About to tile the bathroom floor, am I missing anything?

Hey, This is my first gut and replace of a bathroom, so I just wanted to run it by all of you.

5 1/2' x 8' Bathroom (pic)
http://www.tamogila.com/images/renov...m/P1010127.jpg

Big old 2"x8"'s 16" OC - 14' partially supported span (there is a wall that runs directly under the bathroom, and it looks pretty heavy duty but I don't know if is't really supporting the joists). Two of the joists need repair. (pic) http://www.tamogila.com/images/renov...m/P1010121.jpg

I have all of the plumbing removed and have ripped up the failing 3/4" T&G and am ready to start laying the subfloor. These are the steps I want to take:

1. Lay down 3/4" Ext Ply - screwed to the joists.
2. Thinset
3. 1/4" cement board - screwed to Ply, but not joists.
--> Get plumber to rough in plumbing
4. Thinset
5. Tile
6. Grout

Please let me know if I'm on the right track, and let me know if I missed something.

Thanks!

 

You should be fine, as long as that wall below is supporting or helping support those joists, I like more plywood, but 3/4" over 16" spaced joists meets specs, but that's the minimum.

 

Thanks!

Would you recomend 1", or 2 layers of 1/2"? Or something else altogether?

 

3/4", then 1/2" plywood is ideal, then 1/4" backerboard.

I usually mud all my bathroom jobs if the height isn't a problem, mud can go over 1 layer of whatever is there, usually.

 

Could you elaborate on this process? I tried to do some research, but everyone that mentions mudding assumes the reader already knows what they're talking about. Right now I'm down to the joists, so I'm starting with no layers of anything. Thanks again for all of you're help!

 

A mud job is 1 1/4" minimum thickness of 1 part portland cement to 4 parts mason sand, mixed with water till it just holds together in a ball, then it placed and packed over tar paper and wire lath and leveled, this is all over 3/4" subfloor, sheet or plank flooring.

 

What about using self leveling thinset or cement? Would that work the same?

 

Depending on the substrate, a self leveling compound can be used, but more expensive, never heard of self leveling thinset.