I have been using Kerdi Board for a long time and have noticed that mold grows on it if it is left outside in the rain and elements. But I wanted to prove it in a test so I put a sample in a bucket underwater for over a year. Watch the video for the results.

The Scientific Method:
1.) Make an observation: I tore out a Kerdi shower in Jan. 2023 and saw that the kerdi board was falling apart.
2.) Ask a question: Will Kerdi Board fall apart when it is submerged in water for prolonged periods of time?
3.) Form a hypothesis: I believe if Kerdi Board is submerged in a bucket for a year it will start to fall apart in layers.
4.) Test the prediction: See video.
5.) Iterate and use the results to make a new hypothesis or predictions: Use the same testing method on other brands of wall board to see if they have the same problem or if this is unique to Kerdi Board.

If you need help on your DIY shower project, I offer 1 on 1 tile coaching consultations. We use zoom or Facetime so I can see your project and offer you good advise on what methods and products are best suited for your job.
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Here is the video link for the video in Arroyo Grande:
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Here is the video on the Kerdi Board vs Hydroban Board testing:
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