Hi guys - gutted my sons shower down to firing strips & block wall, other two walls metal studs - the grout had failed, wall board total mush. Removed the tile on the floor & cement threshold.<br /><br />I was going to go back w/ cement boord & 24 X 24 tiles w/ a TTL redo. Is there a recomended sealer / film I should be installing under the tiles right down from the walls to the floor pan?