I finished my plumbing - an addition of a shower drain to a half bath rough in- and poured my concrete today. But I didn't like the idea of leaving 6" of a hole around the new drain pipe for drain assembly though. I foresee(maybe incorrectly) that that type of a gap could cause cracking of the pan eventually since there is no support. So, now I have my 2" stub sticking up 10" or so out of a level concrete floor. Was I wrong? Did I screw up? How can I attach a drain properly given what I'm looking at? I was planning to put some type of foundation mix or plaster into my shower opening before I set my pan(per instruction) Will this give me ths space I need>?

Any help is appreciated.

Can you further explain how you did your trap for the shower? Sounds like you are installing a prefab shower pan, can you tell us the brand/model? You may be OK

Looks like you will have to chip out around the pipe now to allow for the drain. It is little bit of more work for you...