i use a mixture of tanking products...
1. mira fibreglass mat (1mtr wide 1mm thick)
2. mira fibreglass tape (100mm wide 1mm thick)
3. mapei gum (fleable paint on tanking)
i find that in this case the mapei mesh is not as good as the mira but mapei gum is far better than miras tanking paint....
remenber guys when you tank a room it must be of solid construction..
wedi trays are the best but must be secure,
also always fibreglass the floor first ensuring to come at least 150mm up the walls.... then you apply your corner tape over the floor fold,
take care and perticular attention to pigeon holes,ledges etc.
if you would like to see a photographic reconstruction of a wetroom visit my website
www.protilers.com and click on projects then goto Denbigh Gdns 2.
i think this will illustrate the point perfectly.......
however this is the way our company does this without failure (100+ wetrooms)
it does not mean that there are not different ways of doing it....its just tried and tested...... good luck!
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oh i forgot to mention.....all of the products i listed are available from trimline (and many more) plus for a nominal fee they will deliver them to site thier number is
0208778 9000