what is R factor? how do you have UV on the windows? 4 s" o2 M2 w4 z# I+ v( XChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. ! u0 ]; g6 c7 A- [1 G$ e. t6 |; {1 T$ ~3 |: U% F/ e1 } m/ g! L
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. % L% S) u. Z7 O& }/ M; k6 j3 A7 V( `8 f5 u! e: R6 @) k% G
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.6 m8 |4 a. D5 i7 z
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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. ) @* w4 a9 ?" w0 l ...% A S) B5 F6 W4 G6 q% L
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? 4 Y; ` n, n' \" RChiaPet 发表于 2011-2-18 09:09
2 t. ^8 P; q2 Y, L) qAsk your builder to give you an exact quote.6 t; S/ v3 R3 \. T' ~$ ?
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. ; [, j9 z: @6 `You don't have to upgrade all the windows. Only the important ones. ' I' X3 `" b: w( k小黄 发表于 2011-2-18 09:13