what is R factor? how do you have UV on the windows? ' k1 `% n' T ]8 R- l, mChiaPet 发表于 2011-2-18 08:53
1 r8 j* o1 B: i `5 fR factor is used to determine insulation capability. 4 _2 ]& ~, t. k j2 @( p# C$ `
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.. x1 Z; D% _$ K$ a# X
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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 * [1 n& Q% U `( U8 Y
R factor is used to determine insulation capability.. d; W" E( O4 ^2 T, W: m6 g3 \5 b
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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.' q2 H& X; V, [8 Y9 D" f2 s) b6 F
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小黄 发表于 2011-2-18 09:06
w# V( D/ ]0 X1 u9 c$ U3 XThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? $ Z4 }8 r& E- zChiaPet 发表于 2011-2-18 09:09
. @. _5 P0 D. h) G% nAsk your builder to give you an exact quote.) S. Q: _1 d' [9 T
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 7 v/ ]+ r8 w+ j [You don't have to upgrade all the windows. Only the important ones.1 g* H! t- O/ A, k E6 H
小黄 发表于 2011-2-18 09:13