what is R factor? how do you have UV on the windows?2 k5 L% w; r1 V. ?
ChiaPet 发表于 2011-2-18 08:53
A* F! B& D4 g: tR factor is used to determine insulation capability. & j a, H4 }6 K% W. n. b7 @ o' }2 n. a$ t* [. iHere 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. 3 `- B* k2 L; E" U- s2 r% I- U( }* x& H. ^! R9 Y
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.. }& c* _1 j8 B8 r& t
/ m. Z0 r1 h4 E3 i' r. G, p! k s
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. 8 X) ^0 p: o7 c/ p: Z$ c" T ... * I& o( `: i4 L( B: I6 ]5 W小黄 发表于 2011-2-18 09:06
* S& ^) U$ N' I9 C$ @Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?2 B% r6 ?7 K" R% [8 u2 ^$ {
ChiaPet 发表于 2011-2-18 09:09
f) d I8 S5 e. EAsk your builder to give you an exact quote. , i4 l V& ]: q2 Q: y/ _' Q0 eYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.# M* |, |# O0 D7 R& t5 t7 D) l
You don't have to upgrade all the windows. Only the important ones. / G8 |9 O5 X% O小黄 发表于 2011-2-18 09:13