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You shouldn’t add new grout over grout that’s broken, cracked, or crumbling. If you do, the new layer might not adhere properly to the old one, and you could end up with even more grout issues. Plus, if you don’t remove the damaged grout, you’ll be ignoring whatever underlying problem initially caused the grout to crack, which could lead to more serious issues down the line.

Yes, mold can grow under your shower tiles if they aren’t thoroughly waterproofed. Even if you have a durable, non-porous tile material, water can make its way through grout or gaps around the edges of the shower. This will slowly erode the grout, which can cause tiles to come loose. It can also trap moisture behind tiles, and within a day or two, mold and mildew can rapidly grow.

Sanded grout contains particles of sand, making the grout more resistant to cracking. This durability makes sanded grout well suited for tile floors. It is also less prone to thinning out and forming bubbles when it cures, so you can spread it into larger joints.

Unsanded grout is much smoother, so you will want to use it when working with tile made from glass or polished stone. Any sand could leave scratches on the tile’s surface. The lack of sand also makes unsanded grout thinner, making it best for tile joints that are less than one-eighth-inch thick.

Bathroom mold tends to reappear due to the persistent presence of moisture and humidity, creating the ideal conditions for its growth. Since bathrooms are inherently humid environments, without proper ventilation, moisture accumulates on surfaces, providing a continuous food source for mold spores. Mold spores are present in the air and settle on damp surfaces to start growing rapidly. Additionally, if the underlying causes of mold, such as plumbing leaks or inadequate sealing, are not addressed, mold will return even after removal. To avoid recurring issues, addressing the root cause by improving ventilation, fixing leaks, and maintaining a dry bathroom environment through regular cleaning and maintenance is essential.