I fear this may cause a bit of eye rolling, but my questions is...if using tanking slurry on a damp concrete floor, does it have to meet the edge of the wall? I ask because the I'm loathed to remove the fitted kitchen, and the area under the cupboards is dry. I know the key word is 'tanking', as to fully enclose, but would there be any benefit it leaving this area to 'breathe'. My intention is to level after, then tile. Any help/info. would be very much appreciated