KlaRa
2021-10-14 14:28:43
- #1
No, he means that a bathroom is planned in the attic at the spot where the bathroom is already located on the floor below.
The question is, is parquet flooring planned there (in the attic) despite the bathroom?
On the other hand: Since a waterproofing layer will be required in the bathroom anyway, can he probably skip an additional vapor barrier?
According to the additional notes, there is another (already existing) bathroom below the planned bathroom.
Here, the ceiling construction should be equipped with a vapor barrier so that high humidity cannot "escape upwards."
Otherwise, it is correct that the screed in the new bathroom (in the attic) as well as the wall surfaces should definitely be waterproofed. Regardless of which water exposure class applies (W0-I or W1-I). Purely for safety reasons.
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"OK, so a vapor barrier must be installed over the dried screed, then the impact sound insulation, and finally the floorboards."
Basically: YES.
But if the screed surface is not sufficiently level (see DIN 18202 Table 3, Row 3), then the floorboards can later "wobble" when walked on.
So determine the levelness before installation and if necessary (this would be my recommendation) level the surface with filler over the entire area.
Then place the vapor barrier on this and the "crunch protection" (commonly but mistakenly called impact sound insulation. It is rather a structure-borne sound insulation!).