what is R factor? how do you have UV on the windows? 3 }7 h% D4 S& j2 Q8 iChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. . a' L3 w. O. ?1 c0 v( g9 g / f, P2 ]# K8 k% X0 }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. 4 `0 T* c1 A& H, n, G. | t* m7 p8 n- u
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. - [) j$ N2 ?1 i- V: S # M$ z0 i( J: \7 M" m! g& g) oHere 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 N4 p( U2 `5 s% V
... 3 J9 c1 | `& q8 K g小黄 发表于 2011-2-18 09:06
; b, a5 v C8 J" T$ ~! D3 p, kThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?& O9 J4 C& s! F8 E1 Q3 E$ e! F1 B
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.% g: A8 D+ f, u6 I( \& u
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.1 q" T+ I0 o; u; Z) Z
You don't have to upgrade all the windows. Only the important ones. : v; ^7 P! j# S: r) [小黄 发表于 2011-2-18 09:13