what is R factor? how do you have UV on the windows?, l; P% a; N6 c9 R! h$ w9 _2 k
ChiaPet 发表于 2011-2-18 08:53
2 P5 y5 Z0 W [& g8 H/ YR factor is used to determine insulation capability.8 O1 s( I- V+ K1 R
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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. * s) d# g, h, H+ i7 n! Z0 x2 X# g5 c/ D/ ?
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. , ?. e$ B) d, R8 X4 r- R2 i) H% ~ 9 H0 j4 r& B4 W# j" 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.4 `9 z# S. x) C; ^% @$ E5 x8 k ^# r
... ) y9 R( f2 t& B1 v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?! l2 l/ J) s* d6 u/ O7 b
ChiaPet 发表于 2011-2-18 09:09
7 f) b$ g' b G8 ?Ask your builder to give you an exact quote.6 g1 G. I5 _/ F' k' |* H
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 1 d; w% b4 E2 }+ n3 @ O$ }2 X, jYou don't have to upgrade all the windows. Only the important ones. ) M) u5 B/ e! M- _小黄 发表于 2011-2-18 09:13