A bit of background first: The house suffers a broken pipe second floor that floods the first floor of a Cape. Clean up and repairs complete, the water issues have been dealt with by a national clean-up comapny. Part of the cleqan up was to apply a polyeurithane to the ceiling of the basement, which is the first floor frame. A year and a half later, a fungus is growing on the eurathane A nice white and pale green color. Moisture levels are in the 10 to 12% range on the unsealed stair stringers. Anyone have a clue as to why? Or even has anyone seen this ? One thought was it was a reaction between the sealer and the cleaning chemical, but it looks like it is originating on the surface[?]
