ᐅ Different Wall Systems for Houses, Load-Bearing Capacity, and Strength
Created on: 13 Jul 2025 14:48
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Flo&Steffi
Hello dear forum,
Our names are Florian and Stefanie, both in our mid-40s. We have already built two houses in our lives, both using solid construction methods. Now we are about to build our third house, which we will move into and sell the other two. Our dream (which we couldn’t realize before due to building plan restrictions/planning permission constraints) is to have an alpine chalet-style house, with 1.25m (4 feet) roof overhangs, plastered on the lower part, wood cladding on the upper part, small muntin windows, and so on, situated on a beautiful hillside plot with a view.
We are now looking into the different construction methods for timber frame houses. I have thoroughly researched various manufacturers and their wall assembly methods. However, I couldn’t really find much on their practical performance after construction. Since the suppliers all claim to have the best wall system in the universe, and one can’t necessarily rely 100% on their statements, I’d like to raise a question regarding prefabricated construction.
Some providers, such as Schwabenhaus, still use wall assemblies today that have only 12mm (0.5 inch) gypsum plasterboard on both the outside and inside. As a fairly experienced craftsman, I want to ask: how do you properly fix things to the walls in such houses without having to specifically hit the timber framing behind?
It is clear that gypsum board has some load-bearing capacity, especially with drywall anchors. But when I use those, I always puncture the vapor barrier that lies immediately behind the plasterboard in all such systems from every provider. Isn’t that a huge downside, or am I missing something here?
For example, Bien-Zenker takes a different approach. They use Knauf hardboard on the inside, which I know from my own experience. It’s like concrete for fixing purposes; I would even categorize its load-bearing capacity as better than brick. Schwörerhaus (and others) also install a wood-based panel behind the drywall on the inside, which is also highly load-bearing. The total thickness is usually around 12.5 + 18mm (0.5 + 0.7 inches), so about 30mm (1.2 inches), which allows you to fix things securely with 5-6 x 30mm (2 x 1.2 inch) wood screws. With the precise use of these screws, I can fix wherever I want without ever hitting the vapor barrier. Schwörerhaus even has, unlike all others, a composite board with very high load capacity under the plaster base on the exterior.
How is this handled, for example, by Schwabenhaus? From a purely technical perspective, should this provider be ruled out because of this one issue, or am I mistaken as I said earlier?
Best regards to everyone.
Our names are Florian and Stefanie, both in our mid-40s. We have already built two houses in our lives, both using solid construction methods. Now we are about to build our third house, which we will move into and sell the other two. Our dream (which we couldn’t realize before due to building plan restrictions/planning permission constraints) is to have an alpine chalet-style house, with 1.25m (4 feet) roof overhangs, plastered on the lower part, wood cladding on the upper part, small muntin windows, and so on, situated on a beautiful hillside plot with a view.
We are now looking into the different construction methods for timber frame houses. I have thoroughly researched various manufacturers and their wall assembly methods. However, I couldn’t really find much on their practical performance after construction. Since the suppliers all claim to have the best wall system in the universe, and one can’t necessarily rely 100% on their statements, I’d like to raise a question regarding prefabricated construction.
Some providers, such as Schwabenhaus, still use wall assemblies today that have only 12mm (0.5 inch) gypsum plasterboard on both the outside and inside. As a fairly experienced craftsman, I want to ask: how do you properly fix things to the walls in such houses without having to specifically hit the timber framing behind?
It is clear that gypsum board has some load-bearing capacity, especially with drywall anchors. But when I use those, I always puncture the vapor barrier that lies immediately behind the plasterboard in all such systems from every provider. Isn’t that a huge downside, or am I missing something here?
For example, Bien-Zenker takes a different approach. They use Knauf hardboard on the inside, which I know from my own experience. It’s like concrete for fixing purposes; I would even categorize its load-bearing capacity as better than brick. Schwörerhaus (and others) also install a wood-based panel behind the drywall on the inside, which is also highly load-bearing. The total thickness is usually around 12.5 + 18mm (0.5 + 0.7 inches), so about 30mm (1.2 inches), which allows you to fix things securely with 5-6 x 30mm (2 x 1.2 inch) wood screws. With the precise use of these screws, I can fix wherever I want without ever hitting the vapor barrier. Schwörerhaus even has, unlike all others, a composite board with very high load capacity under the plaster base on the exterior.
How is this handled, for example, by Schwabenhaus? From a purely technical perspective, should this provider be ruled out because of this one issue, or am I mistaken as I said earlier?
Best regards to everyone.
Hello,
a practical wall construction from outside to inside is: ventilated facade – insulation layer (I prefer wood wool because of its thermal benefits and good sound insulation) – GFM panel (non-glued wooden battens arranged diagonally, about 35mm (1.4 inches) thick; this can even be used directly as an interior wall if you like wooden walls. It can also be covered with clay plaster to achieve white interior walls).
