Radiant Barriers in the Attic?

disneyjoe7

Let me explain the best I can without pictures....


Foil stapled to the back of the 2x4, 2x6, 2x8, or a 2x10 as space between the back of roofing decking and the foil. I can see this working as "Air" can flow behind the foil keeping it rather cool and keeping attic cool. This I could see it blocking "Radiant heat" and convection heat (I believe anyway). What I can't get my head around is Radiant paint. Since the paint may reduce the "Radiant Heat" the paint itself could be 170f so wouldn't this have convection heat? Then the other can of worms.... How about ceramic aluminum paint could this do both types of heat?

oldmodman

A woman friend recently bought a new house (to her) in Westlake Village in Southern California.
It was a bank repo and she got a really good price on it since it was as-is. $785K
She knew it needed a roof, painting, kitchen, and upgraded windows. The roof was stripped down to the rafters and
a 2" foil backed sheet of hard foam insulation was laid down. But not before all the attic AC ducting was replaced with properly sealed and
sized ducting. And R-28 insulation was put down. Then over the foam sheeting was the plywood sheeting, waterproof membrane and finally the Spanish Tile roofing.
Next were the triple pane windows, insulated entry doors, and blown in insulation in all the exterior walls.
The cooling costs went from appx 650 per month in the 100+ days of the summer to about $115 per month.
She figures it will take about six to seven years to pay for the thermal improvements. Probably less with all the electrical power increases we have had recently.