what is R factor? how do you have UV on the windows? % @( q% D( M7 tChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.( w( k0 v, f1 o
0 T* r6 I0 o' i; oHere 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.9 K4 f9 m+ p' I5 ^3 ^ f0 X
0 `9 p& s" d h. \7 b/ m: }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 ' ?4 r3 ?! w( D( ^# E. l' a
R factor is used to determine insulation capability.5 `! _- W4 E& `4 m9 ~
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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.# Y. O T. |, _) ]8 ^
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小黄 发表于 2011-2-18 09:06
2 P5 O0 u2 Y8 C$ N! V0 y+ f1 _Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? U9 C' y5 V( |ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.. u! u' F( s( H
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. + L8 i8 X5 q' p' s6 xYou don't have to upgrade all the windows. Only the important ones. . x! D' n( B- G小黄 发表于 2011-2-18 09:13