Is it safe to install tiles without grout lines so it looks like marble, i have heard tiles crack if no grouting is done
Gases form under the tiles when installed. Without space for grout line, these gases have no way to escape and pressure is developed. It can result in tiles leaving its place.
Never ever do it.
@ B.R Malik
Thanks
Welcome. Also, when tiles are installed, it’s left for a day so that gases from dry bond evaporate. If filling/grout is done immediately, no space left for gases.