Radiant Barrier Paint

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With the rise in popularity of radiant barrier insulation, there has been an influx of reflective spray paints marketed under the term radiant barrier paint that are designed to be sprayed on the underside of the roof decking in the attic.  These so called radiant barrier spray paints are merely paint solutions with added metallic flakes designed to reflect heat and are NOT true radiant barriers per the radiant barrier definition set forth by the American Society of Testing and Materials International (ASTM) which governs the testing standards of building materials.  

ASTM Radiant Barrier Definition : a product must have a low emittance of 10% or less and high reflectance of 90% or more to be classified as a "radiant barrier."

Our RadiantGUARD® Ultima-foil radiant barrier insulation products have an emittance of 3% and a reflectance of 97%;  far exceeding the ASTM's radiant barrier minimum classification requirements.

More accurately, such reflective spray paints are classified as Interior Radiant Control Coatings IF they are tested by ASTM C1321 "Standard Practice for Installation and Use of Interior Radiation Control Coating Systems in Building Systems" and pass the minimum reflectance of 75%.

In 2006, David W. Yarbrough, Phd, PE conducted testing of the reflectivity properties of leading reflective paints.  He found that the reflectivity of these reflective paints varies widely.  In fact, ONLY FOUR of the products tested actually passed the ASTM minimum requirements to even be classified as an IRCC intended to reduce heat trasfer, yet alone the requirements or a radiant barrier.

Details of the findings can be found in Dr. Yarbrough's heat reflective paint study.

Product Manufacturer/Distributor Reflectivity Radiant Barrier Paint? IRCC?
Radiannce E025 Chemrex 77%


Formula A Barrier Coat #85 Hy-Tech 34% NO
Formula B Barrier Coat #85 30% NO
Barrier Coat #233 11% NO
HeatShield R-20 Kwik Co. 10% NO
Koolcoat Pawnee Specialties 14% NO
Radiosity 3000 Green Building Supply 11% NO
E-Barrier Sherwin Williams 64% NO
Heat Bloc 75 STS Coatings, Inc. 78% NO YES
HeatBlock-Ultra 80.5% NO YES
Lo/Mit-1 Solec-Solar Energy Corp 77% NO YES
Lo/Mit-2 77% NO YES
Lo/Mit-II Max 85.3% NO YES
Insuladd-RBC Tech Traders 41% NO
Insuladd-White 10% NO
Insuladd-White on RBC 14% NO
Therma-Guard White United Community Services of America 14% NO
Therma-Guard Silver 43% NO
Therma-Guard White on Silver 15% NO


Our RadiantGUARD® Ultima-foil radiant barrier reflects 97% of the radiant heat making them FAR SUPERIOR to any heat reflective paint.

While installation costs of radiant barriers and reflective spray paints equate to about the same, RadiantGUARD radiant barriers provide a quicker ROI (return-on-investment) because they block much more heat than the spray paints.

Additionally, reflective spray paints require more installation equipment (professional paint sprayer, protective clothing, and face masks making it a more difficult task for the average do-it-yourself (DIY) individual whereas, our RadiantGUARD radiant barrier and reflective insulation products are extremely easy to install requiring less installation tools and effort which results in a quicker ROI.

View and purchase our radiant barrier insulation.