Concrete dowelling w/thermal break

[Nozmo50]

Is a non-metallic or coated metal dowell available that would allow dowelling of floor slabs but still provide a thermal break for heating ??

 

[AlohaBob]

There are products such as fiberglass or epoxy coated rebar.

I question the need for the thermal break concern in the connection. When the heat loss analysis is done, all things are taken in consideration. I doubt the attention to the dowel connection will give you significant improvement.

I would consider adding a few more inches of insulation to walls and ceilings.