Plumbers....adding a shower drain questions

famous bob said

Don't create a long p-trap -----------------keep debris out of it while under construction !

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Where I grew up we had a lot of vacation homes. We would construct large volume traps on all fixtures to prevent dry traps from evaporation. To this day I still incorporate large volume traps on sporadically used fixtures (basement bathrooms, garage sinks, ect). Never had any problems in 25yrs.

In this instance he really only has two choices. Raise the shower, or have a long trap. Regardless of how he plumbs it, it's going to be wet from the crest height to that level in the drain riser.