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Anybody have any experience with radiant barrier insulation (used in lieu of styrofoam board) under a radiant slab? It’s two sheets of reflective foil “sandwitching” a poly-foam core. It’s about 1/4″ in cross-section. The manufacturer claims it’s more efficient, easier to install, cheaper and also serves as a vapor barrier. They also claim that “reflectivity” – not “R” factor is what’s important under a slab. All this sounds real good, but what about the real world?
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Anybody have any experience with radiant barrier insulation (used in lieu of styrofoam board) under a radiant slab? It's two sheets of reflective foil "sandwitching" a poly-foam core. It's about 1/4" in cross-section. The manufacturer claims it's more efficient, easier to install, cheaper and also serves as a vapor barrier. They also claim that "reflectivity" - not "R" factor is what's important under a slab. All this sounds real good, but what about the real world?