Why does tile grout crack?

My grout is cracking, a contractor completed the tile installation in my kitchen, we had vinyl flooring, then it was removed and the contractor said the installation can installed directly to plywood. This contractor already came three times to repair the grout and like 4 loose tiles, but the grout still cracking. read more

Even properly installed tile floors and walls can be susceptible to cracking grout over time. Grout cracking is something you should take steps to deal with as soon as possible. The ability and cost to repair cracked grout is directly tied to how bad the situation has become. Worse yet, if the situation continues, the cracked grout will begin to affect the tile around it, causing more cracks and requiring you to replace the tiling. read more

Cracking grout in a newly tiled floor is a real letdown after all the work you put into it. The causes could range from a poor grout mix to a lack of expansion joints, to movement of the tiled surface. If the cracking grout is concentrated in a floor’s walkways, the likely culprit is floor movement, or deflection. read more