Measuring The R-value of Reflective Insulation Vs. Fiberglass
FACT #1: R-value is the measurement of a material's ability to stop heat transfer.
FACT #2: The R-values of reflective insulation and mass insulation are based on the same fundamental equation: The ability to stop heat transfer.
FACT #3: Reflective Insulation is a system that reduces the transfer of heat across air space by the use of two surfaces having high thermal reflectance and low emittance (typically metalized film) + an inner substance + trapped airspaces.
FACT #4: The R-value of reflective insulation is the measurement of the system rather than a measurement of just the product. Measuring the R-value of the system (a real-world application) is a truer measurement vs. a measurement of the product only. For example, what good is the posted R-value of fiberglass given that once installed in an environment that includes any moisture it loses R-value? Virtually all real-world environments include some humidity. Unlike fiberglass the R-value of Prodex Total insulation is NOT affected by humidity.
FACT #5: Prodex Total 5M Plus has an *R-value of 17 (one layer) 25 (two layers). Click for real-world test parameters (technical brochure).
0.2" inch (5mm) - Closed cell polyethylene foam covered on both sides with reinforced reflective foil facing.
Prodex Total 5M Insulation - R 17. One solution to Heat, Cold and Condensation - No other insulation protects you from these three conditions like Prodex Total. 5mm (0.2"inch) closed cell polyethylene foam covered on both sides with reinforced foil facing.
New Prodex Total White Insulation - R 15.3. 5mm (0.2" inch) closed cell polyethylene foam with reinforced foil facing on one side and plastic white finish film on the other side.
New Prodex Total 10M - R22. Twice as thick as regular Prodex Total. 10mm (0.4" inch) closed cell polyethylene foam covered on both sides with reinforcecd foil facing.
Any metal building or pole barn that uses fiberglass insulation rather than Prodex Total will have moisture issues (typically hidden behind facing), Loss of R-value (consequence of the moisture) and heat gain.
Updated April 14, 2019