 鲜花( 1181)  鸡蛋( 48)
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what is R factor? how do you have UV on the windows?0 p' h6 h4 v8 N7 L0 Z7 ?, q: N* ?
ChiaPet 发表于 2011-2-18 08:53  g7 ~0 I2 ~% J' u0 u3 {% K y+ M
R factor is used to determine insulation capability.. _, E7 [( d+ [
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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.0 J" s, T$ X, {# ?
, ~$ i5 B' |; 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. |
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