Ask questions and get answers from experienced industry professionals
Cracks can occur for a multitude of reasons. I would recommend hiring a home inspector to take a look at your situation and get his professional unbiased opinion.
Typically, you do not want to cover existing grout. You will need to remove the old grout and apply your new colored grout. A tile contractor can help you with this project. Please let me know if you have other questions.
Are you a building professional?
Why not answer these questions like a pro?Sign up free