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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
 
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!
 
I'm not allowed near expanding foam after an incident involving the Mrs and a considerable amount of it in her hair
Packing out back boxes {filename} | ElectriciansForums.net
did your Mrs look like that ,LOL,a bad hair day or what .
 
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.
 
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.
 
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.
 

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