I am going to be installing tile over durock cement board which sits on the top edge of my shower pan and just slightly over hangs into shower pan. Should I rest the starter row of tiles down on the cultured marble shower pan which has a 1/2 in lip or should I leave maybe 1/8 gap and if so what do you think I should use to fill in that gap where tile meets shower pan.

I am going to be installing tile over durock cement board which sits on the top edge of my shower pan and just slightly over hangs into shower pan. Should i rest the starter row of tiles down on the cultured marble shower pan which has a 1/2 in lip or should I leave maybe 1/8 gap and if so what do you think I should use to fill in that gap where tile meets shower pan.
I'm not a tile man. They come in after we plumb in the shower. However let me give you a site that instructs you on building a tile shower stall. Click on , http://www.compotite.com/blue_inst_eng.htm
Good luck. Tom

No matter what you do you need to waterproof the durrock. It's a good backer but it isn't waterproof. Check out the Schluter Systems Kerdi material as I found it was a lot easier to use than traditional thick pan liner materials.

http://www.schluter.com/english/articles/showersystem.htm

Trick stuff for sure. No more thick mortar beds. Was real easy to use this stuff. Almost like hanging wall paper!