what is R factor? how do you have UV on the windows? 8 g( c1 I; }5 ~' k! `& F1 K: YChiaPet 发表于 2011-2-18 08:53
+ @, R g3 e/ Y4 b: Q( s2 RR factor is used to determine insulation capability. ! {% U/ e5 k3 g7 Q# Z* x0 L% P( }2 b! o1 E- P2 ^# k
Here 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. 6 r& V: B7 ^* K% A; |5 ] F5 \3 b8 A
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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 + t; a+ d `$ F. V4 }: b; ]
R factor is used to determine insulation capability. 1 G# C( g: }6 i; O/ b4 j- ~3 ` o; Z* O4 x I) t
Here 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. 5 Q$ ]) i1 e8 R" n: S ...% A3 [$ _* Z1 c# U, G' J
小黄 发表于 2011-2-18 09:06
: R, E4 m4 v" `4 _& J) TThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?- g& t# r! A0 ]# V9 h7 I' V
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. % K) ^$ V" }& B$ Z! vYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 8 h% Z X, {& a, Q) x! Z4 {1 k" N' X DYou don't have to upgrade all the windows. Only the important ones. 5 V4 D4 v; u& p/ X$ [& }/ _小黄 发表于 2011-2-18 09:13