Moisture after drainage

[Roffos]

Anyone know what is normal regarding moisture in the basement wall after drainage? I think I’ve read all the threads here but am not getting wiser.

The house was drained about 7 months ago. Asphalt layer ground away and then isodrän by a reputable company. The ground is judged to be dry.

Now, old paint is peeling in a limited area of the basement wall. I feel that it feels moist under the paint flakes and noticeable salt/lime efflorescence appears.

The basement now maintains a humidity level of 47% with a dehumidifier, and the temperature is fairly constant at 15’c.

So why do you think moisture/salt stains are suddenly appearing now? Someone mentioned it's a sign that the wall is drying out? Humid summer? New moisture paths in newly dug ground? Wrong paint?

I think that it is at least moisture that has come after drainage?

 

[Roffos]

Picture of the basement wall. Scraped off bubbling paint.

 

[useless]

Is it only in one place?

 

[Roffos]

Is it only in one place?

Yes, I can only see it in this area.
The basement only has painted concrete walls of hollow concrete.

 

[umisaam]

Hello, did you get any clarity on what caused this? I have exactly the same problem and would be very grateful for an answer.

 

[jonaserik]

Hi, did you get any clarity on what caused this? I have exactly the same problem and would be very grateful for an answer.

Have you also drained and experienced this issue, is it just isodrän against the foundation or something dense outside (platon)? How do the downspouts go, straight out on the ground or into pipes away from the house? If the latter, are the drain/stormwater to the same well or not?

 

[Roffos]

Hi, did you get any clarity on what caused this? I have the exact same problem and would be very grateful for an answer.

Hi, I spoke with a construction advisor through my anticimex insurance. From what I understand, the conditions have changed. Previously it was painted with asphalt on the outside which was completely sealed and worked well. The drainage company removed the asphalt according to the instructions for the isodrän board. I understand it is done so the wall can breathe and moisture can spread more widely, instead of being concentrated. High moisture in the ground should be broken by the isodrän board but will still cause moisture against the wall. An old asphalt layer can create problems if there are cracks in the basement wall or damage to the asphalt layer. Then moisture can become high at specific damage points. I painted in the spots where the paint had come off. I used a layer of silicate paint that breathes well and is unaffected by moisture. In places where the paint comes off, it has been painted many layers over the years since 1965, so it is probably completely sealed.

So… my conclusion is, that in my case, this is a "normal" consequence of changing the strategy from "rubber boot" to "goretex". If the situation worsens on my wall, I will sand it down and repaint with a new layer of silicate paint.

It states on the silicate paint that the diffusion openness is valid for up to two layers of paint.

Hope my answer makes some sense.

Good luck.

 

[Plupp 405730]

Hello, I spoke with a construction advisor through my anticimex insurance. From what I understand, the conditions have changed. Previously, it was painted with asphalt on the outside that was completely sealed and worked well. The drainage company sanded off the asphalt according to the instructions for the isodrän board. I understand this is done so the wall can breathe and the moisture can spread out more evenly, instead of being concentrated. High humidity in the ground should be broken through the isodrän board but will continue to affect the wall with moisture. An old asphalt layer can create problems if cracks develop in the basement wall or if there are damages to the asphalt layer. Then the moisture can become highly concentrated at the points of damage. I have painted over the spots where the paint has peeled off. I painted a layer with silicate paint that breathes well and is unaffected by moisture. In places where the paint peels off, there are many layers painted over the years since 1965, so it is probably completely sealed.

So... my conclusion is that, in my case, this is a "normal" consequence of changing strategy from "rubber boot" to "goretex". If it gets too bad on my wall, I will sand it down and repaint it with a new layer of silicate paint.

The silicate paint states that the diffusion openness applies to up to two layers of paint.


I hope my response makes some sense.

Good luck.

Also, keep in mind that regular putty doesn't work well in these contexts...