what is R factor? how do you have UV on the windows?+ S7 e5 a f: F% D' U8 |& _6 A" e, i( @
ChiaPet 发表于 2011-2-18 08:53
/ J( A) c8 a5 lR factor is used to determine insulation capability. / k) w- ~4 v% a$ V7 W0 D Z# i% o; c( X5 S+ ?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.2 O- r% Z& h& G0 r8 Z0 h8 l3 W
2 T! W& k0 ]% d4 ?, I6 M, e% gHowever, 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. C* n- E1 o+ `" a% C) y; 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. & `: x" Z1 z8 e ... d/ S( |' F7 f
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. % T0 _8 |7 i& b% J& ?You don't have to upgrade all the windows. Only the important ones.+ U. e. p8 V3 A5 _8 O" I; _3 A
小黄 发表于 2011-2-18 09:13