Cutting recess for double-socket in brick.


M

mark.hannah

I am fitting a double-socket in my hallway, and the metal pattress box
is 25mm depth.
The wall is 15mm plaster on top of brick - I have already cut away the
plaster to the correct shape using a bolster - question now is how do
I get the brick out without destroying loads of plaster?

I started by making several parallel horizontal cuts with a grinder
and knocking them out with the bolster - but now I have a "bowl" shape
in the brick where it is at the correct depth in the middle, but not
the edges.

What's the best way to cut out the edges without removing lots of
plaster?

Thanks,
Mark.
 
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L

Lobster

I am fitting a double-socket in my hallway, and the metal pattress box
is 25mm depth.
The wall is 15mm plaster on top of brick - I have already cut away the
plaster to the correct shape using a bolster - question now is how do
I get the brick out without destroying loads of plaster?

I started by making several parallel horizontal cuts with a grinder
and knocking them out with the bolster - but now I have a "bowl" shape
in the brick where it is at the correct depth in the middle, but not
the edges.
Probably difficult to do now, but what you should have done (sorry!) is
use a masonry drill to mark out the corners, and then stitch-drill (ie
honeycomb) the whole area. Should then knock out easily with a bolster.

Maybe you've enough 'meat' left at the cormers and edges still to be
able to do this?

Whatever, you're lucky if you manage to make the whole hole without
damaging the surrounding plaster at all - normally needs some making
good afterwards. In any case, you've normally got chasing to fill,
where your cable runs.

David
 
M

mark.hannah

Probably difficult to do now, but what you should have done (sorry!) is
use a masonry drill to mark out the corners, and then stitch-drill (ie
honeycomb) the whole area.  Should then knock out easily with a bolster.

Maybe you've enough 'meat' left at the cormers and edges still to be
able to do this?

Whatever, you're lucky if you manage to make the whole hole without
damaging the surrounding plaster at all - normally needs some making
good afterwards.  In any case, you've normally got chasing to fill,
where your cable runs.

David
Thanks - I'll see if this will work tonight!

Mark.
 
D

Dave Liquorice

Drill lots of holes along the edge. 5mm or so in diameter. An old 1"
wood chisel - reasonably sharp - will cause less damage elsewhere than a
bolster.
Or better still a sharp 1" cold chisel. A bolster spreads the impact over
to large a line to cut out brick effectively. A smaller chisel will work
much more effectively, always assuming these are ordinary soft house
bricks not engineering brick. B-)

Good hefty hammer as well, 4lb lump hammer or similar. And eye protection.
 
M

mark.hannah

Probably a bit late now but that is one of the reasons I bought a cheap SDS
drill.http://www.argos.co.uk/static/Product/partNumber/7110247/Trail/search...>SDS.htm
were doing this for £19.99 last year.
I had 7 double sockets to do so invested in one.
Initially I went round the hole with an old wood chisel to cut out the
plaster then the SDS drill removed the brickwork underneath. It was so easy
to do, I only had to plaster a tiny part of one of the holes.

Steven.
Superb.
That's the justification I needed to buy an SDS drill!

Mark.
 
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T

The Medway Handyman

Dave said:
Not if you wish to minimise surrounding damage. They're brilliant
devices but not for precision engineering. ;-)
True enough, but using one to chain drill the outline, then a chisel bit on
roto stop to cut the outline works a treat.
 
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