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Discussion Starter #1
I'm renovating a master bedroom and planning on a 4 foot wide by 8 foot deep shower with a 4 foot linear drain at front. Slope is going to be up from front to back 1/4 inch per 12 for total of 2 inch rise from front to back.

What is the recommended/required buildup from the subfloor to achieve a zero curb entry to the shower?

I want the shower entrance to be the same height as the floor outside the shower, with a gradual rise as you enter the shower.

My subfloor is 2x8's set on a diagonal pattern (home built in 1960). The floor joists are 2x10s. There is a finished basement below this room.

Here's a pic of the shower area:

 

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Discussion Starter #2
Update: I spoke to one of our building safety inspectors today. He informed me that the requirement is that the subfloor under the shower pan be sloped. There is no requirement that the slope be done with a mortar bed. It can be subfloor plywood as long as the slope is maintained 1/4 drop per 12 inches.
 
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