Schluter-Ditra XL 5/16 Underlayment 175sqft Roll by Schluter

The XL was great option to the standard 1/8” ditra.

Easy install for 2nd floor condo.

Make very very certain that you lay it down very very flat and never fold it. Once you have a crease you are done for. Your floor will not be flat amd then tiling will be a pain