what is R factor? how do you have UV on the windows? / t9 _6 E+ c6 v4 M8 d5 Z. OChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.+ _0 F" ^3 @9 r F( a 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. 6 X+ L. d7 @9 _2 G5 _. Q! N& x. J) m & `9 p+ H5 r5 }2 G+ b+ p1 KHowever, 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. ! g0 l6 X1 z& N' z% R; u+ Q9 d. d% l, w! u8 Z) R: Q j7 B n# p
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.# x4 {: b4 ~$ |. V" E
... T6 D6 w- q0 H' z5 `1 P5 Z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?
Ask your builder to give you an exact quote.* p/ U% p! f3 `: f6 q
You don't have to upgrade all the windows. Only the important ones. 4 I+ b/ S+ z: n( Q4 p小黄 发表于 2011-2-18 09:13