Several years after drainage around the house, the paint on the inside of the basement wall is starting to bubble and fall off. Crystals are growing from the porous cement. What could be the cause of this? The house is from 1950. It wasn't particularly damp in the basement before the drainage, and the wall paint was applied before the drainage.
You clearly have moisture in the wall in the picture. Is the drainage working as intended, or could there be a blockage somewhere in the runoff? What possibilities do you have to check outside (inspection well, etc)?
You clearly have moisture in the wall in the picture. Is the drainage working as intended, or could there be a blockage somewhere in the drainage? What possibilities do you have to check outside (inspection hatch, etc)?
RRödskägg said:
Several years after drainage around the house, the paint on the inside of the basement wall starts to bubble and fall off. Crystals are growing from the porous cement. What could this be due to? The house is from 1950. It wasn't particularly damp in the basement before the drainage, and the wall paint was applied before the drainage. [image] [image] [image] [image]
DDublin said:
You clearly have moisture in the wall in the picture. Is the drainage working as intended, or could there be a blockage somewhere in the drainage? What possibilities do you have to check outside (inspection hatch, etc)?
The company that performed the drainage ground away asphalt from the outside, and isodrän panels are installed. The drainage pipe was placed lower than the foundation and a sump pump was necessary. I've checked that the pump is working, and there's nothing abnormally high in the sump. I find it strange that the crystals and bubbles are appearing about 1dm up the wall. The picture with the pipes is at 1m height. Can water from outside really reach the wall through the isodrän? I've seen the manufacturer demonstrate how good isodrän is, and in those demos, the water drains away in the structure before it reaches the wall. It's also odd that there would be more moisture in the wall after the drainage.
increase the heat, moisture will migrate in if you insulate a cold basement
Yes, it might be something like that... but in that room, I've installed a heater compared to before. So it's probably the warmest room in the basement. That room also has relatively good ventilation. An out-vent in the chimney and in from two adjacent rooms with in-vents (no door between). I'm now wondering if it's moisture in the basement's "warm" air that condenses on certain colder areas on the inside of the wall. That's the room where the washing machine is, but I hang the laundry to dry outside. It's only on the outer wall of that room that the blemishes have appeared. Not in the other rooms. Yet?
I haven't measured with instruments, but when you break a bubble, there are crystals and cement powder in it. It feels very dry. It's easy to scrape out more cement. As if the cement has lost its strength and becomes powder together with the crystals.
More pictures.
No, I've had geothermal heating in the house for 40 years. But in the room with the washing machine, I've had a standalone electric heater for two years. It's been a laundry room for at least 20 years. The drainage was done in March 2017. I noticed the stains and crystals a year or two ago as very small discolorations. Now there are quite large areas.
This is what optidrain says in their installation instructions
[link][image]
That section "cement that has been moist and dries up causes lime deposits" seems to be the answer to the phenomenon that has now occurred in the basement. And the drying of the wall actually didn't start when the drainage was completed in 2017 but has been delayed until now when I installed a radiator and raised the temperature in that room. Not to 18-20 degrees though, but over 15 degrees at least.
Good info! Thanks!
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Huddingebo said:
