5.5 hours of conversation. Diffusion open or closed?

If you have concerns regarding the wall construction, why don't you build monolithically? Have you ever obtained offers of this kind?

I can only report the following from my own experience: Hanse Haus is also located here in the model home park and they did not make the best impression back then, three years ago.

The most important things about the LLWP have already been written here.

Is KFW55 worthwhile by now..... how big is the financial difference between 70 and 55?

We have, from inside to outside:

12 mm gypsum board
12 mm OSB
60 mm installation layer with wood fiber insulation
12 mm OSB
200 mm stud frame with wood fiber insulation
35 mm Pavatex wood fiber board

The partition walls (OSB/gypsum boards) are not mentioned for you, otherwise it is similar.

What kind of board comes on the outside?

Now a vapor retarder (not a vapor barrier, those are two different things) is necessary if you don’t want your wall to eventually rot away (however, you can also build without it, but then there is no error tolerance at all and you really don’t believe that everything will be flawless during construction.)

Keitel-Haus says that their wall construction is designed so that it can diffuse well, meaning that moisture is transported away.

In the end, we didn’t build with Keitel-Haus because it was more expensive than the builder with monolithic brick wall construction. So it will be a solid house for us. But I still like Keitel-Haus

May I ask where the price difference lies?

The savings would be enormous – with €450 annual heating costs and a €9000 surcharge – they are good

Can you briefly explain to me? What would the heating costs be for KFW55?

Hello,
That is not correct; it is true that a singed wood surface (not veneers, but for example roof battens) slows down the combustion process.

The longest resistance time is concrete, if it is not reinforced with steel. But who wants to live in a concrete bunker?

Certainly not seconds, but if there is a fire, it is advisable to escape the fumes.

Rhenish regards

Hi, yes wood has low thermal conductivity and forms a kind of protective shield (charcoal layer) when burning, which in turn slows down further burning.

Furthermore, wood is predictable, it gives warnings before it breaks.

Of course, concrete, but nobody wants that

Seconds is exaggerated, but only very few minutes during which the polystyrene can set the whole house on fire.

Running and dripping fires add to that. With open windows above the fire site, it quickly ignites these rooms.

Polystyrene is one of the most dangerous if it ever catches fire. Plus all the toxic substances and smoke released. Not recommended.
Just have a look at polystyrene facade fires. Not a nice thing.

That’s why I don’t want polystyrene on the exterior wall!

Moin Moin

That's not the entire wall construction!?!

With provider A you then have the mineral wool visible and with provider B, due to lack of installation level, all wall installations are cut through the foil?

Olli

Of course not That’s also why it said wall construction among other things.

The exact outer wall construction from outside to inside:

Keitel-Haus:

# High-quality, diffusion-open silicone resin fine plaster, colored throughout

# Base plaster made of reinforcing compound and full-surface mesh fabric

# 60mm wood fiber insulation board

# 200mm timber frame construction with

# 200mm mineral fiber insulation (nowadays StoThermWood wood fiber insulation)

# 12mm OSB board

# 12.5mm gypsum board


Hanse Haus:

# 2mm colored synthetic resin plaster in scratch structure look

# 3mm reinforcing plaster with fiberglass mesh

# 150mm thermal insulation, WLG 032

# 8mm OSB board

# 125mm timber frame construction with mineral insulation in between

# 8mm OSB board and diffusion-open vapor retarder fleece

# 12.5mm gypsum board

Here every 31cm there is a wooden stud with integrated electrical empty conduit, but to get there, I think you have to cut through the foil.

With Keitel-Haus, I can have as many empty conduits installed as I want and wherever I want without extra charge.

If you have concerns about the wall construction, why don’t you build monolithic?

Have you already obtained offers in that regard?

Whether KFW55 is worthwhile by now… how big is the financial difference between 70 and 55?

Not really concerned, just wanted to know who is right about diffusion openness and retarder fleece and such.

Monolithic means solid construction, right?

No offers yet, I wanted to call 2-3 local builders today and make appointments to ask what it would cost.

The financial difference between 70 & 55? Good question, but we want to be independent of electricity and gas anyway, so heat pump and photovoltaic system as well. That already achieves KFW55 if the masonry and so on fits.



Another question, we could save €6100 if we insulate and sheath the interior walls and ceilings ourselves.

Is that recommended? Easily doable? Or does everything have to fit perfectly and also windows cut out etc.?

We would get the materials provided, except for tools

# 12mm OSB board

# 12.5mm gypsum plasterboard

As already said: I would claim that there is a vapor barrier in between here as well!

By shopping with your own expertise, I do not mean books etc., but an expert. That is exactly perfect for people who have not even remotely learned something in that direction.

Another question, we could save €6100 if we insulate and board the interior walls and ceilings ourselves.

If you have plenty of time and want a real muscle ache, yes . We had the same issue with us, could have saved around €5000, the material would have been delivered. But the €5000 was really worth it to me. However, it should be noted that we have 15mm Fermacell boards. In the large format, one person alone cannot lift them. Conclusion: You need at least two people working on it, and even then it's backbreaking work. Anyone who has never done this before should stay away from it unless they have a lot of time and help.