Cracks in tiled shower floor.

My youngest daughter has a unit and when I visited last she showed me the shower floor tiles. Cracks running across with some lifting, looks like the concrete slab has cracked/split. I plan to remove the tiles and relay some new ones. Is there anything that can be done to stop this sort of thing happening again or do we just keep our fingers crossed.

at best you can use a flexible adhesive with a latex aditive, however this ma not bridge the cracks in the concrete if they are bigger than a hairline crack..

also if the tiles are cracked the waterproof membrane may have been compromised and if the unit us above another unit (ie not ground floor) then the shower may leak into the downstairs dweling leaving your daughter open to legal actoin for repairs.

so it pays to get it repaired by a professional

Thanks for the reply. Its a downstairs unit, I've put a layer of silicon over the cracks for now doesn't look pretty but should keep the the water in. She's thinking of doing a renovation in the bathroom in 6 or so months so I guess the crunch will come then.