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radiant age

Hi all,
I am currently checking homes for sale via internet in Santa Fe area. They are all on slab naturally. Many have radiant which is great but were built in the late 70's. I can't seem to recall when the newer tubing systems came into use. The materials that addressed the air issues etc, that were the scourge of the industry for many years. I am assuming of course that they are plastic and not copper.

Should I ever get out to physically visit these homes is there a way I can tell what kind of plastic was used if it in fact is? I am guessing it has to be marked every few feet.


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