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how much difference between R19 and R20 insulation, need help, thanks

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鲜花(9) 鸡蛋(0)
发表于 2010-5-31 14:48 | 显示全部楼层 |阅读模式
老杨团队,追求完美;客户至上,服务到位!
how much difference in price and quality between R19 and R20 per square feet ??
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who can explain why use R30 for attic.
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6 i5 f+ m$ g& f. X4 d5 u7 P  P" `Thanks
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发表于 2010-5-31 20:14 | 显示全部楼层
1# KochFord
9 s& v( I( W0 r; \The higher R value, The better insulation performance.$ {" ]8 b6 [" A1 h) G& j" z6 J
In winter, the hot air always floats up due to thermal buoyancy, so R value for the roof is normally higher than that for exterior wall.
2 [, ~# b. o. {& A8 G8 M3 p' H% Y6 `) `Hope my answer helps.
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发表于 2010-5-31 20:17 | 显示全部楼层
1# KochFord " [3 l% W- @, A9 l: I

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8 G. R" k2 G' I( y, \% ~# CR19 is not commonly used.
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发表于 2010-5-31 21:02 | 显示全部楼层
老杨团队 追求完美
R值固然重要,但隔热材料更重要。即使R值相同,不同的隔热材料性能也是不一样的。
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 楼主| 发表于 2010-6-4 20:08 | 显示全部楼层
谢谢楼上两位
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