We have a 1960s house with exterior walls that have wallpaper on the inside, 19mm particle board, and then the asphalt paper in the picture before the insulation. Outside the insulation, there is a wind barrier and then paneling. Now we have added more electricity in the walls and need to replace the asphalt-coated paper. I'm unsure if it is diffusion-tight and if it can be replaced with plastic. Does anyone in the forum know what it might be and where to get a new one?
Windproof fabric is best, not asphalt felt as it just breaks, the fabric can withstand rough handling. and the one that's there acts as a windbreak, similar to the one inside the outer wall.
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