In the lower part of the house, you can apply clay plaster on a plaster carrier board. The rest of the wall construction would remain the same. Walls in contact with the ground are naturally different.
This is one of the best wall constructions from a building biology perspective. It is easy to achieve high insulation values.
Otherwise, you have the choice of a solid wood facade or something new like "triqbriq." That is a very nice idea.
I am a bit surprised that you exclude a heat pump, as it is the most cost-effective way to heat. If you want low costs, an air conditioner is unbeatable, and with photovoltaics, you can cool for free in summer.
a practical wall construction from outside to inside is: ventilated facade – insulation layer (I prefer wood wool because of its thermal benefits and good sound insulation) – GFM panel (non-glued wooden battens arranged diagonally, about 35mm (1.4 inches) thick; this can even be used directly as an interior wall if you like wooden walls. It can also be covered with clay plaster to achieve white interior walls).
In the lower part of the house, you can apply clay plaster on a plaster carrier board. The rest of the wall construction would remain the same. Walls in contact with the ground are naturally different.
This is one of the best wall constructions from a building biology perspective. It is easy to achieve high insulation values.
Otherwise, you have the choice of a solid wood facade or something new like "triqbriq." That is a very nice idea.
I am a bit surprised that you exclude a heat pump, as it is the most cost-effective way to heat. If you want low costs, an air conditioner is unbeatable, and with photovoltaics, you can cool for free in summer.
I would not recommend building in the Alpine style just for the sake of architectural authenticity: regional building styles have their reasons, including climatic ones, and without the corresponding high-altitude sun, large roof overhangs can quickly become a nuisance. Using plaster on the lower part and wood cladding above does not seem like a meaningful reason for a mixed construction method, although a sloped site would be a good reason to suggest a stone construction (which does not prevent achieving a wood-like appearance). Eliminating a builder simply because their standard offering includes only single-layer sheathing seems unnecessary to me. This should be specified in the detailed planning phase, for example by using different sheathing for the kitchen walls. The crucial factor for the wall’s load-bearing capacity is the second-to-top wall layer. Here, an engineered wood product offers more benefits than an additional or thicker gypsum board. I would always hire an independent architect for a sloped site. General contractors with planning authorization technically provide the "necessary" architectural services. Being charged separately for additional services by budget architects does not change that.
That is actually relevant and should be a key criterion when selecting any turnkey home builder, especially if the desired finishing standard is a "weather-tight shell."
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Flo&Steffi schrieb:
I'm not interested in heating, flooring, tiles, or anything else because I will handle all that myself.
That is actually relevant and should be a key criterion when selecting any turnkey home builder, especially if the desired finishing standard is a "weather-tight shell."
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
F
Flo&Steffi13 Jul 2025 22:29alles3d schrieb:
Hello,
a sensible wall construction from outside to inside is: curtain facade – insulation layer (I prefer wood wool because of the thermal benefits and good sound insulation) – GFM panel (non-glued wooden battens arranged diagonally, about 35mm (1.4 inches) thick; this can even be used directly as an interior wall if you like wooden walls. It can also be covered with clay plaster to create white interior walls).
In the lower part of the house, clay plaster can be applied on a plaster carrier board. The rest of the wall build-up would be the same. The walls in contact with the ground are of course different.
This is one of the best wall constructions from a building biology perspective. It allows for easily achieving high insulation values.
Otherwise, the choice remains between a solid wood facade or something new like "triqbriq." That is a very nice idea.
I am a bit surprised that you exclude a heat pump, since that is the most cost-effective way to heat. If costs should be low, an air conditioner is unbeatable, and with photovoltaics, you can cool in summer for free. Hey.
I include the purchase costs for heat pumps, and unfortunately, the picture looks very different there. So far, no one has been able to show me a positive calculation. We do not have or plan to install photovoltaics for the same reason. I prepare everything upfront, but what will happen in 10 years is uncertain.
We will get a Ratiotherm Oskar 08 with fresh water station and PT, including a condensing boiler for a little over 10,000€. The rest of the exterior work on the house is done by Primagas on an annual rental basis, and it will be filled 100% with Futuria. It can’t get cheaper and fully complies with the building energy regulations (building permit / planning permission). Possibly even, currently and unfortunately for the medium term, with less CO2 impact than our current electricity mix. And when it is cold, all heat pumps use conventional heating anyway, as photovoltaics do not provide much power then, as we all know.
Cooling in summer with photovoltaics is great; we debated this extensively, but currently, I prefer the tried and tested method if the goal of CO2 reduction is still met. Because that is the real purpose of the building energy regulations, not simply installing a heat pump. In my view, many people interpret this too narrowly. The situation is more complex than many realize. Futuria will not have a CO2 price by 2027 either and chemically has the properties of propane, so it is identical 1:1. It costs nothing in comparison, and what I install in 10 or 15 years remains open.
We switched our current system to Futuria a year and a half ago. It costs only 15% more and works brilliantly.
