Sparkies how deep do i set backbox?

[veedee]

Wall has been taken my solid walls back to brick

It will be lime plastered in a few weeks

I'm currently fitting 35mm metal backbox

Considering it will be plastered in future, how deep should i set the backbox into the brickwork?

Or should i still aim for a flush finish?

 

[flameport]

The front edge of the box should be flush with the finished wall surface, so it depends on the thickness of whatever is going onto the wall.

 

[veedee]

The front edge of the box should be flush with the finished wall surface, so it depends on the thickness of whatever is going onto the wall.

Is there no room for error with this?

I set some other backboxes about 10mm deeper than the edge of the plaster wall finish. Can you not compensate for this with longer 3.5 screws?

 

[sparkwright]

Usually traditional plaster over brickwork is around 12-13 mm, so generally you want the box to stick out no more than that.

There may be exceptions though, where the brickwork is out of true, or there are door linings governing how thick the plaster should be.

 

[sparkwright]

Yes don't worry if the boxes are up to 10mm too deep or so, longer screws will fix that.

 

[veedee]

Yes don't worry if the boxes are up to 10mm too deep or so, longer screws will fix that.

Top man!

 

[Taylortwocities]

The plasterer will thank you for setting the box edge to be at finished plaster level. You will get a cleaner finish of the hole too, especially with lime plaster.

 

[veedee]

The plasterer will thank you for setting the box edge to be at finished plaster level. You will get a cleaner finish of the hole too, especially with lime plaster.

Thanks

I'll aim to set the box 22mm into the brickwork

Hopefully this puts me on the plasterers good side