I became acquainted me with Zillow,com.. My house was built in 1945 (not 1958 as I had thought). The basement was made of cement blocks (actually the whole house, though the upper floors was made to look like pink brick). For years I have watched powdery residue slake off the basement wall. Seven years ago I had a new furnace installed. The code had changed; there was no longer a vent in the forced hot air system for the basement. I found this out after I got black mold on the wall and the smell of mold permeating the house..
The first dehumidifier It lost its compressor in a week. On warranty, I drove to the next state, the closest where repair could be done but not for several weeks. To keep me healthy and the house from rotting, I bought a twin of the first one. I used both, connecting one to the furnace pump, draining into a set tub. The second was turned on in very wet times but had to empty manually. Last year, my visiting son noted the two running dehumidifiers producing a lot of water. He told me cement becomes porous after many years it is leached. There is a great deal of moisture but no standing water..
Solutions are neither simple nor inexpensive. To repair the problem from outside, trenches would have to be dug around the foundation at a cost of 20K-30K. A second lesser cost but less effective solution was to paint a sealer on the basement walls. The basement, after 46 years of storage is like an obstacle course, otherwise known as a blivet. Trying to move things from the walls would take backbreaking work and incredible amount of time.
