My house was a small renovation that turned into a total renovation.
Recently, I removed radiator pipes and some mortar/lightweight concrete came with it. Inside, I could see one of the beams that runs over the basement. The wall to the right is an exterior wall. Straight ahead is a former shower room with a basement underneath. The floor is insulated with mineral wool.
When I stick the beam with a knife, it goes about 1-2 cm in. The beam crumbles very easily.
About 40cm further in (from what can be seen in the picture), the beam looks fine and sticking a knife there leaves just a mark.
How should this be addressed?
ps. hope this is the right forum and that the pictures are good enough (the light and camera didn't quite cooperate)
ds.
