what is R factor? how do you have UV on the windows?8 D4 y' N) \ L. h% m* X' n
ChiaPet 发表于 2011-2-18 08:53
. ~% N" B% w! A) }R factor is used to determine insulation capability.( ?/ Z' v: A2 m( W
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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 u% V5 k: C5 S- p( n6 B. t& i% T, e% W: N
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. 3 U% G6 G8 i9 ~/ { ' x8 g" Y- ]3 ^2 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. % T7 A8 ~* G# [# [' j: O1 }$ ` ... 2 b: a. q" ^9 [ q- P) `小黄 发表于 2011-2-18 09:06
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Thank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much?& ^9 ?4 G# B# ~
ChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. : c+ K, y* c; V* L( O7 j) W5 kYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.1 A/ L- K# O$ W( }
You don't have to upgrade all the windows. Only the important ones. U9 ?: H- G1 L
小黄 发表于 2011-2-18 09:13