A defect that is commonly found in houses is drummy tiles. The term ‘drummy’ refers to tiles that have become detached from their fixing, despite otherwise being in relatively good condition. Such defects are generally caused by physical or moisture damage to the area but may also be a direct result of poor workmanship during the construction process. Tiled areas may swell and shrink with changes in air humidity if the area has sustained moisture damage. Any exposure to moisture is capable of causing tiled areas to become drummy and/or cracked over a prolonged period of time.