what is R factor? how do you have UV on the windows? 9 {7 R; |) |" n: q2 f' Z' LChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. 6 L6 v- M7 c3 X! S8 _# e ) E# E% ]. k* y" f. S) a1 g/ Z fHere 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 A: `* V0 e1 X, d1 p3 E 7 l& h% Y: H GHowever, 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.( U. t* [$ T8 i0 @, s( y# C5 P
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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. " W1 V0 W9 z; J8 D6 e9 X/ m9 z ... 7 ~, u1 O3 I6 Q8 j小黄 发表于 2011-2-18 09:06
t3 ~/ n/ s% u; S+ y4 @9 m- wThank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote.- i' Y' T% | U& a* Z$ X& m/ A# r
You don't have to upgrade all the windows. Only the important ones." K# B# S! _6 H; Q
小黄 发表于 2011-2-18 09:13