Just wondering what height to cut clear - Tile + How much for adhesive? The tiles are 59cm x 59cm porcelain and 9-12mm thick. I have a 20mm trowel. I think that is 15mm height so applied at an angle presumably will be somewhere between 9 and 12mm (depending on angle)... is there an official way to work this out? The house is not that old so door frames are an MDF style material and should be easy enough to cut away.