what is R factor? how do you have UV on the windows?6 n6 L( o1 v- {2 ~$ @3 F% Y
ChiaPet 发表于 2011-2-18 08:53
* V3 {1 z+ ~$ c- o- k( T( i; l
R factor is used to determine insulation capability. O& |2 \2 W3 O& O 4 q$ S, s: ]( I* ^/ Z2 B3 F* F4 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. . p/ n5 H0 z0 c8 T5 e! a, g+ n# e/ s $ v) ~5 M& C1 U5 R% [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 * c y7 Q! y; m' B+ {4 B) p
R factor is used to determine insulation capability. , B B1 Q w! Y* `. S: ^: v# M9 l" r" Z# M3 M6 J/ y4 H% i' _
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.- i7 C/ C! J. R& g d0 `. x
... 8 I0 k, O4 W& d: r1 r小黄 发表于 2011-2-18 09:06
( W8 j( Z- s# e8 QThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? : ]0 Z1 @% {5 M( ~' |ChiaPet 发表于 2011-2-18 09:09
' P" B) `( S0 a0 g/ t# d+ w! I; XAsk your builder to give you an exact quote. 0 h- b, S) Z8 \+ b5 y% ZYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.2 m. _3 k2 C B1 G
You don't have to upgrade all the windows. Only the important ones. ( S3 n" w# s* n6 ~/ Q) X小黄 发表于 2011-2-18 09:13