I am installing heavy terrazzo tiles (size 400mm x400mm, and 20mm thick) onto lower part of bathroom wall up to height of 1200mm and also on the bathroom floor. They weigh 48kg/m2!. I am using the approriate backer boards on the floor and wall. But I am unsure as to the best adhesive to use. Thinking about Keraquick and latex plus from Mapei but i have had conflicting advice and, as a beginner, I don’t want to take any risks with these heavy tiles. Any advice welcome! Thanks.