Hello,
we are currently exploring our basic construction method. We have two regional suppliers who differ significantly, especially regarding the exterior wall structure:
Wall construction A: Fermacell / wood fiberboard (installation layer) / OSB / cellulose / soft wood fiber insulation board / plaster (total wall thickness for KfW55 standard 37cm (15 inches))
Wall construction B: Fermacell / cellulose / wood fiber insulation board / plaster (total wall thickness for KfW55 standard 31cm (12 inches))
Both manufacturers produce their walls in a closed facility, including windows and interior components. I believe that if the construction is done properly, the installation layer can be omitted. This also creates additional living space.
For us, the question remains whether wall construction B has any disadvantages compared to wall A. In house A, the OSB board acts as a vapor barrier. In house B, there is no classic vapor barrier.
Does this give me an advantage, a disadvantage, or perhaps both? Does anyone reading this possibly live in a house with wall construction B?
I hope you can help shed some light on this topic 🙂
With that said, thank you and Merry Christmas
donny
we are currently exploring our basic construction method. We have two regional suppliers who differ significantly, especially regarding the exterior wall structure:
Wall construction A: Fermacell / wood fiberboard (installation layer) / OSB / cellulose / soft wood fiber insulation board / plaster (total wall thickness for KfW55 standard 37cm (15 inches))
Wall construction B: Fermacell / cellulose / wood fiber insulation board / plaster (total wall thickness for KfW55 standard 31cm (12 inches))
Both manufacturers produce their walls in a closed facility, including windows and interior components. I believe that if the construction is done properly, the installation layer can be omitted. This also creates additional living space.
For us, the question remains whether wall construction B has any disadvantages compared to wall A. In house A, the OSB board acts as a vapor barrier. In house B, there is no classic vapor barrier.
Does this give me an advantage, a disadvantage, or perhaps both? Does anyone reading this possibly live in a house with wall construction B?
I hope you can help shed some light on this topic 🙂
With that said, thank you and Merry Christmas
donny
We live in a house with wall construction type A. For us, this was the only logical and suitable solution regarding airtightness and the associated installation cavity.
The exterior wall consists of a double-layer plaster with two coats applied over mesh, followed by a skim coat that is pre-applied in the factory. Then, a wood fiber insulation board, OSB board, 180/200 mm (7/8 inches) wood studs filled with cellulose insulation, another OSB board, an installation cavity, and finally a Farmacell board.
The exterior wall consists of a double-layer plaster with two coats applied over mesh, followed by a skim coat that is pre-applied in the factory. Then, a wood fiber insulation board, OSB board, 180/200 mm (7/8 inches) wood studs filled with cellulose insulation, another OSB board, an installation cavity, and finally a Farmacell board.
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