From: "Craig M" 
Newsgroups: alt.home.repair misc.consumers.house alt.building.construction
Subject: Re: Source for plywood roof sheathing with radiant barrier in SF Bay Area?
Date: Sat, 11 Aug 2007 10:34:41 GMT
Bytes: 4874

I am repeating a lot of what I have heard from a local home inprovment show
down in the houston area, but the guy is heard all over the state, google
Tom Tynan, and see what you can find, but what the barrier does is reflect
the sun radaiant heat back, it realy dont reflect that much back into the
attic, just keeps it from getting so hot, we put that bubble type stuff up
in my folks house, and where it was as compared to where it was not, you can
feel a difference, best way to figure out where to put it, is too look at
where the sun hits the house, mostly on the south side, as that tends to
collect most sunshine.
Hope this helps
 wrote in message
news:1186617705.596231.131570@k79g2000hse.googlegroups.com...
> On Jul 31, 5:53 am, "Craig M"  wrote:
> > What I know about it, its a spray on, like paint, can be spryed with
airless
> > equipment, as to uniform, depends on how well you can spray, like paint,
> > down here in texas some insulators are also into spraying it, I want to
say
> > I have heard that Sherwin Williams stores have the paint, or check with
the
> > Florida Solar Energy Center, may can get more info from there.
> > Hope this helps"Dennis"  wrote in message
> >
> > news:V5uri.3010$6f4.61@trndny01...
> >
> >
> >
> > > Hi Craig.
> >
> > > I'm not failure with a spray-onradiantbarrier, do you know anything
> > about
> > > it?
> > > Wonder as to how uniform it would be?
> >
> > >  M"  wrote in message
> > >news:wp1ri.29946$2v1.12402@newssvr14.news.prodigy.net...
> > > > One way I have seen it done is to have theradiantbarriersprayed in
> > the
> > > > attic, that is done a lot in retrofit, and seems to work pretty
well,
> > the
> > > > plywood is still the way to go in new const though.- Hide quoted
text -
> >
> > - Show quoted text -
>
> All, spray on paints are, by definition of several sources, are "not"
> radiant barriers.  They are actually Interior Radiation Control
> Coatings (IRCCs).  A radiant barrier has to have a minimum of 10%
> emissivity and 90% or more reflectivity (California Title 24 code is
> even more stringent).  There are several manufacturers of the
> reflective paints, all with different reflectivities.  A foil is a
> "known quantitiy" by virture that the inherent properties of aluminum
> foil have a 3% emissivity and 97% reflectivity.  Paints are almost
> always applied by a contractor just because most people do not want to
> rent a spray applicator , deal with the mixing of the paint, etc.,
> etc.  Whereas, foils can be applied by different methodologies.
> Another consideration about paints is that if the decking ever has to
> be replaced due to damage, the paint goes away as well.
>
> Regarding the San Francisco situation, concur that if you can't find
> the OSB or plywood decking with the foil already adhered to it, there
> are foils and other foil products that can used as underlayment.
>
> I have a list of links to several unbiased, government and university
> technical sources on my website:  www.reflectafoam.com/technical.html.
> If anybody needs further info or specific information, don't hesitate
> to contact me.
>
> Thanks, Donnie.
>