My plasterer says the socket and switch boxes on first fix are too deep (25mm) for cement plaster (12.5mm). I tried chiselling 12.5 cavities but found the concrete blocks are hollow so the chisel goes straight through. Any solution to have flush sockets would be very welcome
socket boxes depth
- Thread starter Pigeon
- Start date
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Hi,
I can't say I'm familiar with concrete blocks with a wall thickness of around 12.5mm. Either be a little more careful with your hammer and chisel, or if you have to bash right through then cut the holes as close to the box size as you can and just no-nail the boxes into place, with the right offset of course. Err slightly under then over with the offset, a little more room is always welcome.
Rgds.
I can't say I'm familiar with concrete blocks with a wall thickness of around 12.5mm. Either be a little more careful with your hammer and chisel, or if you have to bash right through then cut the holes as close to the box size as you can and just no-nail the boxes into place, with the right offset of course. Err slightly under then over with the offset, a little more room is always welcome.
Rgds.
Perhaps you have multi-wall blocks? I have these, they are dense concrete, have an outer shell and a webbed internal wall dividing the block into several sections. If I go through the outer wall I pack the hole with sand and cement leaving a hole a bit bigger than the back box, then when it's set, I mortar in the box. They tend to crack if you try to chisel them so I drill the lattice of holes and joing then up with a bolster.
I would have thought this approach would also work if they are just hollow.
I would have thought this approach would also work if they are just hollow.
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Last time I used an angle grinder on my blocks, it made so much dust that I couldn't see the pencil line, and cut down the seam in the wallpaper which I mistook for my line 
I have decided not to use it indoors again
I have decided not to use it indoors again DIYnot Local
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