DanSai81
2025-10-24 08:22:55
- #1
Hello everyone.
I have already asked this question in another forum. However, I was then advised to try it here.
In our house (built in 1975), an existing bathroom in the basement is to be renovated. The bathroom consists of a shower, toilet, and washbasin. The shower and the toilet are on the exterior wall.
I have now removed all tiles and fixtures for the time being. In doing so, I noticed that the exterior wall is damp in the lower 50 cm. My cheap measuring device for firewood showed a value of just over 30%. On the other walls, the device showed nothing at all.
The original plan was to sand off the tile adhesive so that the walls could be tiled again later. But now I am concerned about the damp wall. Here, the tile adhesive has come off very well compared to the other walls.
Is my plan sufficient to prepare the wall in such a way that I can apply liquid waterproofing to the wall and floor in the shower area and then tile? Or do I need to work with cement boards? I have already read different information on the internet. Also, that I should stick the cement boards directly to the wall, but the datasheets of the respective boards all state that a substructure (UK) is necessary.
The previous tiles lasted 40 years, the bathroom was only in use for a few years and unheated. The new bathroom will have heating but will be used regularly.
We already had an expert in the house regarding the basement walls. He said at that time that it was harmless and only an external sealing could remedy it. We are supposed to simply heat and ventilate the rooms. Two laundry rooms are located in the two adjacent rooms.
It would be great if I could get concrete tips and information. The bathroom is currently being prepared for a caregiver who looks after my parents-in-law in the house.
Many thanks and best regards Daniel
PS: There are no efflorescences, the rooms do not smell musty, and the previous wall covering holds.
I have already asked this question in another forum. However, I was then advised to try it here.
In our house (built in 1975), an existing bathroom in the basement is to be renovated. The bathroom consists of a shower, toilet, and washbasin. The shower and the toilet are on the exterior wall.
I have now removed all tiles and fixtures for the time being. In doing so, I noticed that the exterior wall is damp in the lower 50 cm. My cheap measuring device for firewood showed a value of just over 30%. On the other walls, the device showed nothing at all.
The original plan was to sand off the tile adhesive so that the walls could be tiled again later. But now I am concerned about the damp wall. Here, the tile adhesive has come off very well compared to the other walls.
Is my plan sufficient to prepare the wall in such a way that I can apply liquid waterproofing to the wall and floor in the shower area and then tile? Or do I need to work with cement boards? I have already read different information on the internet. Also, that I should stick the cement boards directly to the wall, but the datasheets of the respective boards all state that a substructure (UK) is necessary.
The previous tiles lasted 40 years, the bathroom was only in use for a few years and unheated. The new bathroom will have heating but will be used regularly.
We already had an expert in the house regarding the basement walls. He said at that time that it was harmless and only an external sealing could remedy it. We are supposed to simply heat and ventilate the rooms. Two laundry rooms are located in the two adjacent rooms.
It would be great if I could get concrete tips and information. The bathroom is currently being prepared for a caregiver who looks after my parents-in-law in the house.
Many thanks and best regards Daniel
PS: There are no efflorescences, the rooms do not smell musty, and the previous wall covering holds.