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 ANSWERSCanyoupleasetellmewhereThereisnotanANSIspecifi -tolocateinthe2019TCNAcationoraTCNAHandbookHandbookinformationtodeter- method or detail for installing tile mineifinstallingtileoversheetover sheet vinyl goods. The NTCA vinyl goods is still a questionableReference Manual lists sheet vinyl substrate? I do not see any ANSIas a questionable substrate. specs that reference installing tileHowever,manymanufacturers over glue-down sheet vinyl as anproduce mortars that may be used option. Is there a spec for this? to install tile over sheet vinyl pro-vided it is fully adhered (not simply edgeglued)andnon-cushioned. Should you choose to do this, it is critical to follow the mortar manu-facturer's instructions.Itisvitalthatthatyouusean appropriate cleaner to remove all 30 TileLetter | January 2020"