what is R factor? how do you have UV on the windows? ; Y; V. x6 B( U( }2 T1 q) `! T$ O) h# ZChiaPet 发表于 2011-2-18 08:53
9 L+ M1 M/ c4 ]" H* ~6 o4 V1 i: vR factor is used to determine insulation capability.+ g) d7 M: y+ f) o7 w$ f
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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. + m( ^5 n& H8 f! D* H- @9 `6 e0 ]6 f$ y# }6 L
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. ' l3 B6 \" V7 Q" L, b+ m 0 Z" W0 Y. j% J) n. ~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. 4 U$ ?% u: n, I# b4 ^ ... 7 t: r7 n0 }& @9 e5 J小黄 发表于 2011-2-18 09:06
$ V6 X' j$ O1 P+ R+ ZThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?7 g+ |/ d- }! z# y7 U- h
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. x* D2 C d8 t a3 Y$ P8 XYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.9 U. H" a+ W8 z, q: o" y2 ^
You don't have to upgrade all the windows. Only the important ones." d( i3 D* x' Q. H3 u; s7 t
小黄 发表于 2011-2-18 09:13