The earths aggregate albedo is irrelevant to this discussion- it is the
heat load on the house requiring expen$ive cooling in summer. Of course,
you WANT free solar heating up north in the winter, but A/C is usually
more expensive. Even up north here, though, most people go with light
gray, to keep attic from superheating and radiating back down into house
past midnight in August.
No, the earth's aggregate albedo IS the discussion - at least that's what
the OPs reference was about. The Nobel Prize winner was advocating painting
roofs white to raise the earth's albedo. He wasn't the least bit interested
in my mother-in-laws air conditioning bill.
Just to pick a small nit, in this case it is probably a case of city
building codes instead of deed restrictions, but I digress.
I am thinking that since it is concrete roofs this is some
engineer's bright idea to cut down on hurricane damage to roofs. I
wonder what would have happened had be just painted the concrete a
different color instead of putting on asphalt shingles.
The inevitable Godwinization of Usenet threads is a principle
as immutable as Newton\'s Third Law meaning that, for every action
It is deed restrictions. I have a copy. All roofs have to be white. No
asphalt allowed. The city was started by the developer and when enough
people bought, a city was born. The developer ruled for many years.
What Paint co is pushing this crap. The tar companies say we should
tar our roofs black to help reduce global warming, in winter black
roofs are warmer from sun.
I think you're right on some counts but here in TX most of our energy bills
in the summer are way-way higher in the summer than the winter. (I say most
because there are neighborhoods with "only electricity"). A white roof would
probably give some relief. Many of the houses here have white shingles. I
have a huge live-oak over my house that would stain the crap out of a white
FWIW I have a light cream colored steel roof on my garage, and a brown
aluminum roof on the house. The A/C can be on in the house and the
garage will still be cooler. I think there may be something to this.
What is the big deal?
It is just our wonderful big government watching out for us;
something like small flush toilets, CFL lights, and roller skates
from the used to be Chrystler Corp, and GM.
White roofs is just the beginning. Wait until they tell you what
time you have to go to bed and brush your teeth.
I can't wait to have seasonal roof changes here in Wisconsin. White
in the summer to save energy, and black in the winter to save energy.
Don't forget.. its for the children and their future!
If you had solar panels your roof wouldn't need to change color and
you'd have all the energy you needed.
The technology to have an efficient roof has been around for a long,
long, long time. It's called a cold roof. The roof is basically
built in layers. The top layer (shingles, metal, EPDM, doesn't really
matter what it is, doesn't really matter what color it is for the
_house's_ energy consumption/efficiency). It keeps the rain out and
the snow off. It may or may not have sheathing depending on the
actual roofing material. It is supported by wood strapping (doesn't
have to be wood, but like I said, it's been around for a while) that
provides an air gap under the top layer. There are ridge and soffit
vents. Below the strapping is the structural roof (rafters with
sheathing and a membrane on top, or SIPs), which is insulated if the
attic is to be habitable.
It is a far superior roof system in hot and cold climates and _that_
should be code. Everything else is just diddling around because
construction is so slow to change. and well, "I've been doing it this
way for 30 years!"
You can say whatever you want about global warming, personal choice,
political affiliation, etc, but if you like to think of yourself as
not being your parent's stupidest kid, please try to be efficient and
don't piss money/energy or anything else away. It's disrespectful to
your ancestors - and everybody has some - that died/roasted/froze/
starved or were bankrupted for want of some resources.
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