Holmes on Homes (2003)

Season 6: Episode 11

Living in a century home, Kjirsten and John had their bathroom remodeled with a custom slate tile shower, featuring built-in bench seating. Soon afterwards, they notice a strange substance leaching out of the tile grout and that the shower doesn’t drain properly. When the bathroom ceiling starts to peel away, they realize something is wrong below the surface. Mike confirms their beautiful looking, new slate shower, is only skin deep- and much more lurks beneath the surface.