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"A single, thin coat of the spray applied to the underside of your roof deck will block up to 80% of the sun's radiant heat from entering your home through the attic."
The paint actually works. What works better is you put in the radiant barrier decking when you reroof. I would only use the spray in kind if I wasn't planning to reroof for a while.
Up to 80% means the paint might block 20% and it might block 30%.
Regular paint blocks some of the radiant heat, but paint is not a true radiant barrier.
Radiant barrier will save 20 to 50% in some cases on your utility bills. gas oil and wood------Put down the aluminum sheeting it lasts the life of the structure.
"A single, thin coat of the spray applied to the underside of your roof deck will block up to 80% of the sun's radiant heat from entering your home through the attic."
"A single, thin coat of the spray applied to the underside of your roof deck will block up to 80% of the sun's radiant heat from entering your home through the attic."
Just my opinion:
I think you are better off spending half of the amount you would pay for the spray-in barrier on conventional fiberglass insulation, sealing your A/C ducts up nice'n'tight and optimizing attic ventilation. I just don't see how your energy savings could possibly be enough to offset the cost of the radiant barrier treatment. I think it makes sense to install the foil barrier when/if you re-roof, but I wouldn't give those efficient attic guys any money. Any roofing contractor can install the foil.
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