I have been reading about everything I can find on radiant barriers, but still have a few questions and concerns.
I am not talking new construction here, where radiant barrier can be installed under the roof sheeting. I am talking about existing homes, and then, primarily the spray on type.
Here is what I think I understand - -
Sprayed on radiant barrier will cut down 65 to 75 percent of the sun's radiation, - but I really don't know how much cooler that makes the attic.
Sprayed on radiant barrier effectiveness depends primarily on the people who do the work. They can thin out the paint so it is much less effective, they can spray it on to thin as well, and not get the complete underside of the roof. Most homeowners would never know they didn't get a good job. This is a major concern.
Dust on a radiant barrier surface decreases its effectiveness - the more dust, the less effective. Although there generally is not a lot of dust floating around in most attics, it can be stirred up easily. For example, adding more insulation is a dusty procedure, and if there is a previously installed radiant barrier, you will decrease its effectiveness - to some varying extent.
There is a company that advertises radiant barriers for half price (whatever that is) and free added insulation. If they spray their cheap radiant barrier (about which I would have concern about how it was mixed/thinned) and then add the insulation - instant dust.
This company has been advertising for months with some fantastic deal or other and will only quote prices through an in home salesman. I smell high pressure here.
Has anyone used this company? Has anyone used other companies to spray a radiant barrier, and how satisfied are you?
I know I am asking a lot of questions, but I sure don't relish the idea of getting ripped off. Thanks,
Bob-tx