My first post. Hope this is the right forum.
I took over a wooden house built in 1941 less than a year ago. For some reason, the hot water to the kitchen goes up from the basement "in the middle of the floor" in a small passage. When I wanted to reroute it to be more hidden, I simply put the drill into the ceiling down in the basement. After admiring the sturdy wood for a while, some kind of black crumb started to fall out of the drill hole. It's not charcoal but just as black and brittle. Then, when I started removing old treetex on the lower floor, the same stuff fell out near the ceiling. Any idea what it could be? Black and crumbly like charcoal, as I said, but harder.
I took over a wooden house built in 1941 less than a year ago. For some reason, the hot water to the kitchen goes up from the basement "in the middle of the floor" in a small passage. When I wanted to reroute it to be more hidden, I simply put the drill into the ceiling down in the basement. After admiring the sturdy wood for a while, some kind of black crumb started to fall out of the drill hole. It's not charcoal but just as black and brittle. Then, when I started removing old treetex on the lower floor, the same stuff fell out near the ceiling. Any idea what it could be? Black and crumbly like charcoal, as I said, but harder.
Best answer
Kolasås, also known as kolstybb. I believe it is a byproduct from gasworks. Commonly used as insulation material at the time.