b'TECHNICAL thinsetoranapprovedadhesive.determine whether or not a system A hybrid system is a liquid-appliedor material is actually waterproof. membrane at corners and seams toOthercontractorsprefertheease create the waterproof overlap. of liquid-applied membranes over a seam. Still others dont like the potentialbuild-upofoverlapping membranes.Trust the methods and manufacturersThat said, one of the most valu-ableresourceswehaveavailable to us in the tile industry are ANSI standardsandTCNAmethods. When we use materials that meet ANSIA118.10wecantrustthey willperformasawaterproofsys-tem. This being the case, we can and should trust the manufacturers whentheirmaterialsareinstalled correctly.AndintheTCNA Handbook, we find this language regarding installation of waterproof membranes:Bondedwaterproof membranemustbecontinuous, includingatchangesinplane. Followmembranemanufacturers requirements for corners, seaming, and overlap. Emphasis is mine.Lets take a closer look and see Hybrid seam installation. Photo courtesywhat challenges and risks tile con-of Bryan Cook. tractorstakewhentheybuilda hybrid shower system.SomecontractorswhousethisYou dont know what you method do so simply because theydont knowdont trust the science behind thin- The first potential issue tile con-set bonding a 2 overlap to main- tractorsshouldbeawareofis tain a waterproof seal. The internetintroducingtechnicalunknowns isrepletewithvideosofcontrac- into the system. Potential material tors conducting their own tests toincompatibilitiesmayarisewhen 100TileLetter | August 2020'