what's going on in our basement
We are first time homeowners and live in a semi detached house built in 1947. The previous owners finished the basement (playroom and bathroom) except for a small room which is used for storage. It also houses our hot water heater and furnace.
The floor in the storage room in the basement (which was painted grey by the previous owners) is cracking and bubbling up. I have included pictures.
There seems to be a lot of powder all around the area when we prod it. The white section of the spot is hard but with that powder substance over it. The dark spots are wet. When the paint around the opening is prodded the paint chips off and it seems to be wet underneath.
Could it be pyrite? Or is the house too old for pyrite to have been used in it's construction?
What seems to the be problem? Is water seeping into the house from the ground?
How can this be fixed?
Any advice or suggestions would be greatly appreciated. Thank-you