How to Flood Test your Schluter Kerdi Shower Pan

Schluter shower Shopping List

Why Use the Kerdi system? It is meant as a waterproofing method for showers, rather than a water displacement system. When done correctly your shower should be leak proof and the system is lightweight and easy to install.

• Kerdi shower Kit or Shower Surround
• Kerdi pan (there are many options, of center drain, offset drain etc)
• Kerdi Band
• Kerdi trowel (1/8 x 1/8 for applying thinset)
• Bucket 5 gallon
• Marker These are water resistant so they don’t smear off
• Thinset Schluter recommend their all set modified
• Kerdi drain
• Plug Kerdi drain takes a 2in plug
• timer (you can use your phone)
• Towels (in case water does seep out)

The test (Step by step)

1. Prep, prep, and more prep!

Prepare the Shower for Testing

• Ensure the Schluter Kerdi shower pan is completely installed but not yet tiled with the appropriate thinnest recommended by Schluter (unmodified by other brands or Schluter all set)
  • Make sure Schluter Kerdi band overlaps all seams by 2in,
  • Schluter Kerdi corners are all installed both inside and outside corners
  • Make sure Schluter drain is installed properly
• Clean the area to remove any debris that could interfere with the test. This included dried thinset

2. Plug the Drain

• Use a rubber drain plug or an inflatable test ball to seal the drain.
• If using a test ball, insert it into the drain pipe below the weep holes to prevent false leaks.

3. Fill the Shower Pan with Water

• Using a bucket, or hose, slowly fill the shower base with at least 3in of water, ensuring full coverage.
• Some people like to use a rubber ducky to show that there is water in the pan, but is not necessary
• Use a measuring tape and a maker, mark the water level on the shower wall for reference. This is so you can see if the water level has changed during the test time.

4. Let the water Sit for 24 Hours

• Allow the water to sit overnight or for at least 24 hours, 48hours to really be sure
• Check the water level periodically throughout the day
• If the water level drops significantly, you may have a leak.

5. Inspect the area for Leaks

• Check the surrounding area, including the subfloor and walls, for any water stains or damp spots.
• If you have access to a basement or crawl space, inspect below the shower for leaks.
• Look at the corners especially. Is there water seeping through?
• If you have access to an connecting wall, check the other side of the wall for we drywall or water marks

6. Drain the Water and Check the Drain Seal

• If you don’t find any leaks, remove the drain plug and let the water drain completely.
• Inspect around the drain to ensure no seepage occurs when water flows through.
• Let the shower dry and check for any weird areas, check if there are raised spots, especially in the corners

7. Assess Any Issues Before Proceeding