what is R factor? how do you have UV on the windows?% [% |4 Q3 Z0 Z/ `& ^! [! W
ChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. 1 w0 h' _4 C. } 4 l4 d$ K* {, o" q! bHere in Canada, walls are well over R20. So, even if the exterior walls are hot under sunlight, it won't really affect interior living space. & p" m( l7 c8 E3 E+ @4 d' x: a4 Q) H
However, windows have lower R factors and allow UV radiation (and radiation of other frequency) to enter the house. So, it's best to upgrade your windows, if radiation (i.e. sunlight) is a potential problem. Typically, you can upgrade your windows to triple pane, with sun-stop coatings on both sides.
R factor is used to determine insulation capability. 6 B3 S- L- J- G & z$ d1 a+ z3 Y* JHere in Canada, walls are well over R20. So, even if the exterior walls are hot under sunlight, it won't really affect interior living space.% F! {3 n5 y' O& l9 N) Y
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小黄 发表于 2011-2-18 09:06
6 e& _* t! R9 r4 u) s ]Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? 1 Q+ c( [" x0 ~ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.1 @8 N- G1 J' N" @/ i/ p9 r7 A
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. & {6 W( [% p$ b% {( {5 G/ v; Q( IYou don't have to upgrade all the windows. Only the important ones. * q: o/ z4 m) ?4 z: L5 N/ v) R小黄 发表于 2011-2-18 09:13