1st fix

[mjtefc9]

Probably a stupid question.. but builder is putting stud against breeze block then plastering. ( Needs to build it out slightly )

Thing is, how do I go about 1st fixing this as there will be no back boxes to leave my cables in?

I'm training to be a spark.. and this is on my own house.. so I'm good with the regs and wiring...

 

[JohnW2]

Probably a stupid question.. but builder is putting stud against breeze block then plastering. ( Needs to build it out slightly ) ... Thing is, how do I go about 1st fixing this as there will be no back boxes to leave my cables in? .... I'm training to be a spark.. and this is on my own house.. so I'm good with the regs and wiring...

Assuming that you can roughly estimate where the finished wall level will be (after plastering), couldn't you fix metal back boxes to the breeze block (and then listen whilst the builder curses about having to cut his plasterboard around them ) ...

OR, if you want to use 'plasterboard boxes' ...

... 'lightly' clip the cables (of adequate length!) to the breeze blocks where you want the accessories to be (lots of photos, diagrams and measurements ) and then, once it is boarded, cut carefully through the plasterboard (being careful not to damage the cables!) and pull the cables out.

Kind Regards, John

 

[mjtefc9]

Assuming that you can roughly estimate where the finished wall level will be (after plastering), couldn't you fix metal back boxes to the breeze block (and then listen whilst the builder curses about having to cut his plasterboard around them ) ...

OR, if you want to use 'plasterboard boxes' ...

... 'lightly' clip the cables (of adequate length!) to the breeze blocks where you want the accessories to be (lots of photos, diagrams and measurements ) and then, once it is boarded, cut carefully through the plasterboard (being careful not to damage the cables!) and pull the cables out.

Kind Regards, John

Thank you John!

I think they will be boarding further then a metal backbox would allow.. so it will be photos and measurements!

 

[oldbutnotdead]

25mm studs, 12.5mm board- sounds like a job for 35mm backboxes to me.
Alternate plan (if yr builder bitches too loudly) is 25mm backboxes, careful measuring so you know where they are and cut the holes after he's boarded.
Just read your last post- either use 50s or fix wood to the blocks and backbox to wood.
Or go drylining boxes (yuck).
Or sidefix metal boxes to the studs

 

[mjtefc9]

Just measured and I think it will be about 100mm from the block then he is putting insulation board in-between. Reason for the distance from the block is there are gas pipes along that wall ( Garage conversation )

 

[oldbutnotdead]

I think he might have to stop right there- there are rules about burying gas pipes. I believe they have to be in a space ventilated to fresh air (or in specialist ducting).

 

[mjtefc9]

I think he might have to stop right there- there are rules about burying gas pipes. I believe they have to be in a space ventilated to fresh air (or in specialist ducting).

Right.. Okay let me have a look

 

[JohnW2]

Thank you John! ... I think they will be boarding further then a metal backbox would allow.. so it will be photos and measurements!

Just measured and I think it will be about 100mm from the block then he is putting insulation board in-between. Reason for the distance from the block is there are gas pipes along that wall ( Garage conversation )

Backboxes obviously come in different depths (all the way up to 47mm or so), and there's no harm in having one deeper than is actually needed. However, if the gap is still too great (like the 100mm you mention), then you can simply put a bit of wood behind the breeze block and backbox, as required.

Kind Regards, John

 

[mjtefc9]

Backboxes obviously come in different depths (all the way up to 47mm or so), and there's no harm in having one deeper than is actually needed. However, if the gap is still too great (like the 100mm you mention), then you can simply put a bit of wood behind the breeze block and backbox, as required.

Kind Regards, John

That sounds like a plan...

I've spoken to the builder.. and he is boxing in the gas pipes and the consumer unit.. allowing ventilation

 

[mjtefc9]

This is the wall

 

[sparkwright]

Ask the builder to fit wooden noggins between the studs, set back at the correct measurement and fit the boxes to these.

 

[mjtefc9]

Ask the builder to fit wooden noggins between the studs, set back at the correct measurement and fit the boxes to these.

Thanks pal..

He is coming tomorrow so will ask him.. if not I'll get some 47mmx47mm timber and use that to attach back boxes to..

 

[JohnW2]

Thanks pal.. He is coming tomorrow so will ask him.. if not I'll get some 47mmx47mm timber and use that to attach back boxes to..

Whilst that would undoubtedly 'do', I would think that you would probably do better with something like 45mm x 95mm, so it's wide enough to support the full height of a backbox.

Kind Regards, John

 

[mjtefc9]

Builder came.. just said mark on the wall where I want the sockets and they will build it out for the back box... Thanks for the help everyone

 

[Taylortwocities]

Builder came.. just said mark on the wall where I want the sockets and they will build it out for the back box... Thanks for the help everyone

Lordy, a helpful builder. Wonders will never cease!