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Airhead
Thanks all.
@hugo7 it seems that a osculating multi tool is that tool, reciprocal saw or grinder too. I have a grinder and fill try that first. It is outside terrance on the basement, so concrete slab floor.
@Cupcakes I believe just bad grout and building quality, leading to cracking in the grout. It looks like a concrete grout. It's clearly been an issue as someone has covered the grout with a mastic sort of thing. An expoy grout should work. There is some cracking in the block wall underneath so some subsidence has happened, but hasn't moved more since I've been here so hopefully that's over. Honestly the whole thing needs to be knocked down and re done, but that's for another year.
@Airhead yeah but if a different job with 1cm grout strips to inside. I'll try a grinder, as I own one already.