On 13/05/2013 20:54, Tim Watts wrote:
On Monday 13 May 2013 19:25 imanc wrote in uk.d-i-y:


I'm trying to fit 4 25mm back boxes into walls. I've pepper potted the
area with the drill

To a fixed depth? I wrapped tape around my drill as a depth marker when
doing this.

then used a cold chisel to clear out the plaster and
brick. However, the result is not smooth. There's a lumpy mess and some
cracked brick that is stil somewhat firm, and the back box doesn't seat
right. With one recess the back box is about 5mm too deep.

I'm wondering if I can build up the chase with some polyfilla or
something to make it straight and the right depth before fitting the
back box?

I know that an SDS drill with correct chiselling attachment would do a
much neater job, but I don't have one to hand.

I've got 3 more holes to chisel out so any advice would be appreciated!


I had the same problem on the odd occasion - when too enthusiastic with the
SDS or the bricks were a bit crap. Mix a bit of 4:1 mortar and lob it in the
back of the hole. Bed the box in to this. If you add a bit around the side
you can not bother with the fixing screw(s).

I keep an old bag of bonding plaster for such occasions... slap it in,
it goes off quick.


--
Cheers,

John.

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