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Reflectix is a double-sided reflective foil bubble wrap used as a radiant barrier, not a fiberglass batt. Its R-value depends on the air space it faces: about R-3.7 when installed tight, up to R-21 with a large sealed air gap. It is thin, light and easy to cut, so it suits attics, garage doors, rim joists and duct wraps where bulk insulation won't fit. Against glass wool batts it blocks radiant heat well but carries little conductive R-value on its own, so reviewers treat it as a supplement rather than a replacement.
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Lowest price we've seen: $36.99 on Nov 11 at Ace Hardware. Tracked across 1 store since Nov 11.
Owners use it mostly for attics, garage doors and duct wraps and report a noticeable drop in heat gain. Many note the R-value depends entirely on leaving an air space, and some find the foil dents or tears while installing.
This Reflectix reflective radiant barrier insulation comes as a roll that is 24 inches wide and 25 feet long. It covers 50 square feet and is 0.3125 inches thick.
It is rated from R-3.7 to R-21. It is intended for use in floors and walls.
