what is R factor? how do you have UV on the windows? , a/ S9 Y7 ~! X Z- s( f* xChiaPet 发表于 2011-2-18 08:53
+ T' t( X4 i# W6 L. sR factor is used to determine insulation capability. & x" f: V& p4 X. T; L) ]6 v0 \3 V$ f0 [" `
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. . t, o! n/ z" h8 s+ a! B- ^+ [. a# A, ^8 E
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 1 D$ B) d5 e# p" a7 U
R factor is used to determine insulation capability. # S* E8 y# E8 a4 j 9 N) {! p9 ?: b& G; z" X, sHere 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.# q% p, \# z6 _- T2 z6 ~
... . i) e) C' p8 v& Q7 }. ~小黄 发表于 2011-2-18 09:06
; z* k, q/ \) q2 m& x- B. G, EThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? * @" b; R% W7 G; n3 q$ a* c+ sChiaPet 发表于 2011-2-18 09:09
/ D3 F8 n% g6 k' F1 g& E7 ^- k9 ]* ]
Ask your builder to give you an exact quote.1 M) V% {4 K- }6 }- J# U8 m
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.3 y& d; k" |* {5 P
You don't have to upgrade all the windows. Only the important ones.2 A9 ~/ ]1 @! t% H
小黄 发表于 2011-2-18 09:13