I have a ceramic tiled bathroom floor where quite a few tiles in the centre, mostly where the heating element is located, have become loose. Much of the grouting has crumbled away but although some of the tiles could be lifted out the heating cable is often embedded in the adhesive layer that remains on the bottom of the tile or, sometimes, on the false plywood floor that was laid for the tiles to be bonded to. I'm guessing that as several of the tiles are already very loose and the grout it already missing in many places I might be able to skip drilling the holes and with it the potential for damaging the heating element. Does that sound reasonable? I assume the drilled hole is mainly required to allow the repair adhesive access to the void between the tile and the underfloor. In my situation that is already quite well exposed in most cases. I would also assume that the new Adhesive will effectively bond together the disturbed original bonding/grouting under the tiles (in so far as it is able to spread in that area along voids and cracks). Am I making some assumptions too far? To do anything to replace the floor from scratch would mean a lot of disruption and probably end up as an entire bathroom replacement exercise. I would prefer to have it last a few years longer as I'm not that keen on pure white bathroom suites! So if something like the repair adhesive has some chance of working I would be willing to give it a try to see what happens. All observations and suggestions are welcomed.