combination with additional insulation but rather the firmer, less insulating stones. Whether this works is the responsibility of the structural engineer. In total, fairly thin wall structures with a low U-value result, which are cost-effective. But it wouldn't be my choice either.

With 150 mm walls, however, you already get problems with horizontal chasing. I don’t know if that would even be permissible. The pressure distribution across the cross-section becomes eccentric, regardless of the masonry material.

Additionally, there are still hundreds to thousands of dowels for the clinker shell in the masonry. Statics can represent a lot, but I would prefer a construction that is not statically built on a narrow edge.

The rest is, in my opinion, the optimum with clinker..

The facing shell instead of slip bricks, yes, but I consider a 1 cm finger gap to be a renamed tolerance.

150mm Ytongg.. The wall structure is already rubbish, I wouldn’t even worry about such insulation details but rather change the contractor.

Statically, many things are possible, but I would prefer a construction that is not built on a narrow ridge.

Once the craftsmen come and install their sockets and other cables and chip open the walls, such thin walls will soon be perforated.

I agree.

Why not a bit thicker and maybe less thick insulation?

Someone probably wanted to make a fully developed facing shell but still not exceed the half-meter wall thickness mark. Reducing the thickness of the insulation costs U-value, so the question to the structural engineer is: "Can you manage that with stiletto-thin walls?" For me, that exactly affects the trust in the solidity that the clinker is supposed to inspire.