ᐅ How to seal a hairline crack in a 30 cm thick waterproof concrete structure ("white tank")?
Created on: 22 Mar 2018 17:31
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Gerd53The basement is over 25 years old and in very good condition.
There is a hairline crack, a dark stain, and a yellow stain on one wall, as shown in the photo. I dabbed the area with kitchen paper, and no moisture was detected on the paper.
The waterproof concrete structure (white tank) is about 30 cm (12 inches) thick.
For scale: The tile visible in the photo is 33 cm (13 inches).
Should the hairline crack be repaired?
What could be the cause of the black stain?
There is a hairline crack, a dark stain, and a yellow stain on one wall, as shown in the photo. I dabbed the area with kitchen paper, and no moisture was detected on the paper.
The waterproof concrete structure (white tank) is about 30 cm (12 inches) thick.
For scale: The tile visible in the photo is 33 cm (13 inches).
Should the hairline crack be repaired?
What could be the cause of the black stain?
T
Trasher1923 Mar 2018 09:55I would definitely have a professional waterproofing company take a look at this. The yellow areas are likely salt deposits, which definitely indicate a leak that has been present for some time. At first glance, the black area even looks like mold or mildew.