JJ wrote:

My shower stall has a 2" pipe for the drain, running into a 2" trap,
etc. It's 2" all the way. Anyway, I need to shorten the straight
piece running into the trap. The trap was set in a little low to the
ceiling below. I want to be able to give it a little more room. What
should be the minimum distance from the shower drain to the trap
below? I know gravity does the work, but I want to make sure the drop
is sufficient for the water to run.

Thanks,

John


The "drop" can be anything you want.
What matters is that the horizontal pipe
from the trap have some pitch to it:
about 1/4" per foot will do it.
I don't see any problem with what you plan.

Jim