Removal of plaster lip?

[wolfwiser]

Hi there,

I've removed some old skirting which has left a void, this has been filled with plasterboard and patched with bonding coat plaster. I now want to have the wall re-skimmed prior to adding the new skirting (which will be at a lower height). A problem is that the walls have been previously re-skimmed whilst the old skirting was in position, this has caused a lip which I want to remove so the walls will be flush.

Do you have any tips as how to use this lip? I'm afraid a hammer and chisel will crack and damage the wall too much, I was thinking a plane rather than sander....?

I've quite a long run of this so the easier the better, the lip is ~15mm in places and cannot be skimmed over.

I've tried to demonstrate in the pictures below:

Untitled

• wolfwiser
• 29 Jan 2015
• 1

any info welcome - cheers!

 

[roughcaster]

A hammer and a bolster, even a scutch hammer, all used carefully by someone who knows what they're doing, will work perfectly.
A planer or a sander will be a waste of time, and i would say, not be effective at all. To remove/feather away that "lip", you will need to chip away the plaster a good few inches up the wall/along the affected length of the wall, to get to the same plane, checking it out with a small  straight edge as you go. I'd let your plasterer do it. He'll know what he's looking for and will sort any problems along the way.
I also "would not" have bothered using a strip of plasterboard along the bottom of the wall, i'd have filled it all in with bonding coat, thus eliminating a joint between the plasterboard strip and the new plaster. Also, remember "not" to plaster right down to floor level, I always leave a 20mm/30mm gap.