The R-value Of Reflective Insulation And Mass Insulation Is Based On The Same Fundamental Equation - The Ability To Stop Heat Transfer.
- R-value of reflective insulation - How is it measured?
- Definition of reflective insulation
- History of Reflective Insulation
- Video of how Prodex Reflective Insulation works
- Parameters used by other insulation types to test R-value
- Inaccuracy of R-value of cellulose and fiberglass insulation
- Uses - Applications for reflective insulation
- Five Reasons to Buy Prodex Total Reflective Insulation
The R-value of A Reflective Insulation
The R-value of reflective insulation and mass insulations is based on the same fundamental equation: The ability to stop heat transfer. The R-value of reflective insulation is measured as a system. The best system consist of two reflective surfaces surrounding an inner substance (core) plus two trapped airspaces. If you know the system measured (parameters of test), the R-value you're using is accurate.
Fact vs. Fiction
Fact: The R-value of a reflective insulation system is accurate.
Fiction: The printed R-value on fiberglass and cellulose insulation (Proof that their printed R-value is fiction is just a few paragraphs away).
The R-value of reflective insulation is measured as a system rather than just the product. It's a better form of measurement when you think about it. What good is an R-value of a product if when it's applied in your application it has a different value. You need to know the answer to a question like - What will be the R-value when installed in my roof for example.
- Reflective insulation R-value is measured as a system.
- It has a center (core substance).
Example - Prodex Total Reflective insulation has an R-value of 16.
13/64 inch (approx. 3/16") - 5mm closed cell polyethylene foam covered on both sides with .0012 inch (0.03mm) aluminum foil facing.
The R-value was measured under the following parameters:
24-inch on center 2" x 6" wood assembly. Roof application. Test Method ASTM 1116. Airspace of 2.64 inch on each side of product. Heat flow direction down.
Best Definition of Reflective Insulation
An insulation 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 or aluminum) + plus an inner substance (mass insulation) + plus trapped airspaces.
Most definitions, even those on .org websites fail to mention the inner substance (mass insulation) that is in between the two reflective surface layers. This is the cause of much of the confusion. Without the inner substance, (foam, fiberglass, wool or Mylar bubbles) it is not reflective insulation - it is only a radiant barrier.
This bears repeating " Without the inner substance, (foam, fiberglass, wool or Mylar bubbles) it is not reflective insulation - it is only a radiant barrier.
History of Reflective Insulation
Reflective insulation is a commercial spinoff of the NASA Apollo Space Program. NASA used a reflective foil covering to create a radiant barrier for both the spacecraft and space suits to reflect the intense heat of the suns away from the astronauts by day and to reflect internal heat back inside the capsule of space suit at night for warmth. NASA estimates that "Using conventional insulation, a space suit would have required a 7-foot-thick protective layer." Prodex improved on this technology to consumers for all types of building applications.
Today, reflective insulation has become a standard component of a total insulation system. It's designed for both new construction and retrofits. Using reflective insulation for either your house or metal building will increase the comfort level inside, protect against condensation and save on energy costs.