what is R factor? how do you have UV on the windows?+ A: L8 e! i+ M: P3 M
ChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. 0 ~! V) a. w- M2 `- B1 @! |( s6 a4 J
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./ T, Z" I9 ?4 G$ B( j8 f
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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.
R factor is used to determine insulation capability. . `& e0 U- G u/ M3 Y% _ ; V! {6 g: D$ dHere 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.5 Z6 J$ i# t" e) g- Z6 j
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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?+ z. b0 j( G, U
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.& _1 |7 a9 O% X, d; g7 Q( p. Z( [4 y
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 8 c1 {) V9 s3 ~0 `. Z3 WYou don't have to upgrade all the windows. Only the important ones.8 m$ G/ \4 s& |) ^
小黄 发表于 2011-2-18 09:13