Will you post pics? TIA
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Ok, I got a call from a company who uses foil type of radiant barrier. She said foil will block 95%+ of the heat whereas the best spray on radiant barrier will block about 77%. She's right. In fact, the government rating doesn't even recognize spray on as a radiant barrier.
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As per the Department of Energy - a true radiant barrier must have the emittance value of .10 or less. None of the paint products meet these criteria and therefore, are not true "radiant barriers".
Product
Emittance
All MAC Radiant Barrier products (solid aluminum) .03
Radiance E025**
.95 to .23**
Lo/Mit-1
.95 to .23**
Lo/Mit-2
.95 to .23
E-Barrier
.95 to .36
Therma-Guard Silver
.95 to .57
Insuladd-RBC
.95 to .59
Formula A Barrier Coat #85
.95 to .66
Formula B Barrier Coat #85
.95 to .70
Koolcoat
.95 to .86
Barrier Coat #233
.95 to .89
Radiosity 3000
.95 to .89
HeatShield R-20
.95 to .90
**The paint product has emittance of .23 to .90 in lab tests only compared to MAC Radiant Barrier at .03. Even the emittance ratings are questionable because latex paint which encapsulates the aluminum flakes has an emittance of .95. So how can any of the paint products have less than .95 emittance?