Marking Metal Back Boxes on Plasterboard

[leevis]

Hi
I have installed a load of back boxes (metal 40mm ones) onto noggins and need to put plasterboard over the top and then cut out the holes for the boxes

What the best method for locating these? Bang it to get it marked on the inside or careful measuring? Is there another no fail method?

Lee

 

[sircerebus666]

I press the plasterboard against the backbox and then cut out around the mark left

Others of course will have different ways of doing it

 

[sparkwright]

How about measuring it?

 

[JohnW2]

I press the plasterboard against the backbox and then cut out around the mark left

A bit of carbon paper (if one has any these days!) between plasterboard and boxes makes even clearer marks (and without have to 'bash' it too hard). It's decades since I last needed carbon paper for its intended purpose, but I always keep some for purposes like this.

Kind
Regards, John

 

[Swwils]

Wet finger around the backbox, smack the plasterboard in place, leaves an imprint to cut.

 

[333rocky333]

sure there was a gadget on dragons den once for that purpose

 

[Harry Bloomfield]

If the plasterboard is already in place and box hidden - try a metal detector to find the box. Easy to find the centre, then cut out from there.

 

[JohnW2]

If the plasterboard is already in place and box hidden...

That doesn't appear to be what the OP is describing.

Kind Regards, John

 

[Harry Bloomfield]

That doesn't appear to be what the OP is describing.

Kind Regards, John

Yes, I was fully aware of that.

 

[JohnW2]

Yes, I was fully aware of that.

I see

Kind Regards, John

 

[SUNRAY]

Chalk or the wet the box then smother it with dust off the floor.