Coved Corian shower is greenboard enough?
We want to redo our shower with seamless Corian. The contractor we are thinking of using says he uses greenboard because the seamless Corian is waterproof (I don't know why he doesn't want to use cement board..maybe pride??). Our city planning department says that cement board is required, but they are willing to take a letter from Corian saying that Corian recommends green board. We called Corian to ask where we can find their recommendation, it has been a few days and they haven't gotten back to us. I was wondering what professionals think? We are thinking we'd like cement board. Even if the coved corian is waterproof, there are water faucets too. I was wondering what others think? Thanks!