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Peter Purr

wrote:
It's either cast in situ concrete (a lot more than an inch) or
prefabricated concrete floor beams (don't know if that was used in the
1970's) also a lot more than an inch. If so, any wooden ceiling joists
are only designed to hang plasterboard from - not chairs/people.

It looks to be concrete, as I describe in another post.

--
Peter Purr