Radiant floor heating

[Darryl Branton]

Good day, all.  Would anyone know if it is possible to add trace lines in flooring conditions?

I have a zero threshold sliding door track that was condensating quite badly, and though I was able to correct this (I will probably ask for a peer review for anyone willing) I still feel the floor will be too cold for comfort,and the contractor has offered to add in floor heating between the Ditra Mat.  Given the location, I don't see how I could simply leave an opening in the detail for interior air as I have done in the past, I have to somehow model these areas as 70-degree zones...  Is there a way?