what is R factor? how do you have UV on the windows? ( k( m8 I1 C8 yChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.2 j' D; B; G( ~
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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. & I6 c. j4 y* _. L- a2 U$ Y7 Y9 ], h: c5 j
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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 + o( D/ v$ a, D9 I% i
R factor is used to determine insulation capability. 9 I% I5 b; G% R; q* z' w( }. a# z# [& x9 [0 W" U
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 T1 |4 ^8 r4 s
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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?4 V* R7 } a1 M8 o) C2 ]" s7 Z
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.+ a0 n7 A7 [* } @+ u& r4 n
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.2 h6 g% F+ Z8 {* w
You don't have to upgrade all the windows. Only the important ones. % }' l p. G' Y$ \+ p小黄 发表于 2011-2-18 09:13