How necesary is it to use something like Ditra on a 30 year old basement floor?

I’m planning an ~550sqft tile floor in the family room of my Pretty Good House remodel project.  The basement floor was poured sometime between 1980 and 2000, has one small… I’m planning an ~550sqft tile floor in the family room of my Pretty Good House remodel project.  The basement floor was poured sometime between 1980 and 2000, has one small…Read MoreGreenBuildingAdvisor