This is when you are installing tiles over existing cement patio. Idk if it's a board, it seemed bendable. I saw it on HGtv And I can't remember what it's called
It's called Hardyboard. Used it to tile an entryway; good stuff. If you are going over existing cement, you don't need it. Fill any cracks you might have, sweep it good, and then just trowel on the mastic and set your tiles.
Made by Schluter tile systems and I believe what your referring to Ditra, Flexible orange mat. Any questions you can e mail me through my avatar and check my qualifications there, GK
