I am making a shower pan on concrete. The previous owners took out the bath tub and made a shower in its place but didn't use a membrane or anything. Needless to say we have tore it out and are replacing. My question is, since the drain is on one end of the shower how should I slope it without getting that "falling in" feeling? The shower will be 30x60 with the drain on the right not in the center. Any help is appreciated!!

The steepest slope is going to be at the end wall near the drain.
Not really an issue as you don't stand there. The floor needs to slope up at 1/4" per foot of run from the drain.
The goal is to have the top of the mud bed the same level all the way around the perimeter.

It's really no different than standing in a normal bathtub.

RC, am I correct in assuming that a Kerdi drain will probably not work in this situation? I have never tried it before, but I always thought the flange of the drain would be against the wall.

like RC said. take the longest run (drain to furthest wall corner)in feet and multiply by 1/4 inch. Set a level line at that height above the drain all around the perimeter. build your mortar bed to meet that line. so if your furthest corner is 4 feet from the drain you need to set your perimeter line 1 inch above the drain level.

This results in a variable slope with a 1/4 inch/foot minimum.

Kman, a Kerdi drain will work, but you need to do a extra skim coat work on top of the mud bed after to smooth out the transition on the steep side.

Jill would have to bust up the floor around the clamp drain to replace it with a Kerdi drain. If your going to do that, you might as well run it to the center.

thanks for the help everyone! We are hoping to do some mud work today but most likely it will be tomorrow. One more quick question, does it matter how many 2x4's I stack? Right now there are 3 but I'm thinking there should be one more. Also should the lath go down with the preslope or on top of the membrane? i've seen it both ways on the internet but will take your advice above all others. Thanks again!

3 or 4, doesn't really matter unless the final bed height finishes at the bottom of the 3rd 2x4

Are you talking about the lath over the curb?

No not the one over the curb but the one you put one the floor of the pan.

Hi Jill,

If you're doing a standard shower base over concrete the steps are a bit different than over wood. You can bond the pre-slope to the slab with thin set mortar, and so there is no need for lath on the floor. I suppose you are familiar with all the other steps?

I try to only do Kerdi shower these days. Much better then any other method. Go look at some pics of a Kerdi shower. The one over a slab shows the deck mud being bonded to the slab as you should. http://picasaweb.google.com/tile4youinc Also study the "Shower deck old method" sketch. That is how yours should be.

Jaz

Hi Jaz thanks for the advice! One more question, hopefully, do i need to let the thin set dry before I start the pre-slope or can I just do it in one step?

Thanks again to everyone for all your help!!