Only reason I say that is I've been to so many that have just been 'stuck' down and they invariably move and then the pan connector seal goes or the close coupled seal goes and then it leaks.
People just don't stay still on the toilet either and if the person is of the larger persuasion then an adhesive on it's own will invariably give way.
Thank You, Yes I know what you mean......I've tried drilling it with a hammer drill, and new masonry bits, to no avail, normally you can send a smaller bit through, and then enlarge it to the recommended 10mm......I did the floor some years ago, with self levelling compound onto the concrete, but God knows what's in, or under that concrete.......
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