Hi all not had alot on today and been having a good nosey around the forum at some work (very impressed) was wondering when you build stud work, partitions, shelves, walk in shower curves ect, How do you size the wall ect for tiles to fit do you have a set size i.e thickness so that you know a tile, mosiac, bead will fit or do you make sure you have the tiles first so you know how thick to build them hope this makes sense.