the drain as shown in the picture below? Also does this method call for a paint-on membrane to be put on the very top? Let me know and thanks again for your time. ANSWER Either a liner on the pre-slope or a surface-applied membrane must be used. Not both. Whichever one is used, it must be prop- erly sealed to the clamping ring drain. The divot allows for using a surface-applied membrane in lieu of a pre-slope and a liner with a clamping-ring drain system. Or, a bonding-flange drain system can be utilized to accommodate a surface-applied membrane. There are many variables, tech- niques, best practices and stan- dards that must be considered, applied and performed correctly in every tile installation. Showers and wet areas are especially criti- cal. I suggest contacting a quali- fied, certified, knowledgeable, experienced professional using the links I sent previously. – M.H. RESPONSE Mark, thank you. I did the liner on the pre-slope so I should be okay. I just wasn’t sure why the base retained so much moisture even with the liner, slope, and weep holes all in working order. ANSWER Drainage issues could poten- tially be related to the site mix/ recipe or consistency of the mix, method of application, etc. Perhaps the problem with the grout could be related to the type and mixing and application of grout or the type and mixing of the mortar and troweling tech- nique used to bond the tile to the mud pack. – M.H. ASK THE EXPERTS –––––––––––––––––––––––––––––––––––––––––––––––––––– e-Learning Program Industry and product information in short, easy segments Train from the comfort of your home or office anytime Fast and easy to access, listen, and complete A-8333-0917 ©2017 LATICRETE International, Inc. All trademarks shown are the intellectual properties of their respective owners. For more information, visit www.laticrete.com/university 1.800.243.4788 Globally Proven Construction Solutions Globally Proven Construction Solutions 24 TileLetter | October 2017