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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 ??
9 m' \7 Z6 _; m
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( R( }; c% r+ N& S/ {' g4 h; s) A  Hwho can explain why use R30 for attic. & P$ F8 S' E. v! Q! Q6 b

1 m4 ~! d: Y+ ]3 _" z/ pThanks
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发表于 2010-5-31 20:14 | 显示全部楼层
1# KochFord
- R2 B( ^% X# }- k7 [( |The higher R value, The better insulation performance.
# A* S. V+ h6 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.
  A5 R5 H5 v- j# b. M6 O9 A& f0 d6 UHope my answer helps.
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发表于 2010-5-31 20:17 | 显示全部楼层
1# KochFord * g/ w: b* h2 H
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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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