what is R factor? how do you have UV on the windows? 7 Z- Z \# x. l0 m! SChiaPet 发表于 2011-2-18 08:53
/ J8 h3 }. m; y2 uR factor is used to determine insulation capability.# S g$ M) b2 g2 k
$ ^( i$ i4 y7 \1 S/ I/ |; THere 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.) G2 u9 r/ T5 @1 s
, u; V6 M" H, u( O/ k5 aHowever, 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. 2 \8 m2 ^# K# S. }4 j9 I) r- a: I+ Z+ t) U
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. ! ^$ `* M: }' ]' r* @* r( ?! t8 o ... + @0 Y- p/ C4 f9 Z/ @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?
Ask your builder to give you an exact quote. / B) [7 q5 |# q6 rYou don't have to upgrade all the windows. Only the important ones. 7 |. [$ X3 j) B7 R& ~$ Q% N* ?& H" s小黄 发表于 2011-2-18 09:13