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 ??

+ n. w+ ?9 M3 {: n3 F) C- G& a
who can explain why use R30 for attic.
( p! z/ W" T1 T5 ]* J' l. e
$ M7 d" `9 h" T0 i' c$ n& S0 l5 PThanks

爱城飞雪

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

1# KochFord


6 P# }0 t- V- M- C& [) t4 Q6 OR19 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