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

KochFord

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


who can explain why use R30 for attic.

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爱城飞雪

1# KochFord
) ]2 _" M. M5 }+ Z0 \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

1# KochFord
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! T: `2 r, c1 y$ i1 e/ _9 ]R19 is not commonly used.

chic-yong

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

谢谢楼上两位