ᐅ Different Wall Systems for Houses, Load-Bearing Capacity, and Strength
Created on: 13 Jul 2025 14:48
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Flo&SteffiF
Flo&Steffi13 Jul 2025 14:48Hello 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.
D
derdietmar13 Jul 2025 15:42Hello,
you want a house in Alpine chalet style. So why not build it that way? Stone solid on the ground floor and solid wood on the upper floor?
Best regards
you want a house in Alpine chalet style. So why not build it that way? Stone solid on the ground floor and solid wood on the upper floor?
Best regards
Hello,
The question about fastening in prefabricated houses with a traditional wall structure, which only includes drywall on both sides, is very valid. The key point is that a drywall partition with just gypsum board has structurally limited load-bearing capacity—regardless of what sales arguments might suggest. Without built-in wood-based panels behind the gypsum, the options are indeed very restricted, as drilling for cavity anchors usually perforates the vapor barrier. Technically, systems with additional OSB/plywood panels or gypsum fiberboard on the interior side clearly have the advantage: load capacity, flexibility, and protection of the airtight layer are more effectively addressed in practice.
The question about fastening in prefabricated houses with a traditional wall structure, which only includes drywall on both sides, is very valid. The key point is that a drywall partition with just gypsum board has structurally limited load-bearing capacity—regardless of what sales arguments might suggest. Without built-in wood-based panels behind the gypsum, the options are indeed very restricted, as drilling for cavity anchors usually perforates the vapor barrier. Technically, systems with additional OSB/plywood panels or gypsum fiberboard on the interior side clearly have the advantage: load capacity, flexibility, and protection of the airtight layer are more effectively addressed in practice.
A quick note upfront: if you’re looking for an Alpine chalet, none of the mentioned providers come to mind. I would rather think of a traditional Tyrolean timber house builder.
Regarding vapor retarders/barriers: the better builders use an installation layer. This layer is usually 60mm (2.4 inches) thick until you reach the actual airtight layer. Whether the front part consists of drywall plus OSB, hardboard, or Fermacell is simply a matter of price.
And now the subjective opinions begin: some swear by a diffusion-open wall construction, meaning without plastic foil (just to simplify), relying instead on OSB as a vapor retarder. Or also ESB, as mentioned, it’s a question of price. Then there’s the choice of insulation material. Some use mineral wool, others prefer natural insulation materials like wood fiber, hemp, or cellulose.
As plaster carrier boards, some use expanded polystyrene (EPS), others use wood fiber insulation boards, which are even available pre-plastered. Of course, there are quality differences here.
In the end, it’s a matter of both price and personal preference. I wouldn’t build today without an installation layer, nor would I use mineral wool. It creates a completely different indoor climate. But everyone has to make that decision for themselves.
And I’m sure someone will soon say, “Only build with solid construction...” (OK, that was a bit off-topic).
Regarding vapor retarders/barriers: the better builders use an installation layer. This layer is usually 60mm (2.4 inches) thick until you reach the actual airtight layer. Whether the front part consists of drywall plus OSB, hardboard, or Fermacell is simply a matter of price.
And now the subjective opinions begin: some swear by a diffusion-open wall construction, meaning without plastic foil (just to simplify), relying instead on OSB as a vapor retarder. Or also ESB, as mentioned, it’s a question of price. Then there’s the choice of insulation material. Some use mineral wool, others prefer natural insulation materials like wood fiber, hemp, or cellulose.
As plaster carrier boards, some use expanded polystyrene (EPS), others use wood fiber insulation boards, which are even available pre-plastered. Of course, there are quality differences here.
In the end, it’s a matter of both price and personal preference. I wouldn’t build today without an installation layer, nor would I use mineral wool. It creates a completely different indoor climate. But everyone has to make that decision for themselves.
And I’m sure someone will soon say, “Only build with solid construction...” (OK, that was a bit off-topic).
N
nordanney13 Jul 2025 16:27Flo&Steffi schrieb:
A house in Alpine chalet style, with 1.25m (4 feet) roof overhangs, plastered at the bottom, wood cladding at the top, small mullioned windows, etc., situated on a stunning hillside property with a view. When I read this, I immediately think: "This is definitely something for an architect." A typical prefab house builder, whose standard homes are designed for flat plots, would only come into the picture at step 157. It’s kind of like wanting to buy a Humvee and going to VW, Fiat, and Peugeot instead.
But that’s just a side note and not related to the specific question.
Flo&Steffi schrieb:
How exactly do you properly fasten things in such houses without having to specifically hit the stud? What exactly do you want to fasten? That’s the real question.
Usually, drywall is designed to carry about 40kg (88 lbs) per linear meter (with a 30cm (12 inch) allowance). Double-layer drywall can hold around 70kg (154 lbs).
In bathrooms, fixtures are mounted on suitable support elements. In kitchens, as mentioned, you can use OSB or similar boards.
In summary: for all typical applications, standard drywall is sufficient, as 99% of the time you won’t have loads that heavy. The heaviest loads are usually found in kitchens or possibly with solid wood cabinets that are wall-mounted. Usually, this is known in advance.
Flo&Steffi schrieb:
How do you properly fix something in these types of houses without having to specifically hit the stud or framework?You can, for example, have an upgrade installed on certain walls by adding an extra layer of drywall, which usually comes at an additional cost. This is commonly done in kitchen areas and also standard in bathrooms where tiling is planned, by installing a second drywall layer according to DIN standards.
Our solid construction house has interior walls upstairs made with drywall. On site, you discuss with the drywall contractor which walls you want reinforced, for example, to support hanging shelves. In other places, it doesn’t make sense.
For a prefab house, you should consider in advance whether you need reinforced walls. It comes with an additional cost, but this is basically the philosophy with production builders and standard house models: the basic offer is affordable, and any extras are ordered on top for an extra charge.
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