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What Are The Reasons For Piled Up Water Under Floor Tiles?

You walk into your washroom and you notice that the tiles are a bit wobbly. This gets you thinking if there’s an issue with the tiling. Well, we might know what’s going on. So let’s check it out!

How do you know if there’s any water under floor tile?

First, you should see if there are any signs of water damage. Check whether the tiles are uneven or wobbly. Also, see if you see any growing mold or grout damage. If you do, then that’s a sign. In this case, you have to take out the tiles from that area. 

These are basically the rundown of the reasons. To know how to fix this issue, scroll down below! We have detailed an entire article just for that.

Signs That You Have Water Under Your Tiles

Firstly, you need to make sure whether you have water under your tiles or not. Start by checking whether or not there are any loose tiles. If they are wobbly, it might be a sign of water damage.

Moreover, if you see drips of water coming from the wall, this might be an indication. Also, check for unevenness between your tiles or any deformities. 

You can also go up to your crawlspace or basement. See if you find any water damage on the wall. If so, you need to take action immediately!

Furthermore, check for molds or mildew on your tiles. Since the area is moist, it can become a breeding ground for these. So, if you see, this might be a clear sign of water damage.

Grout damage can cause water to seep through and cause this. Hence you should always fill in the gaps whenever you see any! Otherwise, it can damage your structure. 

Also, look for cracked or broken tiles around the space. This might also allow water to enter through and pile up.

Another thing you can check for is pipe leaks. Draining leakage is one of the common reasons for water under your tile. Now to find the leak area, you need to find the place that’s damaged the most. Follow that and find the source of the leakage!

How To Get Rid Off The Water Under The Tiles

Now you have to first locate the place with the most water damage. Use the signs mentioned above as indications of the damaged place. We’ll start our work from there!

But we need some tools first so, let’s start there!

Tools Required

Here’s the list of the tools you’ll need for the entire process:

  • Rubber mallet
  • Chisel
  • Wide Putty Knife 
  • Thick towels
  • Caulking
  • Plumber’s Putty
  • Filter Mask
  • Rubber Gloves
  • Bleach
  • Dish soap 
  • Wooden spoon
  • Scrub Brush
  • Wet vacuum
  • Thinset 
  • Metal Trowel
  • New tiles (if damages)
  • Tile spacers
  • Grout
  • Clean White Cloth

Step 1 of 4: Taking Off The Grout Or The Tile

First, use a chisel to remove the grout. For support take a rubber mallet and tap on the chisel. This will help to remove it quickly.

Then, use your rubber mallet in a similar way to remove the tiles. However, instead of a chisel, use a putty knife. Tap on the head of the knife and the tile will come off. 

Now, repeat this process for all the tiles with water damage. 

Step 2 of 4: Clean & Smoothen The Damaged Surface

After removing all the tiles, you need to clean the area. Take a few thick towels and lay them over the damaged parts. If they are soaked, change into new ones until there’s no moisture left!

After that, you need to prepare the area for tiling. Use your putty knife and mallet to remove the thinset. Scrape off any other fragments to ensure an even surface.

Step 3 of 4: Cover Up Any Leaks & Clean The Mold

After you’ve smoothened everything out, it’s time to seal any leaks.  To stop it, you need to use caulk and plumber’s putty. 

Now, you have to clean the mold and mildews. But first, you need to wear a filter mask and rubber gloves. 

Make a concoction using ½ cup bleach, 3-4 drops of dish soap, and a quart of water. Using a wooden spoon stir the mixture. Take a scrub brush and in a circular motion scrub away the molds. Make sure there is no mold left to grow!

After this, use a wet vacuum to vacuum the area. Open out the windows to get rid of the bleach smell. You can now take off your mask and move on to the next step!

Step 4 of 4: Lay The Tiles Back On

Now, mix in your thinset, according to the user manual instruction. But make sure you’re using a strong thinset for this. To help out, we have recommended some:

Product 1
Product 2

Using a metal trowel, apply a thin layer of this mortar on the clean, smooth surface. After that, place the tiles. But first, if the tile is not damaged by the water you can use it. Otherwise, you need to buy some new tiles.

Layer all the tiles, one by one adding spacers. Now, leave it overnight to dry! Now grout and seal the area. Take your mixed grout and apply it over the joints. Wait for about half an hour and clean the excess with a damp cloth.  Then let it dry for 24 hours. 

So there you go, this is basically how you can get rid of the water under your tiles. However, if the damage is too far done, you might have to retile it all together.


Question: How often should you Regrout your shower?

Answer: You don’t really have to regrout quite that often. But if you see any cracks on the grout you can just fill it in. Otherwise, you can grout every 10 to 15 years depending on the quality of grout you used. 

Question: Do you have to seal the grout in shower?

Answer:  Yes, you should always seal the grout in the shower. Otherwise, moisture might seep through and will cause molds and mildews. Moreover, it can also ruin your structure. 

Question: How can you tell if grout is sealed?

Answer: You can check by inspecting the grout. Pour some water on the grout line. After that, if the water stays on the surface, then the grout is sealed. But if the water flows through and the grout darkens, the grout isn’t sealed properly!


There you have it. These are all the reasons for water under floor tiles. We hope that our solution helps you to get rid of the water. And fix up your tiles. If you’re having any issues, reach out to a professional!

Good luck!