At most tile specialty shops you can get or order sanded caulk most floor grouts are sanded that will closely match your existing grout color.
How to fix grout between floor tiles.
Use a grout saw that has a blade with a width that will fit between the tiles you re working on.
Make sure not to apply any pressure to the tile so you don t break it while you are doing this.
How to touch up grout.
Take a grout saw and remove all of the existing grout from in between the tiles.
Tile can last for generations but the grout lines sometimes need attention.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Step 6 install grout.
Most grout is a porous cement based material that can crack and crumble over time especially.
In short sanded grout should be used if the space between tiles is more than 1 8 of an inch but not on metal glass or marble tiles and unsanded grout should be used if the width is less than.
Grout is available as sanded or unsanded.
A grout saw is a small handheld blade that fits between the gaps in tile.
Use a grout saw to remove the top 1 8 inch 0 32 cm of damaged grout.
1 measure the width of the grout lines on your tile floor.
This material can become damaged over time and it will likely require a bit of repair to restore it to its original state.
Measure the space between the tiles.
If the space is larger than 1 8 of an inch use a sanded grout.
Once the old grout is removed use the grout float to fill the empty joint.
This fix is only practical for interior tile floors and when the gaps between the tiles are 1 4 in.
If you need to repair grout numerous times on any one floor ask an engineer to look into the underlying cause of the problem.