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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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4 u* q3 Q- \# d% y7 F3 E: nwho can explain why use R30 for attic.
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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
% Q6 c2 X' j/ u! NThe higher R value, The better insulation performance.
7 P: v1 Y! j, E7 G$ i) o" |; F; L4 xIn 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.
6 a$ x6 H; G! THope 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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& A* }% S. N: f/ h" p/ N" q( HR19 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。
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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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