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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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3 o0 E1 I# P& l  U& x+ T% L! kwho can explain why use R30 for attic.
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Thanks
鲜花(0) 鸡蛋(0)
发表于 2010-5-31 20:14 | 显示全部楼层
1# KochFord 7 v5 w7 r* O. G
The higher R value, The better insulation performance.6 K& K8 y; X6 K' r
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.% n/ r0 P; T$ w+ {0 J9 p4 z0 D3 |
Hope my answer helps.
鲜花(0) 鸡蛋(0)
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.
鲜花(0) 鸡蛋(0)
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。
鲜花(9) 鸡蛋(0)
 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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