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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 ??* P6 M% m5 t# z% }& e3 a: z

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" J& |; @; v- I& qwho can explain why use R30 for attic. # U) D( _# B5 o5 E( E/ g
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Thanks
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发表于 2010-5-31 20:14 | 显示全部楼层
1# KochFord ; o2 R; s6 m7 Y; r2 u2 T$ g
The higher R value, The better insulation performance.: y+ T& T* n9 d2 M5 r( }( N9 I
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.. _  j* z+ {: P6 ^1 c. l
Hope 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。
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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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