what is R factor? how do you have UV on the windows?$ A) j6 Y& A5 P5 \
ChiaPet 发表于 2011-2-18 08:53
& l U, M$ U# H: M4 m1 H; a% n/ A BR factor is used to determine insulation capability.+ ~8 i/ ^! I, P" D2 [; d t" y
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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.& y: D) ]: c5 K
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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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 . t: \. d d0 r Y# e& s( L& H; {
R factor is used to determine insulation capability. C7 {4 N# N" q: \3 y d4 [! j& ?1 J; S$ C7 G. x" @. w$ @1 `
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. 0 h5 b* a H% u, o" L ...) A2 S6 N& A2 A5 M" ^+ W
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?/ c# f3 W+ T/ \
ChiaPet 发表于 2011-2-18 09:09
4 W$ a5 \9 V: E2 ?7 r7 M) tAsk your builder to give you an exact quote.8 o6 A" Q' }6 q0 P/ f, [, w
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. - c/ P& A# e9 H# u% N3 x }You don't have to upgrade all the windows. Only the important ones. ; T1 a6 {# @& \$ ^+ W7 q/ Y9 o# O! s小黄 发表于 2011-2-18 09:13