Flanges Are Required on All Tubs Used for Shower Receptors

CTIOA Technical Committee Technical Bulletin No. TB002 Revision 0 September 26, 2006 Technical Bulletin Scale: None Page 1 of 1

Flanges are required on all tubs used for shower receptors

After years of repetitive forensic investigation, by Ceramic Tile Institute of America Technical Committee’s experts, there is little doubt that any tub used for a shower receptor must incorporate an integral 1-inch high continuous flange in order to properly shingle/weather lap the wall or seat membranes to the tub fixture. These experts, involved with construction defect litigation, have documented overwhelming evidence of moisture damage and microbial issues resulting from the lack of properly lapped membranes due to the use of non-flanged tubs, including cast iron and self- rimming tubs, as shower receptors. Due to installation errors documented during field investigations, the use of flange kits provided by the Manufacturer, for adding a flange to tubs manufactured without an integral flange, is not recommended except when installed, tested and warranted by the original tub Manufacturer and meets the requirements listed in this Position Paper.

Therefore, the CTIOA Technical Committee recommends any tub used in combination with a shower head must incorporate an integral, 1-inch high, continuous flange to allow the proper over- lapping of the wall and seat/bench membranes.