what is R factor? how do you have UV on the windows? 4 q) e% H# G7 D" W, p5 TChiaPet 发表于 2011-2-18 08:53
5 H2 x# o' P& I. l" `9 l# l% j. Y( q& HR factor is used to determine insulation capability. 0 a0 a5 g% C9 n7 V L0 v2 _% y$ a5 O3 U. K( bHere 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 r' G8 H7 |& ?1 N! w3 J* M ' L2 t7 y# k. ~( @$ z0 pHowever, 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 0 s" u" n y6 Q8 e' ?* ?$ v
R factor is used to determine insulation capability.; b6 k+ }% ~9 J, g
: j H% z9 e$ f. L$ X& ] G q
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. 6 u' W1 D8 l6 `2 s7 k ... - }3 c" j* }. u小黄 发表于 2011-2-18 09:06
; l5 p5 k! p+ F
Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?" p- U0 }' A" y9 ]2 u7 S4 T* \
ChiaPet 发表于 2011-2-18 09:09
6 }6 Y2 D4 G& o* CAsk your builder to give you an exact quote. 6 g! p4 h. @6 L8 N; \1 OYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.3 b# n/ `0 Y4 f' ^( S4 [+ M
You don't have to upgrade all the windows. Only the important ones. : h- g$ V1 x7 e; h$ G小黄 发表于 2011-2-18 09:13