----- Original Message ----- :
: > roofing color.
:
: I'm in the process of getting a new roof.  The  Roofer people
: tell me that shingle color is relatively unimportant WRT heating
: due to the sun, compared with the layers UNDER the shingles.
: We'll see.  I'm replacing cedar shake with asphalt, radiant barrier,
: plywood and re-doing the whole ventilation system.

I suspect that the IR absorption depends more on the chemical compision of
the shingles rather than the colour of them.  IIR carbon containing
materials typically absorb more than more than others.  Concrete or clay
tiles may not absorb as much - you would have to look it up.

What will help you though is a good ventilation system for your attic as
well as insulation in your roof.
:
:
: > deciduous trees overhead
:
: Maintenance issue.  Fire hazard.  Pest path.  And trees only grow
: so high...

It is amazing how much cooling effect that you can get from a 100 year old
maple.  Not only because of the shade, but also due to the huge amount of
water that is evaporated each day.  It is very important to protect our
urban forests for this and a variety of other reasons.


Gordon Williams

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