what is R factor? how do you have UV on the windows? ; O% b3 N; u; D5 q* qChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. 7 C5 v" ^, u+ B8 i/ B 5 T' i) o1 L7 s+ \2 KHere 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& }0 m" P! C; K9 L8 K( Y# f& G
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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. ; t/ E6 N7 f# N3 v# R ' m- _' i8 O6 g. `( v1 SHere 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. 3 C9 a. D3 X n: Q1 S! R: j ...' X6 V. Q* W5 C) ?
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? 3 v6 [$ q2 `* Y1 N! g7 N; eChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. O" w& p) T3 RYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.4 ?7 [$ b( \" Y
You don't have to upgrade all the windows. Only the important ones.8 t+ l' f% K6 J# d) w5 t- d
小黄 发表于 2011-2-18 09:13