Quote Originally Posted by dr. d View Post
if the water is seeping in from the other side of your wall,
you will have to do something on the outside, to prevent the water from seeping into your concrete wall. painting it on the inside will only work for a short time.
it is also possible, that your neighbor has the same problem with his wall.
if so, you should join forces. install a cover between your two walls, to divert rain from both your wall exteriors so that rain water won't be able to fall in and seep thru both your walls.
Agree with you Doc, probably they are firewall to firewall. They need to put a capping on top of the exterior wall to prevent water seepage.