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Flo&Steffi13 Jul 2025 22:3411ant schrieb:
I wouldn’t recommend choosing Alpine style just to make the house stand out architecturally: regional building styles have their reasons, including climatic ones. Without the associated high-altitude sun, those wide roof overhangs can quickly become a nuisance. Using plaster on the lower part and wood cladding on the upper part is not a strong reason for a mixed construction method, but a sloped site does justify recommending a solid masonry construction (which doesn’t complicate creating a wooden appearance). Excluding a builder just because their standard is single-layer drywall seems pointless to me. That detail should be addressed during the final planning phase—for example, using different wall coverings in the kitchen. The critical factor for the wall’s load-bearing capacity is the second-to-last wall layer. Here, an engineered wood product is more effective than an additional or thicker gypsum drywall panel. On a hillside location, I would always hire an independent architect. The general contractor’s architect, authorized only for template planning, literally provides the "necessary" architectural services. Getting their services separately itemized in the price range of discount architects doesn’t change that.
This, however, becomes relevant and should guide the selection among all turnkey providers if the finish standard of a "weatherproof shell" is the goal.Now it gets interesting… perhaps you can explain more about the points regarding the “high-altitude sun” and roof overhangs, along with hillside location and solid masonry construction. Is it mainly about protecting against heavy rainfall? I am very interested because I haven’t received any pushback from builders about timber frame houses on slopes, so this is a very intriguing aspect.
For context: the site is far in southern Bavaria, right where these conditions start to apply. On windy days like when there’s a föhn effect, we can already see the mountains slightly from the new plot.
A short info: the house will have a basement, so no slab foundation, and we are located at the highest point on the slope, basically the peak.
Papierturm14 Jul 2025 06:25Flo&Steffi schrieb:
Hi, thanks for the reply.
I would say I have a fair amount of experience in housebuilding, as this is actually the third one in my life, in case you didn’t catch that 🙂 At the same time, it’s my first in the prefab housing sector. Many very different providers have been lumped together, and the typical marketing language of the salespeople was repeated so faithfully that I almost believe some of it was word-for-word quoting.
All providers can build houses. The key question is whether they can build one that fits your own ideas and requirements without any problems.
The emphasis is on “without problems.”
Example: Timber cladding –
There are providers who do this as a standard option and have a lot of experience with it.
On the other hand, there are many providers who say “sure, we can do that,” but actually do it only rarely or never as a standard.
For the planned house, which provider should you choose to build with?
Similarly, with a provider who normally installs drywall, you can pay extra for better wall panels. But this usually leads to higher costs than providers who supply better panels as standard and whose staff (or subcontractors) are more experienced and trained in the different construction methods.
Also, I’m not interested in heating But you should be.
Some providers include radiant floor heating at reasonable prices. Others charge exorbitant prices for radiant heat systems.
No matter what kind of heating technology you install today, to future-proof your house you should consider radiant floor heating.
Unless you’re planning to do it yourself, including pouring the screed.
And if you really only want the building shell, then going to a local carpenter’s workshop almost always costs less than the big providers.
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Flo&Steffi14 Jul 2025 09:21Papierturm schrieb:
At the same time, this is the first in the prefabricated house segment. Various, sometimes very different providers were grouped together, and the typical marketing language of the sellers was reproduced so accurately that I almost believe they are literal quotes.
All providers can build houses. The key question is whether they can build one that fits the customer’s own ideas and requirements without any problems.
The emphasis is on "without any problems."
Example: Wood cladding:
There are providers who do this as a standard and have a lot of experience with it.
On the other hand, there are many providers who say "sure, we can do that," but this is not their standard practice and they do it rarely or never.
Which provider should you use for the planned house?
Similarly, you can pay extra for better wall sheathing from a provider who normally uses just a simple drywall sheet. This usually leads to higher costs than with providers who offer better sheathing as standard and whose employees (or their subcontractors) are more experienced and trained in that kind of construction.
But it should be that way.
There are providers who include radiant floor heating at reasonable prices. Others charge exorbitant amounts for it.
No matter what heating technology you install today, to really future-proof your house, you should consider radiant floor heating.
Unless you do the work yourself, including pouring the screed.
And if you only want the building shell, it’s usually cheaper to go to a local carpenter. That almost always costs less than the big providers. Good morning.
I didn’t ask about any of this, but that’s just how forums are, so I’ll leave it as it is. I have no idea where I supposedly used marketing phrases or what anyone is interpreting there. I don’t care, I don’t need marketing, and I’m not going to debate heating systems anymore—I’ve been through that for years and take care of that myself. I received a tip that is very helpful; that’s all I need right now as I have enough on my plate with planning. The offers I got don’t include heating because I’m sourcing that myself, as planned from the beginning. There is NO heating except the underfloor pipes, which are already installed in all cases. And yes, I have discussed that with all providers individually. So please, no one tries to claim that some providers do not include underfloor heating.
Best regards
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