Shower Installation Failure
Why Some Tile Installations Fail At Showers
- 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.
- Water intrusion resulting in:
- Tiles popping off,
- Tile and grout cracking,
- Dry rot, structural damage, and framing movement.
- 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.