ᐅ Looking for a construction company in the Greater Stuttgart area!

Hauser: because it is simpler, faster, and more cost-effective for the installers to run the pipes on a separate level below the ceiling. Additionally, expanded polystyrene (EPS) is significantly cheaper than concrete, which explains the EPS-concrete composite slab. It also eliminates the need for additional thermal insulation under the screed or makes it easier to install. That is why Hauser does not use solid monolithic walls either, as it is more economical.

Pushing cables into a hollow-core slab is much less convenient and far more complicated. If mistakes are made, it is difficult to access them again.

Köhler probably uses the same approach as any typical traditional solid construction company here in the southwest. The ceiling is the ceiling, and the installation level is located below the screed.

Question for @erazorlll: How is the basement planned? Will it be heated fully or partially? What is the design of the floor slab? Traditional with a screed on top including insulation, or insulation beneath the floor slab? A Swedish floor slab with integrated heating loops? I would pay attention to that as well.

cyberfabi schrieb:

Moreover, expanded polystyrene is significantly cheaper than concrete. That’s why houses don’t have solid monolithic walls. Installing cables in a hollow-core slab is much less enjoyable and much more complicated.

Do the people at Hauser really find their system so irresistibly perfect that everything has to be made from it? You can use ETICS (External Thermal Insulation Composite System) or insulated formwork blocks for walls and combine them with the same “filigree slab” that the neighboring porous brick builder uses (?).
I’m always skeptical of “one solution fits all.”

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cyberfabi schrieb:

Question for @erazorlll: How is the basement planned? Partially or fully heated? What is the design of the slab on grade? Traditional with screed and insulation on top, or insulation beneath the slab? Swedish slab with integrated heating loops? I would pay attention to that as well.

The plot is on a slope with the entrance/street at the lower ground level. This means the basement is open to the front and embedded into the slope at the back. The front rooms (hallway and workspace) are planned to be heated with underfloor heating, while the rear rooms (storage and technical room) will not be heated.

The builder specifies the slab: “25cm (10 inches) thick slab on grade made of watertight concrete according to DIN 1045 [...] Under and around the slab edge, 80mm (3 inches) of insulation with thermal conductivity class 035 made of load-bearing polystyrene. Beneath that, an 8cm (3 inches) layer of crushed stone with a PE membrane on top.”
And regarding the screed: “On the slab in the building services area, a polymer-bitumen membrane with aluminum reinforcement, followed by insulation consisting of two layers of 40mm (1.5 inches) rigid foam and 40mm (1.5 inches) calcium sulfate screed. In the stairwell, 40mm (1.5 inches) rigid foam, underfloor heating stapler plates 20mm (0.8 inches), and 60mm (2.4 inches) calcium sulfate screed.”

I cannot provide details for Köhler at the moment.

erazorlll schrieb:

Köhler (and similar U-Haus)
Exterior: Ytong aerated concrete ThermStandard PP2-0.35 with 0.09 lambda value
Interior: Silka calcium silicate brick
Foundation slab: 22cm (9 inches)
Clear structural height: 2.65m (8.7 ft) – finished ceiling height approx. 2.50m (8.2 ft)

Unfortunately, I don’t have any documents from Köhler yet, so this is just from memory and my notes, but I think I made a mistake in the description above. If I recall correctly, there is a distinction between load-bearing and non-load-bearing walls.

I believe the correct setup is:
Exterior: Ytong aerated concrete ThermStandard PP2-0.35 with 0.09 lambda value
Interior load-bearing: Silka calcium silicate brick
Interior non-load-bearing: 10cm (4 inches) gypsum wall panels

Could that be right?
I would need to verify this again.

11ant schrieb:

Do the people at Hauser really find their system so incredibly irresistible that everything has to be made from it?

Ooooooooh yes, they certainly do