Is there a maximum distance from the shower floor to the P trap
bottom that is specified by code? The local building inspectors advised me that maximum drop was 8 inches; another inspector there was no maximum particularly for traps beneath the first floor, although you shouldn't exceed 24 inches. This is very frustrating. Apparently there is concern that the P trap could wash out if water falls to far through a long vertical drain. Any input would be appreciated. Thanks.