what is R factor? how do you have UV on the windows? / W) h4 O# O4 F7 {! y5 RChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. 8 x$ d: n. e. T" l& s& M0 J- N. s$ P6 L! H+ @
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. 0 m! f5 `, k w+ x& Y' \* _) ` 7 Q( b4 I8 V! [+ _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. " S7 v5 f# J3 P! s! ^' W, G, t& }7 n$ g3 ^" o( o6 v
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$ y% l& Y/ x* V$ a4 O
... , h1 g1 n* o* S4 b: j小黄 发表于 2011-2-18 09:06
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Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?7 G0 L% T5 n9 ~* P5 L
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.! J+ C8 o8 ]# h7 F$ I
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. ; u* @% P9 S. p3 f' I- N1 eYou don't have to upgrade all the windows. Only the important ones.8 h3 u5 C) T7 ~' u, v
小黄 发表于 2011-2-18 09:13