If you pull up some of those tiles you will see gaps in the mortar on the back of the tiles, revealing how poorly bonded they are. The grooves should be applied forward and back. Then the tile should be pressed down and shifted slightly from side to side in order to collapse the grooves. This gives the best contact without gaps. For any tile with a dimension of greater than 30cm, a thin flat layer of mortar must also be applied to the back of the tile. This is because tiles are not completely flat. The larger the tile the less flat it is. The floor should also be dampened with water so that it does not suck water out of the mortar. If you still do not get complete mortar coverage when you pull up a tile to check it then try using a trowel with deeper grooves. All this plus proper grouting between tiles will insure that the tiles do not become loose over time and that they will not crack in the corners or break if you drop something on them.
If you pull up some of those tiles you will see gaps in the mortar on the back of the tiles, revealing how poorly bonded they are.
The grooves should be applied forward and back. Then the tile should be pressed down and shifted slightly from side to side in order to collapse the grooves. This gives the best contact without gaps. For any tile with a dimension of greater than 30cm, a thin flat layer of mortar must also be applied to the back of the tile. This is because tiles are not completely flat. The larger the tile the less flat it is. The floor should also be dampened with water so that it does not suck water out of the mortar. If you still do not get complete mortar coverage when you pull up a tile to check it then try using a trowel with deeper grooves. All this plus proper grouting between tiles will insure that the tiles do not become loose over time and that they will not crack in the corners or break if you drop something on them.
Good work 👍
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