I found some material (pictures below) that I'm concerned might be asbestos, while demolishing the ceiling of a house in the UK which was built in the 1920's.
The material looks like concrete, but it has some brown hair-like material mixed in.
Does this look like asbestos
asbestos
Related Solutions
No. That looks like polyisocyanurate:
Asbestos looks like any of these, depending on which form was used in what kind of location:
Based on your description, your basement walls likely have no asbestos in them. But that's the least of your worries; a crumbling foundation is a major problem! This is not a DIY job unless you are have professional experience with structural engineering, foundation repair, and concrete pouring. Call in a pro. And make sure this doesn't happen again by improving the drainage outside of the basement. There are many ways to do this, from improving the grading to installing drain tile to building a subterranean roof. It all depends on the conditions at the site.
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Best Answer
No, it is plaster with animal hairs in it, probably pig or cow hair.
To determine if there are asbestos fibers inside the plaster, break it apart and examine with magnifying glass. Asbestos is a fine white fiber. It looks like this:
The fibers on the right are asbestos, those on the left are animal hairs. Asbestos fibers will be colorless, very fine and clumped together, like in the photograph. Animal hairs tend to be by themselves and have color. Notice that an animal fiber will be rounded, but asbestos tends to be stiff like a corn stalk with crinkles or breaks in it.