what is R factor? how do you have UV on the windows?$ Q8 e" E# F3 A) }
ChiaPet 发表于 2011-2-18 08:53
/ s% D" T3 |! k4 b* YR factor is used to determine insulation capability. 0 i7 X. N& T9 X z7 y D4 ^: g2 q d9 d$ E/ k1 WHere 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. ) K1 F, P) O: Z. H, l' C0 F; g4 i7 @, T3 Q0 [' Q
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.- X. M1 ]! ?, n1 R; D }
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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.+ W+ |) o5 a2 X9 T2 J
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小黄 发表于 2011-2-18 09:06
+ m1 {+ m" h) D+ Z+ G& } aThank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote. D- q4 y9 Z. S. `/ U: h6 C- \ M
You don't have to upgrade all the windows. Only the important ones.: |6 G5 I* a! n" [6 g) c: f; `
小黄 发表于 2011-2-18 09:13