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How to run wires behind "Plaque de plâtre" with styrofoam backing?


hstraf
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Hello,

I need some help understanding what is the best way to run wires behind the wall. (I need to add two new electrical plugs.)

The wall is built with plaque de plâtre (gyprock) that has a 10cm backing of rigid styrofoam (polystyrene), which is then glued to the cement blocks.

I thought perhaps I could heat up a fishing weight and drop it down the back of the plaque de platre to melt the Styrofoam and create a tunnel... but in this situation I need to run the wires horizontally, not vertically.

Any ideas how to do this?

Thanks!
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Yes,  Pass a few strands of iron wire through behind the placo, connect them to a few car batteries and when they heat up it will melt the polystyrene causing it to shrink back and allow you to pull the gain through. Alternatively you'll have to hire me and my specialised equipment to do it.

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Really, there is somewhere an overpaid, over opinionated, overhead actually passing rules?  ;-) to stop people who have insulated plasterboard changing the socket/switch layout, as you say how are they going to check.

It's a problem so I made a heated (electrically) tool for the job. safer than overheating anything as it's thermostatically controlled and works very well as it doesn't cool down like manually heated versions which then require a second or third insertion which I found in the early attempts often then went off on a slightly different route. 

But then fishing and electricians, do they really believe they can out think a fish?  (big smile)

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it may be on sale, indeed i even have one, but it is no longer DTU conform. That is, for new builds or reno jobs that include changing more than 30% of the existing surface and thus engaging the RT2012 new regulations...

But like a lot of things in France, they just tend to ignore the rules, so when in Rome!!!
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