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 ??

; K, `- i" o4 H8 `; v( W9 m
/ f5 d7 b* n& V% iwho can explain why use R30 for attic.
) r, h( m) Z1 f1 y* l) {! a
6 @$ W+ U$ i' t, ?Thanks

爱城飞雪

1# KochFord
The higher R value, The better insulation performance.
; m% n5 J( d  u* B- wIn 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.
- U9 B0 q9 s) k, NHope my answer helps.

爱城飞雪

1# KochFord


/ h; a* {8 u/ ^9 h& a" J, B. e3 ?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