Pool coping is the material above the tile line that generally covers the top of the pool structure.This part of the pool is normally 12" wide. The pool coping is used to separate the pool structure from the pool decking. coping also serves as a frame around the pool. Much like a frame around a picture or painting. Coping comes in many different materials such as poured concrete, brick, flagstone, pre-cast concrete, travertine or tile.