what is R factor? how do you have UV on the windows?! f: d! {1 E& a8 `* ^7 e
ChiaPet 发表于 2011-2-18 08:53
- c, L1 d% `3 v: e0 Y6 mR factor is used to determine insulation capability.9 K/ k# ^# ^" X; F5 |/ t
' u4 K8 W+ e2 u6 @" W1 jHere 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. / ?1 @1 ] i+ l* L% ?# E7 j$ {6 Y) F- q/ b8 z
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.& h) h$ \& ~) h6 Y! `. r: j
. T! ?( e8 O( LHere 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. / @ `" l5 k J ... 5 R2 I, g1 K8 C4 D A; U7 `小黄 发表于 2011-2-18 09:06
8 z* g, M1 l9 X* v/ g$ j! F
Thank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote. ; v/ \& o/ n! n. fYou don't have to upgrade all the windows. Only the important ones.0 K* n* x1 [7 [
小黄 发表于 2011-2-18 09:13