Doug French
I usually rough my drains in at 18. But you have to be careful with the dreaded pedestal basin. They are not bad if the back of the pedestal is fully open from floor to basin…..but I have seen too many that only have an opening from the basin to halfway down the pedestal. If you have the pedestal basin, the p-trap and a tape-measure, you could figure out the optimum rough-in height, leaving at least one inch of room on all sides of the trap, and allowing for the pop-up drain mechanism…..Lou
