what is R factor? how do you have UV on the windows? 7 h% D1 ]6 l# x+ |% Y3 sChiaPet 发表于 2011-2-18 08:53
. l& x2 [ W2 q6 {* N- R8 Y0 l% xR factor is used to determine insulation capability.0 E$ V5 x0 i; o0 }5 s
. u4 n4 q7 Z- l% q! f; b
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. 0 g% o2 F% o7 y8 U8 U 4 s3 u ]" }. J" z0 uHowever, 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 4 S C+ q$ N! ^8 S
R factor is used to determine insulation capability.$ M$ s5 X; D0 t% l
7 @( s5 ^; q# l& K9 uHere 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. 5 A& _, n: F5 E) X5 v1 w/ ? ... 4 L/ G' w& X9 o7 ^2 I小黄 发表于 2011-2-18 09:06
* _& d+ ]+ @# T( @Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?- `* |9 w- z5 n
ChiaPet 发表于 2011-2-18 09:09
4 y( P2 ]/ t) w
Ask your builder to give you an exact quote.1 n; ^& \+ i1 h0 S5 B8 t
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.. [7 Y% b4 a6 Z4 q7 y' z9 k8 o
You don't have to upgrade all the windows. Only the important ones. , d( V9 w: T' Y0 s$ s! O! u小黄 发表于 2011-2-18 09:13
( n- Z" X y/ q( u3 t / ]- _0 I7 P( Z; k* `8 }, Kit must be one of the best, get lot of sunshie, summer may be a little hot, but winter it will be so marm.