b"ASK THE EXPERTSAsk the Experts Q&As are culled from member inquiries to NTCAs Technical Support staff. To become a member and make use of personal, targeted answers from Technical Support staff to your installation ques-tions, contact Jim Olson at jim@tile-assn.com.QUESTION questionable and unsuitable sub-Imlookingforthespotinthestrates. TCNAHandbookthatstatesthat Robb Roderick, youarenotallowedtousepres- NTCA Technical Trainersure-treatedlumbertobuilda bench or curbs. Is there any wayQUESTIONyou can send that to me or tell meIs there anywhere besides TR711, what page in the book it is? TR712,and TR713thatdiscusses tilingovertile?Ivelookedon ANSWER theTCNAwebsite,whichstates In the TCNA Handbook's show- that procedures are described in ermethodssection,underthedetailinthosestandards.Other requirementsforwoodstuds,thanstatingtheexistinginstalla-itstatestheymustbedryandtion must be sound, well bonded, well braced. The general require- and without structural cracks, there ments for wall bracing are foundarentanyrealdetails.Arethere inANSIA108.11insection4.1differencesbetweenaconcrete WoodFramingrequirements.Itsubstrateandawoodsubfloor? statesallframinglumbershouldDoIhavetodetermineHOW haveamoisturecontentnotinthe previous installation is adhered excessof19%.Mostpressure- andhowmuchitweighs?What treated lumber has moisture con- otherthingsmayIneedtotake tentrangesof30%to70%.Ininto consideration that I wouldnt atileassembly,pressure-treatedotherwise?wood has a tendency to twist and contort as it starts to dry out. TheANSWERrigidity of the tile assembly can- TheTR/not generally handle that type ofRenovation meth-movement,andcanfailfromit.odsintheTCNA Also view page 30, Chapter 2 ofHandbookfor the2018/2019NTCAReferenceCeramic,Glass ManualforinformationaboutandStoneTile 26TileLetter | September 2019"