This novice would be grateful for any tips you may be able to provide.
We live in Minneapolis and have a 1916 two story home with a basement
that, to my inexperienced eye, is either poured concrete or cinder
block. Much of it is obscured by two thick layers of waterproofing
paint (one white, one blue). That paint is the problem.
In some areas, the paint is very much intact. In other areas,
however, it is bubbling and flaking off. This activity seems to be
occuring along the two walls that don't have porches above them to
divert the external water. Worse, in some of the areas where the
paint has flaked off entirely, we can see that the concrete underneath
has become very crumbly and will fall apart with even a fingerpoke,
resembling light brown sand or dirt.
Despite all of this, I'm very happy to report that we've only had
water in the basement on two or three occasions in seven years (after
100-year storms). The rest of the time, the basement is just a little
damp, which we address with a dehumidifier. Our major issue with the
basement is not that it is wet. It is that the perpetual flaking of
paint and small pieces of concrete make it a nasty, dusty, grimy
(1) Does the crumbly concrete suggest that a major structural issue
with the walls is brewing?
(2) Assuming we don't have a major structural issue, how do I stop the
flaking and crumbling? Do I have to strip the entire wall of all the
old waterproofing paint, even the stuff that looks pretty good, and
then apply some new stuff? Or can I just patch the crumbly spots with
quick-setting concrete and paint over it with Drylock or some similar
product, leaving the intact painted areas alone?
Thanks in advance for your ideas.