I need to sink some boxes and cut a few chases in a plastered, solid,
wall. Previously, in modern houses, I've used a bolster, SDS chisel and
drill but this house has lime plaster which is very easy to damage, so I
was thinking of trying a diamond or carbide blade in my Bosch multi-tool.
Has anyone who has tried this got opinions about whether to use carbide
or diamond, or any other suggestions?
I have used carbide blades on breeze blocks and it works successfully, main
ly to mark the peripheries of the holes plus a few cross cuts before gently
chiselling out the remainder. Some boxes I sunk required no patching of th
e plaster such was the accuracy with the front plate completely covering an
Pretty well anything like that will do a clean cut into lime plaster. The
problem is the vibration etc cause chasing out the brick or whatever
behind it, if the plaster is not as secure as once.
For a delicate wall I tend to drill lots of small holes with an SDS drill.
Fine where you have plenty free time. But for many it might be better to
use a quicker way, and make good afterwards, as there's bound to be some
*i souport publik edekashun.
Dave Plowman firstname.lastname@example.org London SW
On 13/01/2019 21:58, email@example.com wrote:
Thanks for the responses. A TC blade in a multitool worked well on the
plaster but didn't touch the walls, which are built with particularly
dense concrete blocks. Stitch drilling the blocks with the SDS, and
breaking out with a scutch chisel, soon got the boxes sunk.
This is the first time I've used a scutch chisel, previously using
regular bolsters and SDS chisels - what a revelation! It almost makes
box sinking a pleasure.
When the house was built the sockets were on the skirting and the cables
were run in oval steel conduit. At some time in the past the wiring was
replaced with PVC, using the existing conduit. I'm raising the sockets
to about 480 mm so have had to carefully (using a dremel and nibbler)
cut the conduit open so the cables can exit just above the sockets -
fiddly but satisfying.
They must be some tough blocks. Sometime back I was running some conduit ou
tside my daughters house over some dressed stone facings which occasionally
required a slight groove cutting in the faces, having forgot my angle grin
der ( I know it was a cardinal sin for someone on this Usenet group). Anywa
y, I used the multitool and it certainly did the job outlining the edges of
the grooves, slower but certainly not struggling.
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