Radiant floor heat in a garage question

[jkwilson]

Went to see a new home the other day. The garage has radiant floor heating, which seems nice.

The question I have is that it was poured like a conventional garage floor with the concrete extending under the doors to the outside of the finished exterior wall. Seems to me this would be a source of heat loss with part of the heated slab being outdoors. I expected some kind of thermal break at the doors.

 

[koditten]

Yep, big waster of heat. If I bought the place, I would be seeing in a thermal break.

 

[mortten]

If done properly there should be foam board insulation under the slab. On the sides the insulation should also be along the block wall and cut on a 45 degree angle so the top of the concrete covers the insulation up. Can't think of how you could tell it was in there.