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@Hovis I did quite a few of these in my old flat and had some varying levels of success. Using the blue spring action lugs I found better than the standard yellow lugs. This guys explains it well: https://www.youtube.com/watch?v=UaSWNftCEc0
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I watched exactly the same video before embarking on our rewire - ended up finding the best result for the lath was accurately cutting box hole so that the box sits tight in it, then using expandable foam. Spraying lots of water first so you get a really strong adhesion with the foam and also pullin the cables pre-foam.
Once hard, cut back the foam to below the surface and filler.
Our flat is approximately 60% foam now. The rest is filler....
andos
terlg
@Hovis
Next question, anyone recessed a socket backbox in a lath and plaster wall? Any tricks or suggestions most welcome.