I live in a house from the 1920s with an extension from the late 40s.
We're currently renovating a bit in the extension part and it seems like there's tretex in the walls if I'm not mistaken. But around the windows and along the floors, I also find some type of fibers that I guess were used for caulking/insulation in some way.
Has anyone seen anything similar and knows what kind of material it is?
