I have a basement wall that was previously repaired with some material, and after measuring, we found moisture in this wall, as the downspout didn't have a stormwater drain to divert the water. The house has a Platon membrane.
Anyway, first and foremost, I don't think the basement is painted with the right paint as it is quite easy to remove and is coming off the plaster.
However, I began digging a little into the wall and removed the previous repair, and I can dig a bit in before it becomes hard. Do you know how basement walls from a 1940s house typically are? According to the building plans of the house, there is a 25 cm cast concrete foundation with 4 cm Nikeplates on the inside at ground level and upwards. In the picture below, you see where the Nikeplates start. Understandably, there isn't much holding these Nikeplates together anymore; they have done their job.
But underneath, is it plaster or is it real concrete? Because I think you can scoop out a good bit before it becomes hard. It feels a bit concerning, and you get a bit worried. Is it common in old houses to be able to do this? Should I be worried? It's worth noting that it is mainly the repair of some kind (like new concrete or something) that I have pried away, but behind it was initially a bit porous, the outermost part at least. Then it seems to become harder.
And yes, we will re-drain the whole house, even though it was drained in 2001. Moisture is starting to come into one of our basement walls. The others are still dry, though.
