b'ASK THE EXPERTSsionjointsandTCNAHandbook of all joints in the design drawings Method EJ-171. andspecifi cations.Theircalcula-Requirementsforplacementoftionsforplacementwillinclude the joints, width of the joints andconsiderationforsubstratessub-material used to fi the joints arejecttodefl ection,shrinkage,andll detailedinthestandardsandinexpansion, etc.TCNA EJ-171. It is very importantI strongly encourage you to con-to understand that it is the job oftact the tile manufacturer to ensure the design professional or engineertheir tile is rated for a fl instal- oor to specify the placement and widthlation.SomeGPTPmanufacturers have different types and thicknesses of tile, some of which are recom-mended for wall installations only.Whenusinganycrack-isolation membranesand especially when usingaliquidmembraneitis extremely important for you to: Ensure the membrane is installed exactly as required by the mem-branemanufacturersinstruc-tions.Thisincludespreparation of the substrate, number of coats to be applied, wet fi lm thickness of each coat, cure time, etc. Contact the membrane manufac-turer and request from them the specifi crequirementsfortheir membranetobridgecontrol joints. Ask them for a job specifi c warranty for this installation.Have you attended a GPTP instal-lation course?Mark Heinlein, NTCA Training Director30 TileLetter | April 2020'