Hello,
I own a house that contains a rented apartment on the upper floor. The entire house was centrally heated via an oil furnace and hot water radiators.
A few years ago we had a contractor install electric baseboard heating upstairs so the tenant could control and pay for their own heating. As a result the old radiators were removed and the water pipes leading up to the radiators were cut just above the floor level and capped since they were not required anymore in the upstairs lodging.
It was recently pointed out that the hardwood floor is discoloring (as if rotting) in the area around the capped pipes where the old radiators were. I have not noticed any condensation around the capped pipe and no leak is evident. This is evident in more than one room so it seems related to the capped water pipe. What could be causing this? Could it be condensation from the pipe, although it isn't evident when I inspect it.
Any suggestions welcome.
Basil