how much difference between R19 and R20 insulation, need help, thanks

KochFord · 发表于 2010-5-31 14:48

how much difference in price and quality between R19 and R20 per square feet ??

who can explain why use R30 for attic.

Thanks

爱城飞雪 · 发表于 2010-5-31 20:14

1# KochFord
The higher R value, The better insulation performance.
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.
Hope my answer helps.

爱城飞雪 · 发表于 2010-5-31 20:17

1# KochFord

R19 is not commonly used.

chic-yong · 发表于 2010-5-31 21:02

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。

KochFord · 发表于 2010-6-4 20:08

谢谢楼上两位

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