Copper doesn't remain the first choice for radiant floor tubing anymore. Cost and some corrosion possibilities have made PEX tubing favorite. So many soldier joints unless one used soft copper. Copper plates would require same amount of contact with piping as Alum/pex I would think. For tile top surface a rough coat would be needed to cover tubing and let dry before tiling should be done if tubing not imbedded in subfloor channels.
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