what is R factor? how do you have UV on the windows?8 Q# a* I5 J6 X) a6 B% i) C
ChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.7 ~# n3 X: ?9 D3 U; Q2 t, |9 U
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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. N0 l, f( e3 ~' g9 r7 R8 p" Y7 X
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. " k4 ]0 w. L" T, V8 s7 k- Q% @; @2 q
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. # Y4 n; b+ O; }$ u) m, Q( n9 n' P ...8 \9 g; B# i5 K4 d' ?
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? 6 j+ g4 b7 _- S8 d# t( SChiaPet 发表于 2011-2-18 09:09
1 |3 c' Q" _5 @" Y, E& G, C# @Ask your builder to give you an exact quote. / H- e( }$ w0 I6 z- ~, jYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote." Q( ^2 x0 y3 P9 x _, Z
You don't have to upgrade all the windows. Only the important ones. " i6 P( Z; _- s% a3 M1 u$ I小黄 发表于 2011-2-18 09:13