In some sauna applications, slatted wood floors are built with a hinge so they can be flipped up. This allows moisture to drain quickly and access for cleaning the area beneath the slats. I have a teak mat in my shower and it's nearly 10 years old, no splitting or cracking, just some hard water deposits that come off easily with a soak in white vinegar and a teaspoon of baking soda -- add the baking soda after the mat is in a tub with the vinegar. Done in 30 seconds, no long soaking or scrubbing.