Yeah, my duck house never really gets soaked since the water is outside, but it just seems it never dries out 100% either, always damp. I feel like the straw bedding traps some moisture too.
I used wood on my duck house floor. It's had ducks living in it about a year. All food and water is kept out of the house and I live in a dry climate. Despite this, it routinely gets wet/damp and I wish I had covered the floor with something more water proof, vinyl peel and stick tiles or...