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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
 
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Pete999

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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
Whip up some strong compo and bed the box into that, when compo is set, drill and screw as normal.
 

Pete999

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Hi Pete, what do you mean when you say compo? Not familiar with the term. Cheers
Sand, Cement and water, Brickie's brick laying mix but a bit stronger, add a dash of Washing up Liquid to make it more pliable. Slap it in the box hole, set box at the right depth and height allow to set then drill a fixing hole and strengthen the fixing, jobs a good one. I used to scrounge a bucket of "muck" from the cement mixer.
A pointing trowel was always part of my first fix tool bag.
 
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Sand, Cement and water, Brickie's brick laying mix but a bit stronger, add a dash of Washing up Liquid to make it more pliable. Slap it in the box hole, set box at the right depth and height allow to set then drill a fixing hole and strengthen the fixing, jobs a good one. I used to scrounge a bucket of "muck" from the cement mixer.
A pointing trowel was always part of my first fix tool bag.
Thanks Pete sounds ideal I will give that a go.
 

Pete999

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Thanks Pete sounds ideal I will give that a go.
It saves faffing about packing back boxes with bits of wood etc, need to wait for the Compo to harden, but on new builds it can save so much time. Good luck with it, sure iy will work for you.
 

123

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Be careful of using bonding if the wall isn't a cavity wall or is liable to get a little damp - the bonding will act like a sponge
 

Pete999

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What is it called Compo? I have never heard of that.
Muck,Compo, S---, Mortar, lots of names, we just called it Compo down in Bath Bristol area, why? I don't know, just know "go and get some Compo" was the order of the day when fitting back boxes, some Sparks used "Thistle Bonding coat" never rated that myself, couldn't beat a dollop of Compo.
 

ruston

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Muck,Compo, S---, Mortar, lots of names, we just called it Compo down in Bath Bristol area, why? I don't know, just know "go and get some Compo" was the order of the day when fitting back boxes, some Sparks used "Thistle Bonding coat" never rated that myself, couldn't beat a dollop of Compo.
Compo up here too Pete. I suppose it is short for compound.
 

happyhippydad

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

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.
 

Pete999

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

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

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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!
 

SparkySy

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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 IMG_20190318_1651435.jpg
 

SparkySy

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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:(
 

ipf

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Could be but this Compo was nothing more than a strong Mortar mix.
Anything with more than one ingredient is a compound...as with pyro compound...….but don't use that cos it'll take an age to solidify;)
Get some long 3.5's.
 

ipf

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Anything with more than one ingredient is a compound...as with pyro compound...….but don't use that cos it'll take an age to solidify;)
Could sort some bonding out......but only water, no gas.:rolleyes:
Get some long 3.5's.
 

davesparks

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

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.
8. Receive -------ing from the foreman/site agent etc for taking forever to fit one box.
 

telectrix

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loads of other good shows back then...minder, fools &horses dad's army, and loads more.now we have all this imported, septic crap. friends, and other daft yankee drivel
 

Pete999

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loads of other good shows back then...minder, fools &horses dad's army, and loads more.now we have all this imported, septic crap. friends, and other daft yankee drivel
Septic Crap, like it, be careful though the PC brigade may get upset.
 

Rpa07

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It’s the dumb English reality shows, now that is drivel and good for absolutely nothing but dumbing down society!
loads of other good shows back then...minder, fools &horses dad's army, and loads more.now we have all this imported, septic crap. friends, and other daft yankee drivel
 

telectrix

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my comment was no way directed at you pete, but at the cancerous pc brigade that want to turn us all into gender neutral zombies.remind you of the Borg?
 

happyhippydad

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8. Receive -------ing from the foreman/site agent etc for taking forever to fit one box.
9. Remind invisible foreman that's he's not real and just a figment of your previous professions imagination and now you can work as slowly, meticulously, autonomously and as happily as you like :)
10. Remind DS to say thankyou for taking the time to reply to his question regarding 2700K tape (albeit late and probably no help due to that fact).
 
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