Post by Christopher on Feb 25, 2011 14:33:35 GMT -6
I would highly recommend putting some type of membrane on top of your slab. Having the system directly on a slab does indeed cause a lot of heat to get lost right down into the earth.
The underlayments you will want to use are generally under 1/2", and some are even 1/8", meaning the small amount of ceiling height you'll lose is well worth the extra heat you'll keep in your floor rather than the earth.
There are quite a lot of products out there to use; here are some examples.
Old thread, I know... but I came to this page by doing some google research and it,s exactly the situation I'm in.
Live in Canada, Quebec, zone 5. We had floods this year (never happened where I live in over 60 years, I'm told). Used to have hardwood flooring, and removing it due to flooding is not something I want to live through again.
I have an uninsulated slab in the basement. My idea was to put radiant wires (electricity is cheap here), cover it with self-levelling concrete, then add a layer of Epoxy for the look and durability. Now, from the question above, I understand the need to "isolate" the wires from the existing slab with some kind of membrane. My concern with that is if there is ever another flood, wouldn't the water "seep" between the slab and the membrane ? If so, I would need to remove it to dry, which is as worse as what I lived through with the hardwood...