what is R factor? how do you have UV on the windows?4 a7 b/ ]6 u" q
ChiaPet 发表于 2011-2-18 08:53
5 B. |- m8 {/ |R factor is used to determine insulation capability. 6 _+ u1 X8 {6 g 6 ~- c3 `. |+ g. |. AHere 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.$ }: f8 s6 t- H6 L. e4 Z' t
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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.2 S) t9 e" M$ s! I. 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. N U1 D. I( q3 p$ Y ... 0 y0 E: [+ }; X$ t6 M/ K$ v小黄 发表于 2011-2-18 09:06
5 ]4 b, @; @, N! [! z3 [1 V' kThank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote. 6 C6 }6 ]/ z' F, e/ C3 U* bYou don't have to upgrade all the windows. Only the important ones.) Y0 [& J ` {: c' Q
小黄 发表于 2011-2-18 09:13