Hi all,

I am currently building a custom shower, and have been following the
directions from a DIY book, and getting useful information off the web.
For the most part, the instructions from all sources are consistent:
1. Layer of mortar sloped to the drain
2. Felt paper over mortar to protect membrane
3. Membrane, with proper seal around drain assembly
4. Backerboard on walls, down over membrane, but 1 1/2 inches off the
pan floor
5. 2 - 2 1/2 inches of mortar with pea gravel around weep holes to
prevent cement from getting in the holes

What I haven't seen explained is what happens to the inside of the
threshold to prepare it for tile? Should a narrow strip of backboard be
screwed to the inside of the threshold (but kept 1 1/2 inches off the
floor), and mortar over the top like the other interior walls? It
seems like screwing the backerboard on the inside of the threshold
would compromise the membrane? I've seen a few pictures of the steps
involved, and it seems that everytime they get to the final bed of
mortar, the threshold and inside of the threshold appear to be exposed
membrane. Can you simply tile over the membrane???

Any help would be greatly appreciated!

Thanks and Best Regards,
Todd