What are your thoughts on the viability of a radiant floor system over an existing, uninsulated slab. Is it a good idea? Will it be hopelessly inefficient?
Would the following make sense:
Existing slab, 1" EPS foam, 3/4" plywood screwed down, 1/2" aluminum-backed radiant panel, hardwood flooring.
When I say hardwood, I'm only speaking generally... it is very likely that I will go with an engineered product.