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 ??
; _( Z+ ^  B) d% x; R0 W5 A0 E

! M/ ?. z0 w* p/ v2 f- @! uwho can explain why use R30 for attic.

6 m7 c- F/ x  [9 R8 xThanks

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
3 j) L- V' X# A4 R# @6 Z7 h. g

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