shower boards

Hi, this is my first post and apologies if I've put it in the wrong forum I bought my house a few months ago and have had a growing list of unforseen repairs to deal with. The latest is the upstairs shower room. Having removed two horizontal plastic strips from the wall above the tray...

Good afternoon, After watching bunch of youtube videos I have decided to use Kerdi boards for my shower. One thing I don't understand is that they refer in those videos to unmodified thinset mortar and modified thinset mortar. After reading few previous treads it seems that modified mortar is S2...