Keeping a tiled shower looking good requires regular maintenance. Most people don’t know that shower tile grout must be resealed every 6 months. If not it becomes porous, absorbs water and can crack causing leaks.
Grout can deteriorate from aging, poor installation and expansion from changes in temperature. This can lead to mold behind the tiles, damaged walls and missing grout. It may also require replacing the tiles.
Missing grout is a sure sign that re-grouting is needed. Mold and other staining is a sign that your grout needs either cleaning or resealed.
Other red flags are a musty smell or obvious water damage and loose tiles. These items need to be addressed to avoid more costly repairs.