Quote:
Originally Posted by Mikesolar
Radiant barriers are ONLY useful if there is an airspace of at least 3/4" between the barrier and the heat emitter (concrete floor or anything else). Otherwise it is a conductor.
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If the fiberglass insulation he's installing is directly under the floor {and the water loop} and the radiant barrier is not crushing the fiberglass up to the floor when installed, I am of the opinion that there would be adequate airspace. I believe it could be of some benefit in this instance. However, I can't say it as a fact because I've not done it myself.