Wooden house - interior walls made of stone?

Hello,

I am currently planning a single-family house (bungalow, about 180 sqm) which is to be built using solid wood construction. With wooden houses, especially KfW insulated houses, it is said that they should be easy to heat quickly. Due to the lack of mass, I was told, however, that they cool down quite quickly again. To "counteract" this, a question came up a few days ago during a discussion about what it would be like if the interior walls were made of [Kalksandstein] or [Ziegel]?

We didn’t get very far with that. So here is the question:

Does it make sense to build the outer shell of a house from solid wood and one or more interior walls from stone?

Maybe someone can say something about that.

Thanks in advance.

Best regards

Why? This thesis is completely new to me. A wooden house has measurements after all. Presumably, you still have insulation on your house. Cooling down takes ages due to the airtight shell and insulation. Heating up when it has really gotten cold, e.g. heating/ventilation failure, takes time, which has nothing to do with the wooden house but with the fact that the supply temperatures are lower.

I am currently planning a single-family house (bungalow, about 180 sqm) which is to be built using solid wood construction. With wooden houses, especially KfW-insulated houses, it is said that they are easy to heat quickly. Due to the lack of mass, I was told that they cool down quite quickly again. [...] Does it make sense to make the outer shell of a house out of solid wood and one or more interior walls out of stone?

Your idea is feasible with some effort and at least for a freely spanning roof truss. It is also not so absurd that one would have to laugh to death when reading it. But it is still naive enough that it seems advisable to me that you review other key parameters you have already "set" in your mind and preferably discuss them here as well. Incidentally, you have been given incorrect information: especially with solid wood houses, the latency time of heat transfer is very high – even "longer than the standard allows," so it is more difficult for manufacturers than with other wall structures to determine the U-value in the laboratory. So please feel invited to a broad discussion with us first: my advice would be that you start an introduction thread and "crown" its opening post with the completed questionnaire from the header of the floor plan section. Then we will find the right approach for your house. A 180 sqm bungalow "fits" really well only for a childless couple of private means (and otherwise suggests other naive motives such as "saving the stairs," "everything on one level is more age-appropriate," or similar). Do you even already have – best answer in the new thread linked here – the specific plot of land?

Basically, I can follow your line of thought. However, without being able to back it up with numbers, I assume that it will not be cost-effective. If it gets cold in the fall, then you might be able to start heating about 2 weeks later (my assumption). However, you will have extra effort in the planning and construction phases due to the different construction methods. Additionally, you will probably need 2 different "contractors," both of whom would typically want to build an entire house themselves.

What led you to decide on a solid wood house? If you are convinced by the building material wood (ecological, etc.), then you should not introduce stone walls just because of a few € in heating costs.

In 2015, we were looking for a passive house builder. The addressed [Stein auf Stein] had declined, [Massivholz Keim] was not an option. Whether it is due to the material or the customer clientele, I do not know.
If solid wood cools down faster, it would be more difficult.
Actually, we were always told the opposite.
Solid wood would have longer cooling times than [Stein auf Stein].

[thoma Bau Österreich] has an overview of the cooling times. Are they correct?

I would decide on one building material; everything else causes problems. I would always choose solid wood again.

We had exactly this issue, but only in the area of the partition wall between the two semi-detached houses.

Here, however, the builder who constructed the solid wood house simply has practical objections. The solid wood house is prefabricated in elements measuring max. 9x3m. When the trucks arrive with the house, the shell is finished including the roof 3-4 days later. Building our partition wall would not be possible, as it would have to stand freely about 9m high. First building the ground floor walls, setting up the house, then waiting for the masons would also not be practical.

If your interior walls on the ground floor are load-bearing, you are facing exactly this problem.

A solid wood house cools down quickly only in winter with open windows and doors, if it is built with controlled residential ventilation. However, I have no proof for this thesis yet. I might be able to provide some in about a year.

If there is nonetheless a "small" difference between masonry or solid wood inside, I advise you: accept it.