Packing out back boxes

Longers · Mar 30, 2019

I have chased out some 35mm and 47mm metal back boxes into some walls made up of granite and mud. Some of the chases have gone too deep and was wondering what people use to pack out the boxes and to even them where the chased out box is uneven?

Cheers

Pete999 · Mar 31, 2019

ruston said:
Compo up here too Pete. I suppose it is short for compound.

Could be but this Compo was nothing more than a strong Mortar mix.

ruston · Mar 31, 2019

That's what we call it too. Same stuff .

Pete999 · Mar 31, 2019

ruston said:
That's what we call it too. Same stuff .

All these new fangled compounds, knock the knock outs you require, fit Grommet slap it in the hole, slap the box in, level it, fill in around the box, job done.

HappyHippyDad · Mar 31, 2019

Well I'm going to show off now and say I have never had to do that

When I see the brick/stone crumbling behind the back box I do the following...

1. Panic.
2. Slowly stop panicking.
3. Slow everything down and become very gentle with the remaining brick.
4. Drill new holes in the back box itself if needed, where I know there is good brick behind.
5. Drill out new holes in the remaining brick, starting with a smaller drill bit and working up, preferably not with hammer action.
6. Huge sigh of relief when 2 of the screws take a firm hold!
7. Cup of tea.

Squid · Mar 31, 2019

Dot and Dab for plasterboard sticks like an electrician to a £50 note......

ruston · Mar 31, 2019

SWD said:
Dot and Dab for plasterboard sticks like an electrician to a £50 note......

And is spot on for making good too.

Pete999 · Mar 31, 2019

happyhippydad said:
Well I'm going to show off now and say I have never had to do that

When I see the brick/stone crumbling behind the back box I do the following...

1. Panic.
2. Slowly stop panicking.
3. Slow everything down and become very gentle with the remaining brick.
4. Drill new holes in the back box itself if needed, where I know there is good brick behind.
5. Drill out new holes in the remaining brick, starting with a smaller drill bit and working up, preferably not with hammer action.
6. Huge sigh of relief when 2 of the screws take a firm hold!
7. Cup of tea.

Compo every time

SparkySy · Mar 31, 2019

I tend to use drywall mix for the odd issue like this, I find the thistle and the knauf stuff the best. The half hour set stuff is really good for quick patch too, low shrinking and you can finish it up with ease too!

buzzlightyear · Mar 31, 2019

Over time i have seen damp eat the back box .rising damp mr rigsby.

buzzlightyear · Mar 31, 2019

If you cant put a back box in correct
you has well may go on a beach to build a sand castle.

SparkySy · Mar 31, 2019

Had that the other day on an old cottage, rcd kept tripping low n-e insulation resistance found it on a badly corroded socket and box

[ElectriciansForums.net] Packing out back boxes

Rpa07 · Mar 31, 2019

Low expansion foam with a Fischer gun and a spray bottle to halt the expansion. Love the stuff.

SparkySy · Mar 31, 2019

I'm not allowed near expanding foam after an incident involving the Mrs and a considerable amount of it in her hair trying to do a camper van conversion