On 7/9/2007 9:06 PM, Stewart Stremler wrote:
begin quoting Andrew Lentvorski as of Mon, Jul 09, 2007 at 07:40:52PM -0700:
Ralph Shumaker wrote:
I don't know if such a thing exists, but another way to keep a house
cool would be a thin metal screen (think like a security screen door)
covering the roof with a few inches gap in between. The attic would not
get nearly as hot from the sun beating down on it.
I don't think I buy this.
At the very least, if your suggestion works, I don't understand why I
shouldn't want to use a white (or silvered) tarp over the entire roof.
So long as there's air movement underneath, I think you might. If you
don't mind replacing it frequently.
Light-colored shingles work better than dark, after all.
Another problem with screens and tarps is that you can't walk on
'em... which makes roof maintenance difficult.
A friend of mine's roof has vents in between each rafter along the eves
and a vent all along the ridge. Air flows in under the eves, along just
under the roof, and out at the top. It cools the roof to reduce
radiation from it onto the ceiling below, and allows hot air to get out.
Karl
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