Just coming up to doing this one now, 3fall, you mention about overlapping the joints, they sell some tape for the joints, is this not really needed? They also sell internal and external corners, would they not be needed either? I know you said you've never used it, so maybe you can't help!
Thanks
I haven't used their system in a little while Magga,
Trying to recall, I'm sure on walls you were instructed to overlap 50 mm
But if they have a tape, then I would say from a 'covering your own backside' point of view, use the tape for the joints.
But I struggle to see the difference between overlapping and jointing.
They are both a cloth of equal thickness after all.
Preformed corners are only really a convenience thing. You can make them out of the tape.
As with Schluter, you can buy preformed or not.
I suppose with the preformed there's more of a belt and braces cos they're seemless, where as when you make your own, the overlap is a weak point.
But no, preformed corners are not a requirement from memory.
Maybe not much help, but that's the way I'd see it.
Hope this has been a little help.
Did find this, very basic PDF on installation.
http://homelux.co.uk/downloads/Waterproof Matting_Leaflet.pdf