Hello,
What is the black paper that is everywhere in the house (built in '58)? In the basement, it has been placed under the concrete ceiling and then boards have been nailed on (quite sparsely), it is probably not original from '58 but was done later, maybe in the '70s. I can't quite make sense of what I read online, vapor barrier paper, wind barrier paper, roofing felt.... Names for the same type of paper or is there a difference between them, and if so what are these papers made of and what function are they supposed to fulfill? Anyone who knows?
No idea what it is but had the same under the plastic floors throughout the house here... so from the 60s or thereabouts. My guess was that it's supposed to remove drafts since the floors are a bit poorly insulated here. But hopefully someone else knows.
Black paper without any form of surface coating is asphalt-impregnated cellulose paper. Depending on the amount of asphalt per square meter, it is used either as a diffusion barrier (AC 350) or as wind paper (AC 150). "Förhydningspapp" was a general term for asphalt-impregnated paper. Underlay paper used as a waterproof layer on outer roofs always has some form of surface coating. The paper's identification code reveals its composition. Modern underlay paper may be labeled YAP 2200, which means surface-coated asphalt-impregnated polyester where the asphalt weighs 2200 g per square meter. In 1958, YAL 1200 was probably the most common. That is, the base consisted of rag paper and the amount of asphalt was significantly less. Before plastic film made its entry as a diffusion barrier in the 1970s, asphalt paper was what was available. Moreover, diffusion barriers weren't used until the 1950s.
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