I am in the process of having my shower tiled and would like to know if it's being done correctly. I don't mean to second guess the tile contractor but I thought all the seams are supposed to be sealed. I've even seen it where the Durock is completely covered in the Redgard waterproofing material but mine is not. He did aplly it to the lower half of the shower, the floor and bench. The contractor will not be back until Monday and I want to make sure it's being done correctly before he finishes. I appreciate all of your advice. Thank you.