In article snipped-for-privacy@news.diybanter.com, JohnB wrote:-
> I have purchased a wall mount for the screen, and some
> conduit to house the cables-
> -
> and a stone cutter attachement for a drill.-
>
> Don't even think about it on an occupied house - the dust will go
> everywhere and still be reappearing in a year.
>
> What I've done to get neat chases is to drill two vertical rows of
> holes about 25mm deep either side of the chase which act like
> perforations: you can then knock out the chase very easily (by han > or
> SDS chisel) without shaking up the wall to much or loosening great > areas of plaster.
> -
>
> Just completed this exact task ... although I used the lot's of holes
> technique to sink the box ... (use the envelope masking-taped under
> intended position to catch the brick dust); I 'notched' the two edges
> of the vertical channel with an 88mm? (SDS) chisel from Screwfix
> it's the same width as a single bac-kbox. This seems to give
> a line of least resistance so that plaster doesn't flake at the edges.
> The bits between the lines was hacked away with a 20mm SDS chisel > again
> from Screwfix. I did cover the floor below the work with a bin-liner
> bag masking-taped to the floor - {did I mention removing the carpet?)
> and had an assistant holding a work-shop vac near the chisel. There
> wasn't too much migration of dust.
>
> BTW; the vertical channel must; -
> #A;- go vertically iaw Regs ...
> #B;- line up with one of the knock outs on the box!
> It's unlikely that the box will have a knock-out centrally
> so; put the box where it'll line-up with the channel :)
>
>
> HTH
>
> --
>
> Brian
Thanks all, job was done as you recommended ( drilled holes 40 mm apar and chiselled out with 40mm chisel. Hardly any mess, and the grinde disc back in the toolbox ready for only outside job
-- JohnB