Hmmm is this within Regs?

[securespark]

Why are you assume a metal back box, given that it's a plasterboard wall?

Could be dot and dab.

 

[JohnW2]

Could be dot and dab.

I've already acknowledged that that is a possibility ...

Well, to be fair, if it's 'dot and dab', I don't think that any builder would leave enough space for a decent depth of back box.

... but, as I wrote to Andy, the fact that that is a possibility was not really a reason to assume that the box (if/when it was there!) was necessarily a metal one, was it?

[someone subsequently noticed what may well have been a wall plug for attaching a metal box, which changes things a bit (albeit still not with any certainty), but that was after I made my comment]

Kind Regards, John

 

[securespark]

I think it is highly unlikely that anyone would use a dry lining box on D&D. You'd have to chisel away the adhesive where the tabs are as well as the blockwork behind. You could easily end up making a pig mess of the plasterboard. Far easier to fit a metal box.

 

[JohnW2]

I think it is highly unlikely that anyone would use a dry lining box on D&D. You'd have to chisel away the adhesive where the tabs are as well as the blockwork behind. You could easily end up making a pig mess of the plasterboard. Far easier to fit a metal box.

I agree that, if there is enough depth to fit a metal box without having to chisel the blocks, then a metal box would be easier (primarily because it doesn't seem possible to get dry-lining boxes <35mm deep), but I've seen it done.

Unless the plasterer had been unusually generous with his/her 'dots', I think one would be pretty unlucky to find one in the way of a dry-lining box 'tabs'!

Kind Regards, John