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 ??

6 M, J- S: C- W# _
! ^/ G7 M* K  H& c; G5 \who can explain why use R30 for attic.

Thanks

爱城飞雪

1# KochFord
2 }5 D9 ^2 C9 A" G, i$ f6 j9 DThe 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.
1 t" ?% }$ A0 O. l; LHope my answer helps.

爱城飞雪

1# KochFord


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