There are a few probable causes but before you tear up the tile and start over try this quick cracked grout fix.
Replacing tile grout.
When remodeling a bathroom or kitchen the hardest part can be removing the grout from pre existing tile.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Remove all the loose and cracked grout with a grout saw or dremel tool and completely vacuum out the gaps.
This bathroom has some unfortunate and dated problems.
Grout is made from water cement and sand which hardens over time to form a rock like material.
Measure the space between the tiles.
A grout saw is a small handheld blade that fits between the gaps in tile.
Step 3 clean the seams.
Use a grout saw that has a blade with a width that will fit between the tiles you re working on.
Use a grout saw to remove the loose or damaged grout in between the tiles.
Use a grout saw to remove the top 1 8 inch 0 32 cm of damaged grout.
Begin by giving the tile a good cleaning with a sponge and soapy citric acid water as adescaling solution and use a toothbrush to deep clean grout to remove deposits and stains that may make removal more challenging.
Step 2 remove loose and damaged grout.
How to remove grout.
The old grout might be moldy and beyond cleanable.
There are a few good reasons why you might want or need to remove old tile grout.
If the space is larger than 1 8 of an inch use a sanded grout.
Use a spray bottle and some cold water to wet the areas where you removed the grout.
How to finish brick veneer with mortar.
How to replace mismatched tile grout.
Is the grout between your floor tiles cracking or worse crumbling away.
Gently run the grout saw back and forth along the grout seams.
Armed with this handy tool you can remove 15 square feet of grout on 4 by 4 inch tile in about one hour.
Indeed regrouting tile can restore lost luster and is well worth the time and effort.
Step by step instructions for applying grout to brick veneer joints as the final piece in the alcove project.
Fortunately it s well within the range of the average do it yourselfer to remove and replace grout.
Be careful to avoid damaging the tiles.
If the width is 1 8 of an inch or smaller use an unsanded grout.