what is R factor? how do you have UV on the windows?5 H0 [& T: ]5 N
ChiaPet 发表于 2011-2-18 08:53
3 E7 U1 t! b: `- iR factor is used to determine insulation capability.9 f/ b6 |7 L9 T r/ H( }- k
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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. # p9 [# c7 t- e3 P! H+ Y! {$ r8 C! \7 A# S" X
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 ) f7 E, W0 J# ^, ^' L- }) I; Y
R factor is used to determine insulation capability. , S. A' n8 {- s% b1 y: e0 ?! L* ?+ U( Y& c2 Z/ J6 z/ \0 N
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.9 Z+ U$ A, u, s% m8 l4 ]; O2 p
... ) b) T2 k- n, c& C; _2 J5 v O+ o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?0 F" _: Z1 M7 R3 u& D9 ^4 T/ u% h
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.+ B. l3 K, f8 x. l# |$ p
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. 4 c: I* U- a: `1 DYou don't have to upgrade all the windows. Only the important ones. 1 Z/ S/ o2 o6 I6 W) J小黄 发表于 2011-2-18 09:13