Sputtering occurs when a metal, most often aluminium, is vaporized and the polyester film is passed through it. Lima International wrote a technical paper on the subject which included statements collected from large roofing manufacturers, and none said that radiant barrier would in any way affect the warranty of the shingles. 13 Attic dust accumulation edit When laying a radiant barrier over the insulation on the attic floor, it is possible for dust to accumulate on the top side. Radiant barriers may or may not exhibit high visual reflectivity. Radiant GUARD® Ultima-foil radiant barrier

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