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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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5 U6 X( Y9 j7 Z( M+ ?) B$ Mwho can explain why use R30 for attic. - F+ ]; q: C+ H# m( Y* p

! z  g5 w5 S3 j; J' u, }5 uThanks
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发表于 2010-5-31 20:14 | 显示全部楼层
1# KochFord 3 g" ^! \7 @' j' S) @9 U/ ~
The higher R value, The better insulation performance.
* k4 y0 i( ~- bIn 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.
4 `4 F9 `! A; f: [1 wHope my answer helps.
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发表于 2010-5-31 20:17 | 显示全部楼层
1# KochFord
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R19 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。
大型搬家
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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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