m Ransley wrote:
Aluminum is a thermal conductor, but wood and composites are going to
have good R value. Even so only aluminum would figure into a
degadation that shows in U values, the overall window rating. I hope
aluminum is not being considered that far north, as all aluminum I
see are realy U rated for southern areas. But true 50% of the loss
can be the frame.

I agree. I don't live that far north and I would not have aluminum
fames, even those with a thermal break. My last home had aluminum without a
thermo break. Really bad idea.

--
Joseph Meehan

Dia duit