what is R factor? how do you have UV on the windows?* j0 q7 A- \- t, [5 g
ChiaPet 发表于 2011-2-18 08:53
1 }- M& I# ^% v$ i; n& a) ^3 R: tR factor is used to determine insulation capability. 0 n3 \; f j$ S2 e3 a 3 h- ^) d2 A+ A: r0 ^, HHere 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. % z7 s9 F0 K: b2 G# u: J; b- w& W5 Z& C) f; X: q2 i% S
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., {# |" f1 j1 J9 z& D
1 e1 E- g O5 L5 [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. 7 Q7 R! R3 [: x8 |3 J" t9 u" } ...5 z0 G% L4 M5 |* W1 o7 E h
小黄 发表于 2011-2-18 09:06
) ^8 E, `1 Q/ B2 Z0 \& PThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? ; u! H* ` V6 w& Z aChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. , G# o) @7 e9 t# ?: BYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.. S) q Y7 F( ]4 T7 [' ^
You don't have to upgrade all the windows. Only the important ones. ! g {, j P3 V小黄 发表于 2011-2-18 09:13