cutting out weak plaster - best way

[NickB_99]

hello all.

In the past I've needed to do a spot of repairing of plaster cracks. I've usually cut an area out round the crack and gone back to blockwork for repairing.

So far I've always used a stanley knife to make the cuts, but this is time consuming (especially to get through the skim), and the blades blunt very quickly etc.

I currently have a builder in doing a spot of work. I notice he's got a little cordless grinder/cutter that has a rotating disk about 1-2mm thick.

Has anyone tried something like this to speed up the job of cutting plaster back? Or is it too heavyweight for the job and too likely to damage to blockwork underneath?

Always in favour of the right tool for the job. Even better if it can reduce the effort and speed things up.

 

[Richard C]

Any type of disc cutter will work but will create a huge dust cloud; I just use a club hammer & either a cold or bolster chisel for dressing back prior to plaster repairs.

 

[roughcaster]

I prefer to cut back plaster, using the stanley knife, and then roughen the edges of the original plaster, tapping it with a small hammer and chisel/screwdriver,, anything,,, just to take away the "clean cut" of the edge. It gives a better key for the new plaster to grip onto. It's different with harder render,, using the grinder makes it easier to cut,, but i would still trim/chip the edges to roughen them up

Roughcaster.

 

[bathstyle]

Stop nitpicking

I assume the Builder had a fein multimaster or the Bosch thingy with a carbide blade on it?

 

[NickB_99]

I assume the Builder had a fein multimaster or the Bosch thingy with a carbide blade on it?

you were very close on the tool - looks like one of these babies....

http://www.pvrdirect.co.uk/productinfo.aspx?catref=BGA452SFE&gclid=CNyz0oPVl50CFVZe4wodYBhZcQ

Tho the blade was changed from a grinding blade to something a bit thinner - about 1-2mm.

A bit pricey tho!