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 ??

# ]1 s# T' N8 G% g
who can explain why use R30 for attic.

Thanks

爱城飞雪

1# KochFord
; e' ]2 V5 T8 I5 S: J( A! LThe higher R value, The better insulation performance.
4 e" K" I1 W' h( |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.
2 N8 r6 R- _+ [Hope my answer helps.

爱城飞雪

1# KochFord


1 e0 [- ^! u* B5 m/ g9 P- n7 ER19 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