what is R factor? how do you have UV on the windows? 8 [) \5 H3 ^% k" K- s. zChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.6 t: J P& w" L) |1 l9 s
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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. 1 E" n/ k. C3 r+ X/ ]/ B* v: n# i+ o# Q5 ~2 e: ~( n }
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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 0 {$ u' r1 [- l3 j e, q4 [' i
R factor is used to determine insulation capability. $ @4 l/ e& f% P V- [/ y , H! j* u3 ^5 d5 Z; THere 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." g0 J! F* }7 Z* ~1 o
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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?' m! T% K# c3 _: f7 Z
ChiaPet 发表于 2011-2-18 09:09
% F7 K5 g4 a& [0 vAsk your builder to give you an exact quote. ! T2 ?. a( U( q8 x( N8 U! D) f% G2 tYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.- B! w: D9 F$ ]3 @% h" z
You don't have to upgrade all the windows. Only the important ones.) x+ E: ?" |+ c1 q8 L
小黄 发表于 2011-2-18 09:13