ToughButterCup Posted October 28, 2019 Share Posted October 28, 2019 The design of our (ICF -Durisol) house means that a small section of the insulated front wall is inside the house - inside the heated envelope. And why wouldn't we need to fix a back-box into the insulated part of the wall ? ....?, I mean come on this is our build, not anyone sensible, or someone with half a brain ... As you can see, the backbox is (in this case too small - 47mm one on order) sitting on the insulation. This is where the back box sits in the wall There's just over 200 mm of insulation and then concrete behind that. Its naughty to put electrics next to insulation innit? Do I have to dig out all the insulation and plug the gap with wood or something? Or can I just get a jinormous screw then drill through to the concrete and fix it in that? Or just knock the house down and start again..... Link to comment Share on other sites More sharing options...
PeterW Posted October 28, 2019 Share Posted October 28, 2019 Glue it to the wall then foam it in ... 1 Link to comment Share on other sites More sharing options...
Construction Channel Posted October 28, 2019 Share Posted October 28, 2019 Agreed. In the past we've made a batten that screws into the faceplate holes. Screw that batten to the wall either side to keep things flush and level. Then foam it Link to comment Share on other sites More sharing options...
Jeremy Harris Posted October 28, 2019 Share Posted October 28, 2019 I'd be inclined to stick a bit of thin ply to the foam (a bit of 4mm to 6mm ply would do) and then screw the box to that. PU bubble glue works very well for stuff like this. 1 Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 28, 2019 Author Share Posted October 28, 2019 37 minutes ago, PeterW said: Glue it to the wall then foam it in ... oooooowwwww ! ? assseasy innit ! 34 minutes ago, Construction Channel said: Agreed. In the past we've made a batten that screws into the faceplate holes. Screw that batten to the wall either side to keep things flush and level. Then foam it Foam ... I like that. 50 minutes ago, JSHarris said: I'd be inclined to stick a bit of thin ply to the foam [...] And I've even got the bubblegum errrr, glue Link to comment Share on other sites More sharing options...
ProDave Posted October 28, 2019 Share Posted October 28, 2019 Silly question: Are you plasterboarding the wall? Or "plastering on the hard?" Link to comment Share on other sites More sharing options...
Dee J Posted October 28, 2019 Share Posted October 28, 2019 Standard electrician's solution is some left over bonding coat plaster. Out of date bonding coat sets really quickly, so you don't have to hold the box in place very long before it's fixed. Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 28, 2019 Author Share Posted October 28, 2019 39 minutes ago, ProDave said: [....]"plastering on the hard?" Never ever the easy way, oh no ...... Link to comment Share on other sites More sharing options...
ProDave Posted October 28, 2019 Share Posted October 28, 2019 1 minute ago, AnonymousBosch said: Never ever the easy way, oh no ...... Then as above a big load of bonding plaster, mix it up thick and it should set pretty quick. Link to comment Share on other sites More sharing options...
RichS Posted October 28, 2019 Share Posted October 28, 2019 Muti-finish/skim plus cement 50/50 does the same 1 Link to comment Share on other sites More sharing options...
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