Nope, definitely solid all the way through, and a little thicker than 46mm I think...
Ha, no, these are my own walls I'm putting huge holes in!
Good to know that they're nothing wildly unique, construction-wise. The dual plasterboard layer on the party wall makes sense, the soundproofing...
Hello all, hopefully this is the right forum for this.
Recently moved into a new place, and I want to put up some shelves in an upstairs storage cupboard. The place was built in 1998 as part of a Housing Association estate, so I assumed it would be pretty standard construction with plasterboard...