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Heating/Cooling & roofing material

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Posted by JNJ on July 27, 2003, 4:05 pm
We'll be re-doing our roof not too far from now and I'm starting to look at
materials.  I want something that has it all of course.  :)  The attic
bedrooms get pretty durn hot during the summer and quite a bit chilly during
the winter.  I'm looking at other conservation techniques as well of course,
but since we're redoing the roof I thought I'd inquire into what materials
do the best job these days.  Right now we just have black and brown
composite shingles.

Thnx in advanced....


Posted by Anthony Matonak on July 27, 2003, 4:40 pm
JNJ wrote:

Well, something light colored will reflect more light and heat than
something dark colored. Roofing materials have come a long way in
the last few hundred years but I still favor metal roofs. Done right
they will last much longer than most every other roofing material.

You might consider, when you have the roof redone, that you could
install a few inches of foam board insulation on top of the roof
deck. With additional insulation in the attic or crawl space (if
you have such a thing) and proper venting, this should go about as
far as you can go with fixing your roof.


Posted by JNJ on July 27, 2003, 7:36 pm
So a light grey colored shingle will reflect the sun for summer coolness but
that of course leaves heating the upstairs.  Insulation will take it part
way, so now I need to look at passive solar solutions that I can retrofit to
the house.

Hmmmmm...  I'll have to look into this one.  For some reason it just did not
occur to me to add insulation when I tore off the roof.  Major duh factor
here.  :)



Posted by Chris.B on August 1, 2003, 8:40 pm
 FWIW: I was in a building materials yard the other day under hot
sunshine and 28-30C (80+F) shade temperature. The coolest material (it
actually felt cold to the touch) was white corrugated cement board.
There was little difference in any of the other corrugated cement
boards regardless of colour. They were ALL far too hot to touch from
light orange to matt black. As was natural dark grey slate and
concrete and clay roofing tiles of all types & colours.
 I was looking for a cool roofing material for my garage-sized
workshop that's built but has no roof cover yet. I had used red-brown
corrugated cement roofing sheets on my 1 1/2 storey home. Using 12" of
rockwool on the sloping roof areas and 16" on the flat area under the
peak of the roof. The roof material gets too hot to touch in the
summer and indoor 1st floor temperatures hangs around 24-28C (78-82F)
day and night for months. Despite windows being open most of the time.
Really too warm for comfort. It's much cooler downstairs though. So
you can see my dilemma about roofing choice for the workshop.
 Unfortunately white is not a popular roofing choice here except for
farm buildings and architect designed modern homes. But the other
colours (including black) are all popular roofing materials here. I
wish I'd fitted white now instead of a more conservative roof colour.
If the South side of the roof did not face the road I would re-do it
in white like a shot. It might still happen! I can always pretend it
was designed by a famous architect. And it will match the workshop!


Posted by ragno nero on August 6, 2003, 9:08 am
 If you are able to understand this document (it's in italian) you can try
very good news... http://www.ecostudi-cde.com/news/12.htm



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