Exterior wall with ETICS or exterior wall with lightweight plaster?

Hello everyone,

a great forum. I have already been able to gain many additional pieces of information. THANK YOU!

We want to build a 1.5-story house, 135m², gas/condensing boiler system with solar thermal collectors, underfloor heating on the ground floor and upper floor, fireplace flue. 2 rooms on the upper floor as well as the living room and guest room are oriented to the south. The plot (750m²) is located in a sparsely developed building area adjacent to a field. Kfw 70 is not planned. (or option?)

I am currently wondering whether I should build with:

24cm porous hollow bricks plus 8.0cm insulation (polystyrene rigid foam boards), reinforcement layer and top plaster

or with

36.5cm porous hollow bricks and 2.0cm lightweight plaster with mesh insert.


Could someone possibly give me a very general recommendation or explain the difference? Is the first variant sufficient? Do I understand the second variant as the monolithic construction method, whereby no insulation is necessary (due to the thickness of the bricks)?

We have unfortunately suffered a lot from mold and moisture damage in previous apartments. I have repeatedly read that the first variant often causes problems regarding diffusion moisture? For example, we sleep every night with the window open. What causes us less concern there? Is a ventilation system then a must?

I know I am not a professional. I also know that this should not necessarily be generalized, but I hope you can give me some tips or information.

Many thanks and best regards
Marcel

Hello Marcel,

a great forum. I was already able to gain many additional pieces of information. THANK YOU!

Then you should actually know that there is no "the" system or "the" stone.

For example, we sleep every night with the window open.

That is neither smart nor - especially from autumn to spring - healthy!

Rhenish greetings

Hello Marcel,


Then you should actually know that there is no "the" system or "the" stone.


That is neither smart, nor - especially from autumn to spring - healthy!

Rhineland greetings

Hello Bauexperte,

unfortunately I do not know, that is why I ask.

Thanks for your advice about being smart or healthy. I will talk about it with my wife.

Despite the information that there is no "the" system or "the" stone, are there still some hints, recommendations, advantages or disadvantages?

So how you do it is of course up to you... I have nothing against ETICS but if you can build with 36.5 I would do that...

Whatever you do, your house will be tight or should become tight if you plan to save energy costs in the coming years...

The ventilation system should actually become mandatory in new buildings... I personally would not buy or build a house without controlled residential ventilation...

By the way, an open bedroom window is not a way to get moisture out of the house... at most, only from the bedroom...

But mold and moisture can only be eliminated through heating and ventilation... only one of the two things is not enough...

and that's exactly what matters to me... only I just can't see any differences or simply don't know them...

of course you want to save energy costs.. but is the difference between both options really that big..?!

The difference is more philosophical in nature... both variants have similar room climate/temperatures/energy costs afterwards.