Filling hole over wiring - dot and dab board

[JB-BJ]

Good evening,

I'm looking to fill a hole which is cut in plasterboard, which itself is dot/dabbed over some kind of breeze block. This is all to go behind the chimney of a kitchen extractor fan, so will be partially hidden anyway. The fan itself will be held up with corefix, but I'm in a few minds over how to go about filling the required areas. I know I can't fill over the junction box.

So far, plan is;

- Expanding foam under the edges of the floating plasterboard to give filler something to sit against.
- Guardzz on all surfaces
- Toupret interior filler over the section highlighted in red box, in layers perhaps just to help with drying.
- Decorate

My concern is that it's an external wall, and I'm mindful that the filler over time could suck moisture through. I don't know if there's a better filler? Note that the wires are shallow, so I can't fill in sections of plasterboard and skim.

Any suggestions welcome.

Note that the wires are shallow so not deep enough to replace sections of plasterboard.

 

[Murdochcat]

That JB is not suitable for that installation nor do the cables appear to be in safe zones

 

[pete01]

Are you planning on covering the junction box because you shouldn't as it's not maintenence free.

 

[pete01]

That JB is not suitable for that installation nor do the cables appear to be in safe zones

Beat me to it

 

[JB-BJ]

That JB is not suitable for that installation nor do the cables appear to be in safe zones

I'll be sure to inform whoever rennovated the kitchen 15 years before I moved in.

In the meantime, I expect my electrician will deal with the wiring and junction box removal when he comes next week to inspect, but to my knowledge he isn't a filler expert.

 

[JB-BJ]

Are you planning on covering the junction box because you shouldn't as it's not maintenence free.

No, hence why I said;

I know I can't fill over the junction box.

My electrician will be removing the junction box and making good any works next week, before I do any filling.

 

[pete01]

No, hence why I said;

Oh ok you gonna make a feature of it