what is R factor? how do you have UV on the windows? 0 Y* {) m, m6 P9 D9 h h1 n+ p* k0 qChiaPet 发表于 2011-2-18 08:53
; g q1 b3 C, m8 m6 r- x0 c1 E2 uR factor is used to determine insulation capability. 4 D# M" Y; L5 P+ _9 w $ |( w. ~+ P$ ]" mHere 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. " f' q' A, J A# T0 d1 b3 q) r: z0 i' B
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.& I8 c9 J: A' s6 G% o) F
9 @9 w2 ]/ n+ E' X+ Y/ yHere 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 B- z$ s4 B3 v$ U: `& { ... # @' C8 l) o( r! [$ O+ P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? 2 i& U/ K6 Q, B( O! zChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. ) `3 ?% X4 S5 Q1 ?8 Y: z$ ~6 ^You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.! j) R- [$ u( E
You don't have to upgrade all the windows. Only the important ones. @7 i/ q- m& A* j小黄 发表于 2011-2-18 09:13