what is R factor? how do you have UV on the windows? 6 q' L; ^; w! t, pChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. $ \: N i8 U/ B/ { 3 }( I" w+ x& y6 e3 c/ T, PHere 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 X1 L) x4 _% ?1 g. i" |8 r( V0 [& t( G$ g& _$ F( T
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 # W1 R+ w% d1 p" O M* P4 I" N
R factor is used to determine insulation capability. 0 j W, x9 N% q/ o" h* S8 [7 ?7 j' H
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. g# B9 T3 [# w* y* Y K b; U' _ w ... * I* }7 Y2 x1 h小黄 发表于 2011-2-18 09:06
, Q4 d1 i, g/ p4 w' Y0 OThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? 3 h( o% l* `9 _ChiaPet 发表于 2011-2-18 09:09
6 C& y5 q0 H% T# d- d1 c" PAsk your builder to give you an exact quote. / O1 S& U6 \+ U6 c! x/ xYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote., e) r/ c8 C/ c4 j7 _3 l
You don't have to upgrade all the windows. Only the important ones. ) w& C x, o$ Q/ w( G小黄 发表于 2011-2-18 09:13