Shower Installation Failure
Why Some Tile Installations Fail At Showers
Common Problems:
Tile installed over water-resistant gypsum board (green board) instead of a mortar setting bed or cementitious backer board
Note: The Ceramic Tile Institute has questioned using green board as a tile substrate in wet areas such as tub/shower enclosures.
Edge of green board above tub or shower pan lip is cut edge instead of the wrapped factor edge
Joints and penetrations are not sealed with a coat of ceramic tile mastic prior to tile installation
Insufficient gap (less than 1/4 inch) between the base of green board and the tub or shower pan
Lack of flexible sealant joint at the tile-to-tub or shower pan juncture
Potential Damage:
Water intrusion resulting in:
Tiles popping off
Tile and grout cracking
Dry rot, structural damage, and framing movement
Recommended Solutions:
Install tile over a mortar bed or cementitious backer board such as "Durock", "Wonderboard", or equal, per manufacturer's installation instructions
Provide proper, flexible sealant joints at all fixture penetrations and tie-to-tub and shower pan junctures
Information provided by Building Analysts, a full-service architectural and engineering firm with many years of experience in construction litigation. Their services include: architectural and structural investigations, repair recommendations, preparation of exhibits and expert testimony. Contact Building Analysts Toll Free at: (800) 352-1497.