I am renovating an old bathroom. It's in a house built in the late 1950s in Germany. I have removed the bathtub. The bathtub was built in a box, which had tiles on the outside and this black material on the inside.

My question is: What is this stuff? Is it asbestos? I need to know, because if it really is asbestic-material I cannot dispose it along with the "normal" debries.

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  • It dosent look like any asbestos product I have seen, I know in earlier times straw was used right now with the photo resolution and contrast that's all I can think of.
    – Ed Beal
    Feb 21, 2018 at 13:10

1 Answer 1


This looks "Sauerkrautplatte", aka Holzwolle-Leichtbauplatte. It's made from wood shavings and cement, but no asbestos (AFAIK). They used to be common as a form of drywall and insulation (but are not anymore).

Wood wool lightweight boards (also called HWL boards ) are building boards that consist of long-fiber wood wool and mineral-based binders . HWL panels are used as plasterable insulation panels both indoors and outdoors. Colloquially, they are often referred to as "sauerkraut plates" or "sauerkohlplatten".

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