There are a few probable causes but before you tear up the tile and start over try this quick cracked grout fix.
Repair cracked grout shower floor.
Choose your grout type.
Cracked brittle shower grout is an open invitation for mold mildew and stains to set up house.
If it is larger than one eighth of an inch use.
Step 4 mix grout.
While grout may crack from wear and tear an uneven or weak subfloor.
Grout comes in two primary forms.
It will take some time and effort to fix the grout but you will save money by doing the job yourself.
Apply the newly mixed compound to the holes created by the removal of the old cracked grout.
Is the grout between your floor tiles cracking or worse crumbling away.
If the grout keeps cracking in your shower you re going to want to fix it right away.
Remove all the loose and cracked grout with a grout saw or dremel tool and completely vacuum out the gaps.
This job can be done in just a few hours and will typically cost anywhere from 20 to 100 to complete.
Read on to learn how you can repair cracked shower grout in just a few easy steps.
However make sure that when you re fixing your shower walls you always wear eye protection.
Once the grout cracks for any reason it s time to repair broken grout before there is any damage to the surrounding tiles.
Before you begin measure the space between the tiles.
Step 5 apply grout.