what is R factor? how do you have UV on the windows? 4 [2 l- e9 S) j9 t9 o5 rChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.+ ?; L' O# {) I8 K
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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. * ^; v: ~5 \# y& u $ X4 u1 [; ^$ ? [3 G8 F4 c( ]- wHowever, 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 % }5 D" x* p; A, K
R factor is used to determine insulation capability.% \" m- l Z U2 \- 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.; @( c8 g1 h7 d5 J% V! |6 E0 S
... ' U4 F- ]) e% {- ]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? 1 [; ]7 `9 o% ~ChiaPet 发表于 2011-2-18 09:09
; B2 w, F0 V/ v1 oAsk your builder to give you an exact quote.; q2 k5 c# K& b+ h' [4 F* n
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.) D S f2 E/ |2 a. j
You don't have to upgrade all the windows. Only the important ones. J* Z% O# J4 {3 B! ~( t: |: b1 k3 e小黄 发表于 2011-2-18 09:13