what is R factor? how do you have UV on the windows? ' g; v; s: U' I+ k; aChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.9 A0 q7 T% {9 O0 z. F2 L
3 P+ |6 E) u' hHere 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., a% j( ^, t0 p3 d% t! o0 L
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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. $ J' n j: ~5 Y0 D6 E4 \5 d' F- u3 {0 N5 x. I" D9 \
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& q6 T1 |; u) }& ` ... ) G* \: V/ s% g. Z) A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? $ g* ^9 [0 g# w+ c* ]ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. 8 }7 k. H7 T0 G) F, F; [You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 5 t# n0 v% z% V* d/ r# D' {% kYou don't have to upgrade all the windows. Only the important ones.( Z' Y. C" ^8 c/ V% ~
小黄 发表于 2011-2-18 09:13